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Review reviewHigh

CVE-2025-21967

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_free_work_struct ->interim_entry of ksmbd_work could be deleted after oplock is freed. We don't need to manage it with linked list. The interim request could be immediately sent whenever a oplock break wait is needed.

CVSS
7.8
EPSS
0.35%
28.0% percentile
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 probability0.35%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_free_work_struct ->interim_entry of ksmbd_work could be deleted after oplock is freed. We don't need to manage it with linked list. The interim request could be immediately sent whenever a oplock break wait is needed.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 0626e6641f6b467447c81dd7678a69c66f7746cf < fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 62746ae3f5414244a96293e3b017be637b641280, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < eb51f6f59d19b92f6fe84d3873f958495ab32f0a, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < bb39ed47065455604729404729d9116868638d31, >= 5.15, >= 5.15 < 6.6.84, >= 6.7 < 6.12.20, >= 6.13 < 6.13.8, 6.14
Fixed versions
6.6.84, 6.12.20, 6.13.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 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