SB2025090458 - Use-after-free in Linux kernel nfs blocklayout
Published: September 4, 2025
Security Bulletin ID
SB2025090458
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-38691)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the ext_tree_encode_commit(), ext_tree_prepare_commit() and dprintk() functions in fs/nfs/blocklayout/extent_tree.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/24334f3cf8a294f253071b5bf22d754dbb6d0f2d
- https://git.kernel.org/stable/c/2896f101110076ac6bf99d7aaf463d61e26f89dd
- https://git.kernel.org/stable/c/37c3443a2685528f972d910a6fb87716b96fef46
- https://git.kernel.org/stable/c/4f783333cbfa2ee7d4aa8e47f6bd1b3f77534fcf
- https://git.kernel.org/stable/c/579b85f893d9885162e1cabf99a4a088916e143e
- https://git.kernel.org/stable/c/94ec6d939031a616474376dadbf4a8d0ef8b0bcc
- https://git.kernel.org/stable/c/9768797c219326699778fba9cd3b607b2f1e7950
- https://git.kernel.org/stable/c/9be5c04beca3202d0a5f09fb4b2ecb644caa0bc5
- https://git.kernel.org/stable/c/f0b2eee3fbba9b7e3746ef698424ef5e4a197776