8.8

CVE-2025-37899: linux Use After Free

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2025-37899DEBIAN-CVE-2025-37899
Published 20-05-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2025-37899 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.4% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.88%
0%100%
Low · -0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference

Advisory lineage

Upstream 0 · Downstream 18 · Related 17
DLA-4436-1USN-7649-1USN-7649-2USN-7650-1USN-7665-1USN-7665-2

Timeline

  1. 20-05-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

-0.09 pp

From 0.97% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.88%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (sean.heelan.io)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (news.ycombinator.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Ubuntu133 products
  • linuxAll versions (No fix recorded) | < 6.8.0-101.101
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1047.50
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 931dc8a3670f71c45c0b1379ea4e92dafbda1aca | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 70ad6455139e26e85f48f95d0e21f351c1909342 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < d5ec1d79509b3ee01de02c236f096bc050221b7f | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 02d16046cd11a5c037b28c12ffb818c56dd3ef43 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 2fc9feff45d92a92cd5f96487655d5be23fb7e2b | 5.15
  • linux_kernel≥ 5.15, < 6.12.28 | ≥ 6.13, < 6.14.6 | 6.15:rc1 | 6.15:rc2 | 6.15:rc3 | 6.15:rc4
Debian1 product
  • linux< 6.1.159-1 | < 6.12.29-1

3 vendors · 136 products

References

28 links
Show all 28 references