CVE-2022-49256
watch_queue: Actually free the watch
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected c73be61cede5882f9605a852414db559c0ebedfd – < 9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b
- affected c73be61cede5882f9605a852414db559c0ebedfd – < f69aecb49968e14196366bbe896eab0a904229f5
- affected c73be61cede5882f9605a852414db559c0ebedfd – < 7e8c9b0df07a77f0d072603b8ced2677e30e1893
- affected c73be61cede5882f9605a852414db559c0ebedfd – < 31824613a42aacdcbeb325bf07a1c8247a11ebe2
- affected c73be61cede5882f9605a852414db559c0ebedfd – < 3d8dcf278b1ee1eff1e90be848fa2237db4c07a7
- affected 5.8
- unaffected < 5.8
- unaffected 5.10.110 – ≤ 5.10.*
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (5)
- https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b (opens in a new tab)
- https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5 (opens in a new tab)
- https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893 (opens in a new tab)
- https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2 (opens in a new tab)
- https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49256)Record last updated .