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  4. CVE 2025 40170 net use dstdevrcu in sksetupcaps
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Back to active CVEs
High · CVSS 7.8CVE-2025-40170

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

Answer in brief

CVE-2025-40170 records a High severity (CVSS 7.8) vulnerability in net: use dst_dev_rcu() in sk_setup_caps(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 12, 2025Updated Oct 30, 2026Source checked Nov 6, 2026First seen by HOL Aug 5, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <5d1be493d1110c9e720b4c51a6e587bb2fb4ac12 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <a805729c0091073d8f0415cfa96c7acd1bc17a48 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <99a2ace61b211b0be861b07fbaa062fca4b588795d1be493d1110c9e720b4c51a6e587bb2fb4ac12, a805729c0091073d8f0415cfa96c7acd1bc17a48, 99a2ace61b211b0be861b07fbaa062fca4b58879
Linux/Linuxgeneric4.13Not reported
Linux/Linuxgeneric>=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <5d1be493d1110c9e720b4c51a6e587bb2fb4ac12 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <a805729c0091073d8f0415cfa96c7acd1bc17a48 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <99a2ace61b211b0be861b07fbaa062fca4b588799f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02, 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12, a805729c0091073d8f0415cfa96c7acd1bc17a48, 99a2ace61b211b0be861b07fbaa062fca4b58879
Linux/Linuxgeneric>=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <13b0e14bfa7e6d506d8d6426b9e6d7feef01ded3 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <5d1be493d1110c9e720b4c51a6e587bb2fb4ac12 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <a805729c0091073d8f0415cfa96c7acd1bc17a48 || >=4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 <99a2ace61b211b0be861b07fbaa062fca4b5887913b0e14bfa7e6d506d8d6426b9e6d7feef01ded3, 9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02, 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12, a805729c0091073d8f0415cfa96c7acd1bc17a48, 99a2ace61b211b0be861b07fbaa062fca4b58879

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12; Linux/Linux to 9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02; Linux/Linux to 13b0e14bfa7e6d506d8d6426b9e6d7feef01ded3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 12, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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().

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 6, 2026
References
5 linked sources
Open source record