CVE-2023-53111 (GCVE-0-2023-53111)
Vulnerability from cvelistv5
Published
2025-05-02 15:55
Modified
2026-08-05 09:12
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: loop: Fix use-after-free issues do_req_filebacked() calls blk_mq_complete_request() synchronously or asynchronously when using asynchronous I/O unless memory allocation fails. Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor 'rq' after do_req_filebacked() finished unless we are sure that the request has not yet been completed. This patch fixes the following kernel crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054 Call trace: css_put.42938+0x1c/0x1ac loop_process_work+0xc8c/0xfd4 loop_rootcg_workfn+0x24/0x34 process_one_work+0x244/0x558 worker_thread+0x400/0x8fc kthread+0x16c/0x1e0 ret_from_fork+0x10/0x20
References
Impacted products
Vendor Product Version
Linux Linux Version: bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6
Version: bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6
Version: bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6
Version: bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/loop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "407badf73ec9fb0d5744bf2ca1745c1818aa222f",
              "status": "affected",
              "version": "bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6",
              "versionType": "git"
            },
            {
              "lessThan": "e3fda704903f6d1fc351412f1bc6620333959ada",
              "status": "affected",
              "version": "bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6",
              "versionType": "git"
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            {
              "lessThan": "6917395c4667cfb607ed8bf1826205a59414657c",
              "status": "affected",
              "version": "bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6",
              "versionType": "git"
            },
            {
              "lessThan": "9b0cb770f5d7b1ff40bea7ca385438ee94570eec",
              "status": "affected",
              "version": "bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/loop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.104",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.21",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.8",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Fix use-after-free issues\n\ndo_req_filebacked() calls blk_mq_complete_request() synchronously or\nasynchronously when using asynchronous I/O unless memory allocation fails.\nHence, modify loop_handle_cmd() such that it does not dereference \u0027cmd\u0027 nor\n\u0027rq\u0027 after do_req_filebacked() finished unless we are sure that the request\nhas not yet been completed. This patch fixes the following kernel crash:\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000054\nCall trace:\n css_put.42938+0x1c/0x1ac\n loop_process_work+0xc8c/0xfd4\n loop_rootcg_workfn+0x24/0x34\n process_one_work+0x244/0x558\n worker_thread+0x400/0x8fc\n kthread+0x16c/0x1e0\n ret_from_fork+0x10/0x20"
        }
      ],
      "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 - The bug is in the loop block driver\u2019s I/O completion path (loop_handle_cmd), reached via local block I/O or loop ioctls on /dev/loop*, not by parsing remote network packets.\nAC:L - With LO_FLAGS_DIRECT_IO/AIO, lo_rw_aio can complete and free the request synchronously before do_req_filebacked() returns, so the subsequent cmd dereferences are a reliable UAF the attacker triggers by submitting I/O\u2014no conditions outside attacker control.\nPR:L - LOOP_SET_FD/LOOP_CONFIGURE require no CAP_SYS_ADMIN\u2014only open access to the loop device node\u2014and LO_FLAGS_DIRECT_IO is a LOOP_CONFIGURE_SETTABLE_FLAGS bit; unprivileged users with device access (disk group, containers) or who can perform I/O on an already DIO-backed loop mount can reach the path.\nUI:N - The attacker configures the loop device (or uses an accessible one) and submits reads/writes themselves; no separate victim action is required.\nS:U - Impact is confined to the local kernel\u2019s authority (crash or privilege escalation within the host); it does not cross a VM/IOMMU/sandbox boundary.\nC:H - Use-after-free of the blk-mq request PDU (loop_cmd) lets an attacker reclaim and control freed object contents, enabling information disclosure primitives from the corrupted state.\nI:H - The same UAF can be turned into strong integrity primitives (e.g., css_put on a reclaimed pointer, double completion via corrupted use_aio), supporting arbitrary write / control-flow hijack.\nA:H - The report\u2019s crash (NULL deref in css_put from loop_process_work) shows a kernel oops/panic is readily achievable whenever the freed cmd is accessed."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:50.996Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/407badf73ec9fb0d5744bf2ca1745c1818aa222f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3fda704903f6d1fc351412f1bc6620333959ada"
        },
        {
          "url": "https://git.kernel.org/stable/c/6917395c4667cfb607ed8bf1826205a59414657c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b0cb770f5d7b1ff40bea7ca385438ee94570eec"
        }
      ],
      "title": "loop: Fix use-after-free issues",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53111",
    "datePublished": "2025-05-02T15:55:51.029Z",
    "dateReserved": "2025-05-02T15:51:43.554Z",
    "dateUpdated": "2026-08-05T09:12:50.996Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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