CVE-2025-38709

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-38709
In the Linux kernel, the following vulnerability has been resolved: loop: Avoid updating block size under exclusive owner Syzbot came up with a reproducer where a loop device block size is changed underneath a mounted filesystem. This causes a mismatch between the block device block size and the block size stored in the superblock causing confusion in various places such as fs/buffer.c. The particular issue triggered by syzbot was a warning in __getblk_slow() due to requested buffer size not matching block device block size. Fix the problem by getting exclusive hold of the loop device to change its block size. This fails if somebody (such as filesystem) has already an exclusive ownership of the block device and thus prevents modifying the loop device under some exclusive owner which doesn't expect it.

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

References
Link Resource
https://git.kernel.org/stable/c/139a000d20f2f38ce34296feddd641d730fe1c08 Patch
https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d Patch
https://git.kernel.org/stable/c/5d67b30aefeb7a949040bbb1b4e3b84c5d29a624 Patch
https://git.kernel.org/stable/c/7e49538288e523427beedd26993d446afef1a6fb Patch
https://git.kernel.org/stable/c/b928438cc87c0bf7ae078e4b7b6e14261e84c5c5 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

03 Dec 2025, 20:00

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/139a000d20f2f38ce34296feddd641d730fe1c08 - () https://git.kernel.org/stable/c/139a000d20f2f38ce34296feddd641d730fe1c08 - Patch
References () https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d - () https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d - Patch
References () https://git.kernel.org/stable/c/5d67b30aefeb7a949040bbb1b4e3b84c5d29a624 - () https://git.kernel.org/stable/c/5d67b30aefeb7a949040bbb1b4e3b84c5d29a624 - Patch
References () https://git.kernel.org/stable/c/7e49538288e523427beedd26993d446afef1a6fb - () https://git.kernel.org/stable/c/7e49538288e523427beedd26993d446afef1a6fb - Patch
References () https://git.kernel.org/stable/c/b928438cc87c0bf7ae078e4b7b6e14261e84c5c5 - () https://git.kernel.org/stable/c/b928438cc87c0bf7ae078e4b7b6e14261e84c5c5 - Patch

02 Oct 2025, 14:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d -

25 Sep 2025, 10:15

Type Values Removed Values Added
References
  • {'url': 'https://git.kernel.org/stable/c/ce8da5d13d8c2a7b30b2fb376a22e8eb1a70b8bb', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}

04 Sep 2025, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-09-04 16:15

Updated : 2025-12-03 20:00

NVD link : CVE-2025-38709

Mitre link : CVE-2025-38709

CVE.ORG link : CVE-2025-38709

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo