CVE-2023-53747 (GCVE-0-2023-53747)
Vulnerability from cvelistv5
Published
2025-12-08 01:19
Modified
2026-10-15 21:41
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF After a call to console_unlock() in vcs_write() the vc_data struct can be freed by vc_port_destruct(). Because of that, the struct vc_data pointer must be reloaded in the while loop in vcs_write() after console_lock() to avoid a UAF when vcs_size() is called. Syzkaller reported a UAF in vcs_size(). BUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119 Call Trace: <TASK> __asan_report_load4_noabort (mm/kasan/report_generic.c:380) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_write (drivers/tty/vt/vc_screen.c:664) vfs_write (fs/read_write.c:582 fs/read_write.c:564) ... <TASK> Allocated by task 1213: kmalloc_trace (mm/slab_common.c:1064) vc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680 drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058) con_install (drivers/tty/vt/vt.c:3334) tty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415 drivers/tty/tty_io.c:1392) tty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:921) vfs_open (fs/open.c:1052) ... Freed by task 4116: kfree (mm/slab_common.c:1016) vc_port_destruct (drivers/tty/vt/vt.c:1044) tty_port_destructor (drivers/tty/tty_port.c:296) tty_port_put (drivers/tty/tty_port.c:312) vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2)) vt_ioctl (drivers/tty/vt/vt_ioctl.c:903) tty_ioctl (drivers/tty/tty_io.c:2778) ... The buggy address belongs to the object at ffff8880beab8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 424 bytes inside of freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00) The buggy address belongs to the physical page: page:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbeab8 head:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Disabling lock debugging due to kernel taint
References
Impacted products
Vendor Product Version
Linux Linux Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
Version: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-53747",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:36:57.834897Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T21:41:35.219Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/vt/vc_screen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "934de9a9b659785fed3e820bc0c813a460c71fea",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "0deff678157333d775af190f84696336cdcccd6d",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "a4e3c4c65ae8510e01352c9a4347e05c035b2ce2",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "11dddfbb7a4e62489b01074d6c04d9d1b42e4047",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "3338d0b9acde770ee588eead5cac32c25e7048fc",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "1de42e7653d6714a7507ba6696151a1fa028c69f",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            },
            {
              "lessThan": "8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357",
              "status": "affected",
              "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/vt/vc_screen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.38"
            },
            {
              "lessThan": "2.6.38",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.327",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.284",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.244",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.327",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.284",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.244",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.181",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.113",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.30",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.4",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "2.6.38",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF\n\nAfter a call to console_unlock() in vcs_write() the vc_data struct can be\nfreed by vc_port_destruct(). Because of that, the struct vc_data pointer\nmust be reloaded in the while loop in vcs_write() after console_lock() to\navoid a UAF when vcs_size() is called.\n\nSyzkaller reported a UAF in vcs_size().\n\nBUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\nRead of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119\n\nCall Trace:\n \u003cTASK\u003e\n__asan_report_load4_noabort (mm/kasan/report_generic.c:380)\nvcs_size (drivers/tty/vt/vc_screen.c:215)\nvcs_write (drivers/tty/vt/vc_screen.c:664)\nvfs_write (fs/read_write.c:582 fs/read_write.c:564)\n...\n \u003cTASK\u003e\n\nAllocated by task 1213:\nkmalloc_trace (mm/slab_common.c:1064)\nvc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680\n    drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058)\ncon_install (drivers/tty/vt/vt.c:3334)\ntty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415\n    drivers/tty/tty_io.c:1392)\ntty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128)\nchrdev_open (fs/char_dev.c:415)\ndo_dentry_open (fs/open.c:921)\nvfs_open (fs/open.c:1052)\n...\n\nFreed by task 4116:\nkfree (mm/slab_common.c:1016)\nvc_port_destruct (drivers/tty/vt/vt.c:1044)\ntty_port_destructor (drivers/tty/tty_port.c:296)\ntty_port_put (drivers/tty/tty_port.c:312)\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\ntty_ioctl (drivers/tty/tty_io.c:2778)\n...