{"id":"CVE-2022-49256","title":"watch_queue: Actually free the watch","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b","Linux >= c73be61cede5882f9605a852414db559c0ebedfd < f69aecb49968e14196366bbe896eab0a904229f5","Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 7e8c9b0df07a77f0d072603b8ced2677e30e1893","Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 31824613a42aacdcbeb325bf07a1c8247a11ebe2","Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 3d8dcf278b1ee1eff1e90be848fa2237db4c07a7","Linux 5.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:44:45.180779Z"},"published":"2025-02-26","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:49:37.697Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49256","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"}],"tags":["cve.org"],"epss":0.00261,"epssPercentile":0.17997,"ingestedAt":"2026-11-05T22:38:31.568Z","slug":"CVE-2022-49256","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b`\n- `Linux >= c73be61cede5882f9605a852414db559c0ebedfd < f69aecb49968e14196366bbe896eab0a904229f5`\n- `Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 7e8c9b0df07a77f0d072603b8ced2677e30e1893`\n- `Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 31824613a42aacdcbeb325bf07a1c8247a11ebe2`\n- `Linux >= c73be61cede5882f9605a852414db559c0ebedfd < 3d8dcf278b1ee1eff1e90be848fa2237db4c07a7`\n- `Linux 5.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}