{"api_version":"1","generated_at":"2026-11-06T15:57:39+00:00","cve":"CVE-2022-49256","urls":{"html":"https://cve.report/CVE-2022-49256","api":"https://cve.report/api/cve/CVE-2022-49256.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-49256","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-49256"},"summary":{"title":"watch_queue: Actually free the watch","description":"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    [<ffffffff8214e6cc>] kmalloc include/linux/slab.h:581 [inline]\n    [<ffffffff8214e6cc>] kzalloc include/linux/slab.h:714 [inline]\n    [<ffffffff8214e6cc>] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800\n    [<ffffffff8214ec84>] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016\n    [<ffffffff84493a25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [<ffffffff84493a25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n    [<ffffffff84600068>] 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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    [<ffffffff8214e6cc>] kmalloc include/linux/slab.h:581 [inline]\n    [<ffffffff8214e6cc>] kzalloc include/linux/slab.h:714 [inline]\n    [<ffffffff8214e6cc>] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800\n    [<ffffffff8214ec84>] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016\n    [<ffffffff84493a25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [<ffffffff84493a25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae"}],"providerMetadata":{"dateUpdated":"2026-05-11T18:56:11.419Z","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","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"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":"2026-11-05T19:49:37.697Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-02-26 07:01:02","lastModifiedDate":"2026-11-05 20:17:02","problem_types":["CWE-401"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-05T19:44:45.180779Z","id":"CVE-2022-49256","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.10.110","matchCriteriaId":"552AD555-63DB-4D57-BBAA-86EA26658508"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.33","matchCriteriaId":"27C42AE8-B387-43E2-938A-E1C8B40BE6D5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.16.19","matchCriteriaId":"20C43679-0439-405A-B97F-685BEE50613B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"5.17.2","matchCriteriaId":"210C679C-CF84-44A3-8939-E629C87E54BF"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"49256","Ordinal":"1","Title":"watch_queue: Actually free the watch","CVE":"CVE-2022-49256","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"49256","Ordinal":"1","NoteData":"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    [<ffffffff8214e6cc>] kmalloc include/linux/slab.h:581 [inline]\n    [<ffffffff8214e6cc>] kzalloc include/linux/slab.h:714 [inline]\n    [<ffffffff8214e6cc>] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800\n    [<ffffffff8214ec84>] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016\n    [<ffffffff84493a25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [<ffffffff84493a25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae","Type":"Description","Title":"watch_queue: Actually free the watch"}]}}}