01 Record

CVE-2025-21967

ksmbd: fix use-after-free in ksmbd_free_work_struct

HighPUBLISHEDCNA: Linux

CNA base score8.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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02 Description

ksmbd: fix use-after-free in ksmbd_free_work_struct

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 32.3% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-07-30.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-04-01 15:47Z1 YR AGO

Last updated

2026-08-05 11:55Z2 MO AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

001ceb083cd6c4aa77380cbbed2dea1d87b31ee8fb53c83ffe25f979d263ad2a

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux0626e6641f6b467447c81dd7678a69c66f7746cf to < fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3, 0626e6641f6b467447c81dd7678a69c66f7746cf to < 62746ae3f5414244a96293e3b017be637b641280, 0626e6641f6b467447c81dd7678a69c66f7746cf to < eb51f6f59d19b92f6fe84d3873f958495ab32f0a, 0626e6641f6b467447c81dd7678a69c66f7746cf to < bb39ed47065455604729404729d9116868638d31, 5.15—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3
git.kernel.orghttps://git.kernel.org/stable/c/62746ae3f5414244a96293e3b017be637b641280
git.kernel.orghttps://git.kernel.org/stable/c/eb51f6f59d19b92f6fe84d3873f958495ab32f0a
git.kernel.orghttps://git.kernel.org/stable/c/bb39ed47065455604729404729d9116868638d31

07 Fixed in

Debian 12

linux
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.20-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.12.20-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.