9.8

CVE-2025-38561: ksmbd: fix Preauh_HashValue race condition

Modified
AliasesUBUNTU-CVE-2025-38561DEBIAN-CVE-2025-38561
Published 19-08-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-38561 is a critical (CVSS 9.8) vulnerability in debian debian_linux. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 38.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.45%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 22 · Related 19
DLA-4328-1MGASA-2025-0234MGASA-2025-0235USN-7879-1USN-7879-2USN-7879-3

Timeline

  1. 19-08-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Preauh_HashValue race condition If client send multiple session setup requests to ksmbd, Preauh_HashValue race condition could happen. There is no need to free sess->Preauh_HashValue at session setup phase. It can be freed together with session at connection termination phase.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.43% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu135 products
  • linux< 5.15.0-168.178 | < 6.8.0-94.96
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1099.106 | < 6.8.0-1045.47
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.148-1 | < 6.12.43-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < fbf5c0845ed15122a770bca9be1d9b60b470d3aa | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < b69fd87076daa66f3d186bd421a7b0ee0cb45829 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < edeecc7871e8fc0878d53ce286c75040a0e38f6c | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 6613887da1d18dd2ecfd6c6148a873c4d903ebdc | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6 | 5.15
  • linux_kernel≥ 5.15, < 6.1.148 | ≥ 6.2, < 6.6.102 | ≥ 6.7, < 6.12.42 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1

3 vendors · 139 products

References

31 links
Show all 31 references