Review reviewHigh

CVE-2025-21945

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_lock If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine.

CVSS: 7.8
EPSS: 0.49%
CISA KEV: Not listed
Published: 2025.04.02

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.49%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux Linux, linux kernel
Affected versions: >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 410ce35a2ed6d0e114132bba29af49b69880c8c7, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 8573571060ca466cbef2c6f03306b2cc7b883506, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < a0609097fd10d618aed4864038393dd75131289e, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 636e021646cf9b52ddfea7c809b018e91f2188cb, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 84d2d1641b71dec326e8736a749b7ee76a9599fc, >= 5.15, >= 5.15 < 6.1.131, >= 6.2 < 6.6.83, >= 6.7 < 6.12.19, >= 6.13 < 6.13.7, 6.14
Fixed versions: 6.1.131, 6.6.83, 6.12.19, 6.13.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Linux, linux kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416