8.1

CVE-2025-40168: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

Deferred
AliasesUBUNTU-CVE-2025-40168DEBIAN-CVE-2025-40168
Published 12-11-2025Last modified 02-09-2026

Vulnerability summary

CVE-2025-40168 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 36.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.1 (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
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.42%
0%100%
Low · +0.03 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 32 · Related 22
OPENSUSE-SU-2025:20172-1RHSA-2026:2720RHSA-2026:27708RHSA-2026:2821RHSA-2026:3275RHSA-2026:3488

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 02-09-2026
    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 smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the returned value of smc_clc_prfx_match() is not used in the caller.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.39% 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

No weakness data has been published for this record.

Affected systems

Version check

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

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, < 3f119c37aa293af41400cccb3d89fab8dcf774b0 | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 4f5f52a5842937f945582a93cb9daed9ea526fee | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 326e5cf301d0bec0a672aa834d8254c4f9df6255 | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < d26e80f7fb62d77757b67a1b94e4ac756bc9c658 | ≥ a046d57da19f812216f393e7c535f5858f793ac3, < 235f81045c008169cc4e1955b4a64e118eebe61b | 4.11

3 vendors · 158 products

References

15 links
Show all 15 references