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CVE-2025-40170

net: use dst_dev_rcu() in sk_setup_caps()

HIGH
7.8
CVSS Score
Published: November 12, 2025 at 10:46 AM UTC
Updated: October 21, 2026 at 01:18 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
4.134a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36
Vendor states this is fixed in 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12 (fixed)
Vendor states this is fixed in 99a2ace61b211b0be861b07fbaa062fca4b58879 (fixed)
Vendor states this is fixed in a805729c0091073d8f0415cfa96c7acd1bc17a48 (fixed)
Vendor states this is fixed in 4.13 (unaffected)
Vendor states this is fixed in 6.12.64 (unaffected)
Vendor states this is fixed in 6.17.3 (unaffected)
Vendor states this is fixed in 6.18 (unaffected)
Vendor states this is fixed in 6.6.160 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord
https://git.kernel.org/stable/c/a805729c0091073d8f0415cfa96c7acd1bc17a48
Source: cverecord
https://git.kernel.org/stable/c/99a2ace61b211b0be861b07fbaa062fca4b58879
Source: cverecord
https://git.kernel.org/stable/c/5d1be493d1110c9e720b4c51a6e587bb2fb4ac12
Source: cverecord
https://git.kernel.org/stable/c/9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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