7.8

CVE-2025-40170: net: use dst_dev_rcu() in sk_setup_caps()

Deferred
AliasesUBUNTU-CVE-2025-40170DEBIAN-CVE-2025-40170
Published 12-11-2025Last modified 30-10-2026

Vulnerability summary

CVE-2025-40170 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 9.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · +0.05 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 33 · Related 20
DSA-6126-1OPENSUSE-SU-2026:20145-1RHSA-2026:1690RHSA-2026:2212RHSA-2026:2264RHSA-2026:22964

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: use dst_dev_rcu() in sk_setup_caps() Use RCU to protect accesses to dst->dev from sk_setup_caps() and sk_dst_gso_max_size(). Also use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(), and ip_dst_mtu_maybe_forward(). ip4_dst_hoplimit() can use dst_dev_net_rcu().

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

Increase +0.05 pp

From 0.15% 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: local access, low-privilege account, 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)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.69-1 | < 6.17.6-1
Linux1 product
  • linux≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 13b0e14bfa7e6d506d8d6426b9e6d7feef01ded3 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < a805729c0091073d8f0415cfa96c7acd1bc17a48 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 99a2ace61b211b0be861b07fbaa062fca4b58879 | 4.13

3 vendors · 157 products

References

14 links
Show all 14 references