CVE-2022-49256

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  3. CVE-2022-49256

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

I

n 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

References
Link Resource
https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2 Patch
https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7 Patch
https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893 Patch
https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b Patch
https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

22 Sep 2025, 20:55

Type Values Removed Values Added
CWE CWE-401
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: watch_queue: En realidad, libera el reloj. free_watch() hace todo lo posible, excepto liberar realmente el objeto de vigilancia. Solucione esto agregando el kfree faltante. kmemleak produce un informe similar al siguiente. Tenga en cuenta que, como se puede ver una dirección en la primera palabra, el reloj parecería haber pasado por call_rcu(). ERROR: pérdida de memoria objeto no referenciado 0xffff88810ce4a200 (tamaño 96): comm "syz-executor352", pid 3605, jiffies 4294947473 (edad 13.720s) volcado hexadecimal (primeros 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: [] kmalloc include/linux/slab.h:581 [inline] [] kzalloc include/linux/slab.h:714 [inline] [] keyctl_watch_key+0xec/0x2e0 security/keys/keyctl.c:1800 [] __do_sys_keyctl+0x3c4/0x490 security/keys/keyctl.c:2016 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x44/0xae
References () https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2 - () https://git.kernel.org/stable/c/31824613a42aacdcbeb325bf07a1c8247a11ebe2 - Patch
References () https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7 - () https://git.kernel.org/stable/c/3d8dcf278b1ee1eff1e90be848fa2237db4c07a7 - Patch
References () https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893 - () https://git.kernel.org/stable/c/7e8c9b0df07a77f0d072603b8ced2677e30e1893 - Patch
References () https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b - () https://git.kernel.org/stable/c/9d92be1a09fbb3dd65600dbfe7eedb40e7228e4b - Patch
References () https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5 - () https://git.kernel.org/stable/c/f69aecb49968e14196366bbe896eab0a904229f5 - Patch

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-09-22 20:55

NVD link : CVE-2022-49256

Mitre link : CVE-2022-49256

CVE.ORG link : CVE-2022-49256

JSON object : View

Products Affected

linux

CWE
CWE-401

Missing Release of Memory after Effective Lifetime