CVE-2025-21955

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 36/100
Published: 2025-04-01 Modified: 2026-10-30 First seen: 2026-10-30 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: None
A: High

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent connection release during oplock break notification ksmbd_work could be freed when after connection release. Increment r_count of ksmbd_conn to indicate that requests are not finished yet and to not release the connection.

Affected Software (13)

VendorProductVersion
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf < 8e6508c7ecb1802909f294827eff38f301d0c937
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf < 09aeab68033161cb54f194da93e51a11aee6144b
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf < a4261bbc33fbf99b99c80aa3a2c5097611802980
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf < f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf < 3aa660c059240e0c795217182cf7df32909dd917
Linux Linux 5.15
linux linux_kernel 5.15 – 6.6.84
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14

Bug Bounty Relevance

36 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

5.5 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.51%
Raw Score 0.005050
Percentile 43.2%
Date 2026-11-01

EPSS Trend

2026-11-01
0.00505
2026-10-31
0.00505
2026-10-30
0.00505
2026-10-29
0.00505

Intelligence Sources

mitre ref →
nvd ref →