CVE-2025-21812 (GCVE-0-2025-21812)
Vulnerability from cvelistv5
Published
2025-02-27 20:01
Modified
2026-05-23 15:57
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: ax25: rcu protect dev->ax25_ptr syzbot found a lockdep issue [1]. We should remove ax25 RTNL dependency in ax25_setsockopt() This should also fix a variety of possible UAF in ax25. [1] WARNING: possible circular locking dependency detected 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Not tainted ------------------------------------------------------ syz.5.1818/12806 is trying to acquire lock: ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}, at: ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680 but task is already holding lock: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline] ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_AX25){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 lock_sock_nested+0x48/0x100 net/core/sock.c:3642 lock_sock include/net/sock.h:1618 [inline] ax25_kill_by_device net/ax25/af_ax25.c:101 [inline] ax25_device_event+0x24d/0x580 net/ax25/af_ax25.c:146 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 __dev_notify_flags+0x207/0x400 dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026 dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:563 dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:820 sock_do_ioctl+0x240/0x460 net/socket.c:1234 sock_ioctl+0x626/0x8e0 net/socket.c:1339 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (rtnl_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680 do_sock_setsockopt+0x3af/0x720 net/socket.c:2324 __sys_setsockopt net/socket.c:2349 [inline] __do_sys_setsockopt net/socket.c:2355 [inline] __se_sys_setsockopt net/socket.c:2352 [inline] __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2352 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_AX25); lock(rtnl_mutex); lock(sk_lock-AF_AX25); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz.5.1818/12806: #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline] #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574 stack backtrace: CPU: 1 UID: 0 PID: 12806 Comm: syz.5.1818 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/lockin ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: c433570458e49bccea5c551df628d058b3526289
Version: c433570458e49bccea5c551df628d058b3526289
Version: c433570458e49bccea5c551df628d058b3526289
Version: c433570458e49bccea5c551df628d058b3526289
Version: c433570458e49bccea5c551df628d058b3526289
Version: 7f93d703e276311dd289c9a520ce9e8c8fa2858c
Version: c0e93a6d36135d5082cb3af8352f5b69c9f58d6e
Version: c39b8fd4997bf99503b8e48d8cb0eedb1d9a54f0
Version: 26a5adc8eb26d170058645c3cccd4d19165bec16
Version: 3e881d8764ed9b04ae3e5c3e5d132acb75ef91ba
Version: 77768c96dcf860c43b970b87b2a09229f84ea560
Version: 3.18.132   ≤
Version: 4.4.170   ≤
Version: 4.9.149   ≤
Version: 4.14.92   ≤
Version: 4.19.14   ≤
Version: 4.20.1   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21812",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-03-04T18:00:00.916644Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-04T18:07:17.248Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:59:48.635Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "include/net/ax25.h",
            "net/ax25/af_ax25.c",
            "net/ax25/ax25_dev.c",
            "net/ax25/ax25_ip.c",
            "net/ax25/ax25_out.c",
            "net/ax25/ax25_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2802ed4ced27ebd474828fc67ffd7d66f11e3605",
              "status": "affected",
              "version": "c433570458e49bccea5c551df628d058b3526289",
              "versionType": "git"
            },
            {
              "lessThan": "7705d8a7f2c26c80973c81093db07c6022b2b30e",
              "status": "affected",
              "version": "c433570458e49bccea5c551df628d058b3526289",
              "versionType": "git"
            },
            {
              "lessThan": "8937f5e38a218531dce2a89fae60e3adcc2311e1",
              "status": "affected",
              "version": "c433570458e49bccea5c551df628d058b3526289",
              "versionType": "git"
            },
            {
              "lessThan": "c2531db6de3c95551be58878f859c6a053b7eb2e",
              "status": "affected",
              "version": "c433570458e49bccea5c551df628d058b3526289",
              "versionType": "git"
            },
            {
              "lessThan": "95fc45d1dea8e1253f8ec58abc5befb71553d666",
              "status": "affected",
              "version": "c433570458e49bccea5c551df628d058b3526289",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7f93d703e276311dd289c9a520ce9e8c8fa2858c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c0e93a6d36135d5082cb3af8352f5b69c9f58d6e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c39b8fd4997bf99503b8e48d8cb0eedb1d9a54f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26a5adc8eb26d170058645c3cccd4d19165bec16",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3e881d8764ed9b04ae3e5c3e5d132acb75ef91ba",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "77768c96dcf860c43b970b87b2a09229f84ea560",
              "versionType": "git"
            },
            {
              "lessThan": "3.19",
              "status": "affected",
              "version": "3.18.132",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.170",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.149",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.92",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.14",