\n\nThe buggy address belongs to the object at ffff8880beab8800\n which belongs to the cache kmalloc-1k of size 1024\nThe buggy address is located 424 bytes inside of\n freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00)\n\nThe buggy address belongs to the physical page:\npage:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000\n    index:0x0 pfn:0xbeab8\nhead:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0\n    pincount:0\nflags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff)\npage_type: 0xffffffff()\nraw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\u003effff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                  ^\n ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\nDisabling lock debugging due to kernel taint"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local access to character device nodes \u2014 write(2) on /dev/vcsN or /dev/vcsaN and an ioctl on a VT tty for VT_DISALLOCATE. There is no network or remote-peer reachability.\nAC:L - The attacker controls both sides of the race: one thread drives the write loop (which unconditionally drops console_lock every PAGE_SIZE chunk) while another calls VT_DISALLOCATE, and the window can be stretched indefinitely by backing the user buffer with userfaultfd or FUSE so copy_from_user stalls on demand. This makes the free-and-respray step reliable rather than opportunistic.\nPR:L - VT_DISALLOCATE carries no perm or capable() check whatsoever in vt_ioctl, so the only gate is DAC on /dev/vcs* and a VT fd \u2014 held by any tty-group member, any console-logged-in user via logind ACLs, or non-root console services on embedded systems. No capability or root privilege in the initial namespace is needed.\nUI:N - The attacker performs every step \u2014 allocating the VT, opening /dev/vcs*, issuing the write and the deallocation ioctl \u2014 from its own threads. No victim action is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale vc_data is read after free (vcs_size, screenpos, vc_sw), and since the attacker can reclaim the kmalloc-1k slot with controlled data and set vc-\u003evc_origin arbitrarily, the write path\u0027s read-modify-write sequences (vcs_scr_readw on the computed pointer) yield an arbitrary kernel-memory read primitive.\nI:H - vcs_write_buf derives its destination pointer from the freed object\u0027s vc_origin/vc_visible_origin and then writes attacker-supplied 16-bit values there, giving a controlled arbitrary kernel write; the viewed path additionally makes an indirect call through vc-\u003evc_sw-\u003econ_screen_pos read out of freed memory, a direct control-flow hijack primitive leading to privilege escalation.\nA:H - Even unweaponized the bug is a slab use-after-free that reads and writes through a dangling pointer, producing KASAN splats, oopses, and kernel panics as syzkaller demonstrated, and it can be retriggered at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:45.787Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/934de9a9b659785fed3e820bc0c813a460c71fea"
        },
        {
          "url": "https://git.kernel.org/stable/c/0deff678157333d775af190f84696336cdcccd6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4e3c4c65ae8510e01352c9a4347e05c035b2ce2"
        },
        {
          "url": "https://git.kernel.org/stable/c/11dddfbb7a4e62489b01074d6c04d9d1b42e4047"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67"
        },
        {
          "url": "https://git.kernel.org/stable/c/3338d0b9acde770ee588eead5cac32c25e7048fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/1de42e7653d6714a7507ba6696151a1fa028c69f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357"
        }
      ],
      "title": "vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53747",
    "datePublished": "2025-12-08T01:19:06.255Z",
    "dateReserved": "2025-12-08T01:18:04.279Z",
    "dateUpdated": "2026-10-15T21:41:35.219Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53747\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-15T21:36:57.834897Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-15T21:36:58.317Z\"}}], \"cna\": {\"title\": \"vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - Exploitation requires local access to character device nodes \\u2014 write(2) on /dev/vcsN or /dev/vcsaN and an ioctl on a VT tty for VT_DISALLOCATE. There is no network or remote-peer reachability.\\nAC:L - The attacker controls both sides of the race: one thread drives the write loop (which unconditionally drops console_lock every PAGE_SIZE chunk) while another calls VT_DISALLOCATE, and the window can be stretched indefinitely by backing the user buffer with userfaultfd or FUSE so copy_from_user stalls on demand. This makes the free-and-respray step reliable rather than opportunistic.\\nPR:L - VT_DISALLOCATE carries no perm or capable() check whatsoever in vt_ioctl, so the only gate is DAC on /dev/vcs* and a VT fd \\u2014 held by any tty-group member, any console-logged-in user via logind ACLs, or non-root console services on embedded systems. No capability or root privilege in the initial namespace is needed.\\nUI:N - The attacker performs every step \\u2014 allocating the VT, opening /dev/vcs*, issuing the write and the deallocation ioctl \\u2014 from its own threads. No victim action is involved.\\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The stale vc_data is read after free (vcs_size, screenpos, vc_sw), and since the attacker can reclaim the kmalloc-1k slot with controlled data and set vc-\u003evc_origin arbitrarily, the write path\u0027s read-modify-write sequences (vcs_scr_readw on the computed pointer) yield an arbitrary kernel-memory read primitive.