CVE-2022-49256

MEDIUM EPSS 14.9%
Published Feb 26, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
14.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.8  –  <5.10.110
linuxlinux_kernel*≥5.11  –  <5.15.33
linuxlinux_kernel*≥5.16  –  <5.16.19
linuxlinux_kernel*≥5.17  –  <5.17.2

References 5

  • git.kernel.org https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5
    Patch