8.1

CVE-2025-40133: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().

Deferred
AliasesUBUNTU-CVE-2025-40133DEBIAN-CVE-2025-40133
Published 12-11-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-40133 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.8% 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
0.51%
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 12 · Related 10
OPENSUSE-SU-2025:20172-1RHSA-2026:1727RHSA-2026:2282SUSE-SU-2026:20012-1SUSE-SU-2026:20015-1SUSE-SU-2026:20021-1

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable(). mptcp_active_enable() is called from subflow_finish_connect(), which is icsk->icsk_af_ops->sk_rx_dst_set() and it's not always under RCU. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu().

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.48% 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.

Ubuntu103 products
  • linux< 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 27069e7cb3d1cea9377069266acf19b9cc5ad0ae, < ad16235c9d3ef7ec17c109ff39b7504f49d17072 | ≥ 27069e7cb3d1cea9377069266acf19b9cc5ad0ae, < cc976ec9e38bb79409de3261ba1dbb6868e2a53e | ≥ 27069e7cb3d1cea9377069266acf19b9cc5ad0ae, < 893c49a78d9f85e4b8081b908fb7c407d018106a | 6.12

3 vendors · 105 products

References

12 links
Show all 12 references