ghsa-wx4p-gp87-7m52
Vulnerability from github
Published
2025-09-22 21:30
Modified
2025-09-22 21:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

watch_queue: Actually free the watch

free_watch() does everything barring actually freeing the watch object. Fix this by adding the missing kfree.

kmemleak produces a report something like the following. Note that as an address can be seen in the first word, the watch would appear to have gone through call_rcu().

BUG: memory leak unreferenced object 0xffff88810ce4a200 (size 96): comm "syz-executor352", pid 3605, jiffies 4294947473 (age 13.720s) hex dump (first 32 bytes): e0 82 48 0d 81 88 ff ff 00 00 00 00 00 00 00 00 ..H............. 80 a2 e4 0c 81 88 ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [] kmalloc include/linux/slab.h:581 [inline] [] kzalloc include/linux/slab.h:714 [inline] [] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800 [] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x44/0xae

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49256"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:02Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: Actually free the watch\n\nfree_watch() does everything barring actually freeing the watch object.  Fix\nthis by adding the missing kfree.\n\nkmemleak produces a report something like the following.  Note that as an\naddress can be seen in the first word, the watch would appear to have gone\nthrough call_rcu().\n\nBUG: memory leak\nunreferenced object 0xffff88810ce4a200 (size 96):\n  comm \"syz-executor352\", pid 3605, jiffies 4294947473 (age 13.720s)\n  hex dump (first 32 bytes):\n    e0 82 48 0d 81 88 ff ff 00 00 00 00 00 00 00 00  ..H.............\n    80 a2 e4 0c 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003cffffffff8214e6cc\u003e] kmalloc include/linux/slab.h:581 [inline]\n    [\u003cffffffff8214e6cc\u003e] kzalloc include/linux/slab.h:714 [inline]\n    [\u003cffffffff8214e6cc\u003e] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800\n    [\u003cffffffff8214ec84\u003e] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016\n    [\u003cffffffff84493a25\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [\u003cffffffff84493a25\u003e] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n    [\u003cffffffff84600068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae",
  "id": "GHSA-wx4p-gp87-7m52",
  "modified": "2025-09-22T21:30:16Z",
  "published": "2025-09-22T21:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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