7.8

CVE-2025-40139: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40139DEBIAN-CVE-2025-40139
Published 12-11-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-40139 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 31 · Related 31
OPENSUSE-SU-2025:20172-1SUSE-SU-2025:4393-1SUSE-SU-2025:4422-1SUSE-SU-2025:4505-1SUSE-SU-2025:4516-1SUSE-SU-2025:4517-1

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set(). smc_clc_prfx_set() is called during connect() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock() after kernel_getsockname(). Note that the returned value of smc_clc_prfx_set() is not used in the caller. While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu() not to touch dst there.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.01 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu155 products
  • linuxAll versions (No fix recorded) | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.111-1 | < 6.17.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ a046d57da19f812216f393e7c535f5858f793ac3, < 5a2fccc4b32c13ddde3676f9e15e1a9baa7d6fde | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 80d1fd39f4e37d836655e9f7ffccaf78925049bf | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 956c57daba55cf9ed25d9f2512883b8a1a927599 | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 0736993bfe5c7a9c744ae3fac62d769dfdae54e1 | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 935d783e5de9b64587f3adb25641dd8385e64ddb | 4.11

3 vendors · 158 products

References

16 links
Show all 16 references