\\nI:H - vcs_write_buf derives its destination pointer from the freed object\u0027s vc_origin/vc_visible_origin and then writes attacker-supplied 16-bit values there, giving a controlled arbitrary kernel write; the viewed path additionally makes an indirect call through vc-\u003evc_sw-\u003econ_screen_pos read out of freed memory, a direct control-flow hijack primitive leading to privilege escalation.\\nA:H - Even unweaponized the bug is a slab use-after-free that reads and writes through a dangling pointer, producing KASAN splats, oopses, and kernel panics as syzkaller demonstrated, and it can be retriggered at will.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"934de9a9b659785fed3e820bc0c813a460c71fea\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"0deff678157333d775af190f84696336cdcccd6d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"a4e3c4c65ae8510e01352c9a4347e05c035b2ce2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"11dddfbb7a4e62489b01074d6c04d9d1b42e4047\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"3338d0b9acde770ee588eead5cac32c25e7048fc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"1de42e7653d6714a7507ba6696151a1fa028c69f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.38\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.38\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.327\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.284\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.244\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.181\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.30\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.3.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/934de9a9b659785fed3e820bc0c813a460c71fea\"}, {\"url\": \"https://git.kernel.org/stable/c/0deff678157333d775af190f84696336cdcccd6d\"}, {\"url\": \"https://git.kernel.org/stable/c/a4e3c4c65ae8510e01352c9a4347e05c035b2ce2\"}, {\"url\": \"https://git.kernel.org/stable/c/11dddfbb7a4e62489b01074d6c04d9d1b42e4047\"}, {\"url\": \"https://git.kernel.org/stable/c/e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67\"}, {\"url\": \"https://git.kernel.org/stable/c/3338d0b9acde770ee588eead5cac32c25e7048fc\"}, {\"url\": \"https://git.kernel.org/stable/c/1de42e7653d6714a7507ba6696151a1fa028c69f\"}, {\"url\": \"https://git.kernel.org/stable/c/8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF\\n\\nAfter a call to console_unlock() in vcs_write() the vc_data struct can be\\nfreed by vc_port_destruct(). Because of that, the struct vc_data pointer\\nmust be reloaded in the while loop in vcs_write() after console_lock() to\\navoid a UAF when vcs_size() is called.\\n\\nSyzkaller reported a UAF in vcs_size().\\n\\nBUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\\nRead of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119\\n\\nCall Trace:\\n \u003cTASK\u003e\\n__asan_report_load4_noabort (mm/kasan/report_generic.c:380)\\nvcs_size (drivers/tty/vt/vc_screen.c:215)\\nvcs_write (drivers/tty/vt/vc_screen.c:664)\\nvfs_write (fs/read_write.c:582 fs/read_write.c:564)\\n...\\n \u003cTASK\u003e\\n\\nAllocated by task 1213:\\nkmalloc_trace (mm/slab_common.c:1064)\\nvc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680\\n    drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058)\\ncon_install (drivers/tty/vt/vt.c:3334)\\ntty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415\\n    drivers/tty/tty_io.c:1392)\\ntty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128)\\nchrdev_open (fs/char_dev.c:415)\\ndo_dentry_open (fs/open.c:921)\\nvfs_open (fs/open.c:1052)\\n...\\n\\nFreed by task 4116:\\nkfree (mm/slab_common.c:1016)\\nvc_port_destruct (drivers/tty/vt/vt.c:1044)\\ntty_port_destructor (drivers/tty/tty_port.c:296)\\ntty_port_put (drivers/tty/tty_port.c:312)\\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\\ntty_ioctl (drivers/tty/tty_io.c:2778)\\n...\\n\\nThe buggy address belongs to the object at ffff8880beab8800\\n which belongs to the cache kmalloc-1k of size 1024\\nThe buggy address is located 424 bytes inside of\\n freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00)\\n\\nThe buggy address belongs to the physical page:\\npage:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000\\n    index:0x0 pfn:0xbeab8\\nhead:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0\\n    pincount:0\\nflags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff)\\npage_type: 0xffffffff()\\nraw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002\\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\n\\nMemory state around the buggy address:\\n ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\u003effff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n                                  ^\\n ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n==================================================================\\nDisabling lock debugging due to kernel taint\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.327\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.284\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.244\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.181\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.113\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.30\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.4\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4\", \"versionStartIncluding\": \"2.6.38\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:15:45.787Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53747\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:41:35.219Z\", \"dateReserved\": \"2025-12-08T01:18:04.279Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-08T01:19:06.255Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.