8.1

CVE-2025-40135: ipv6: use RCU in ip6_xmit()

Deferred
AliasesUBUNTU-CVE-2025-40135DEBIAN-CVE-2025-40135
Published 12-11-2025Last modified 30-10-2026

Vulnerability summary

CVE-2025-40135 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 53.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · +0.16 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 45 · Related 33
OPENSUSE-SU-2025:20172-1RHSA-2026:1690RHSA-2026:2212RHSA-2026:2264RHSA-2026:22964RHSA-2026:23237

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: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

Increase +0.16 pp

From 0.55% 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.

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 6.8.0-136.136 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.17.6-1
Linux1 product
  • linux≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 7a228cfbb66cca49e9baf901c506364f8dfe036b | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < f0a54d00d2f36de40266f47c27989853e8588656 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < f69fec6287565fdeb61f65e700a1184352306943 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < bd0905e2122e3680968cd0741966983490bf2ed3 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < f7f9e924f23684b4b23cd9f976cceab24a968e34 | ≥ 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36, < 9085e56501d93af9f2d7bd16f7fcfacdde47b99c | 4.13

3 vendors · 155 products

References

34 links
Show all 34 references