CVE-2022-49256 (GCVE-0-2022-49256)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:56 – Updated: 2025-05-04 08:33
VLAI?
Title
watch_queue: Actually free the watch
Summary
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: [<ffffffff8214e6cc>] kmalloc include/linux/slab.h:581 [inline] [<ffffffff8214e6cc>] kzalloc include/linux/slab.h:714 [inline] [<ffffffff8214e6cc>] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800 [<ffffffff8214ec84>] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016 [<ffffffff84493a25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff84493a25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < f69aecb49968e14196366bbe896eab0a904229f5 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 7e8c9b0df07a77f0d072603b8ced2677e30e1893 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 31824613a42aacdcbeb325bf07a1c8247a11ebe2 (git)
Affected: c73be61cede5882f9605a852414db559c0ebedfd , < 3d8dcf278b1ee1eff1e90be848fa2237db4c07a7 (git)
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    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/watch_queue.c"
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          "vendor": "Linux",
          "versions": [
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:33:29.888Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893"
        },
        {
          "url": "https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7"
        }
      ],
      "title": "watch_queue: Actually free the watch",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49256",
    "datePublished": "2025-02-26T01:56:10.599Z",
    "dateReserved": "2025-02-26T01:49:39.296Z",
    "dateUpdated": "2025-05-04T08:33:29.888Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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