              "versionType": "semver"
            },
            {
              "lessThan": "4.21",
              "status": "affected",
              "version": "4.20.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netdevice.h",
            "include/net/ax25.h",
            "net/ax25/af_ax25.c",
            "net/ax25/ax25_dev.c",
            "net/ax25/ax25_ip.c",
            "net/ax25/ax25_out.c",
            "net/ax25/ax25_route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.129",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.76",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.129",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.76",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.13",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.18.132",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.4.170",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.9.149",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.92",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.20.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: rcu protect dev-\u003eax25_ptr\n\nsyzbot found a lockdep issue [1].\n\nWe should remove ax25 RTNL dependency in ax25_setsockopt()\n\nThis should also fix a variety of possible UAF in ax25.\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 Not tainted\n------------------------------------------------------\nsyz.5.1818/12806 is trying to acquire lock:\n ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}, at: ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n\nbut task is already holding lock:\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #1 (sk_lock-AF_AX25){+.+.}-{0:0}:\n        lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3642\n        lock_sock include/net/sock.h:1618 [inline]\n        ax25_kill_by_device net/ax25/af_ax25.c:101 [inline]\n        ax25_device_event+0x24d/0x580 net/ax25/af_ax25.c:146\n        notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85\n       __dev_notify_flags+0x207/0x400\n        dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026\n        dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:563\n        dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:820\n        sock_do_ioctl+0x240/0x460 net/socket.c:1234\n        sock_ioctl+0x626/0x8e0 net/socket.c:1339\n        vfs_ioctl fs/ioctl.c:51 [inline]\n        __do_sys_ioctl fs/ioctl.c:906 [inline]\n        __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892\n        do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n        do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n       entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n-\u003e #0 (rtnl_mutex){+.+.}-{4:4}:\n        check_prev_add kernel/locking/lockdep.c:3161 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3280 [inline]\n        validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904\n        __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226\n        lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n        __mutex_lock_common kernel/locking/mutex.c:585 [inline]\n        __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735\n        ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680\n        do_sock_setsockopt+0x3af/0x720 net/socket.c:2324\n        __sys_setsockopt net/socket.c:2349 [inline]\n        __do_sys_setsockopt net/socket.c:2355 [inline]\n        __se_sys_setsockopt net/socket.c:2352 [inline]\n        __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2352\n        do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n        do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n       entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_AX25);\n                               lock(rtnl_mutex);\n                               lock(sk_lock-AF_AX25);\n  lock(rtnl_mutex);\n\n *** DEADLOCK ***\n\n1 lock held by syz.5.1818/12806:\n  #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1618 [inline]\n  #0: ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 12806 Comm: syz.5.1818 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n \u003cTASK\u003e\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n  print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074\n  check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206\n  check_prev_add kernel/locking/lockdep.c:3161 [inline]\n  check_prevs_add kernel/lockin\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:57:13.087Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2802ed4ced27ebd474828fc67ffd7d66f11e3605"
        },
        {
          "url": "https://git.kernel.org/stable/c/7705d8a7f2c26c80973c81093db07c6022b2b30e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8937f5e38a218531dce2a89fae60e3adcc2311e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2531db6de3c95551be58878f859c6a053b7eb2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/95fc45d1dea8e1253f8ec58abc5befb71553d666"
        }
      ],
      "title": "ax25: rcu protect dev-\u003eax25_ptr",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21812",
    "datePublished": "2025-02-27T20:01:02.837Z",
    "dateReserved": "2024-12-29T08:45:45.774Z",
    "dateUpdated": "2026-05-23T15:57:13.087Z",
    "state": "PUBLISHED"
  },
  "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.