CVE-2025-40170

High

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().

Package Linux Kernel
Published 2025-11-12
Last modified 2026-07-30
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 4.13 and later are affected. Fixed in 6.12.64, 6.17.3, 6.18 and their respective stable series.

Affected from
≥ 4.13
Fixed in
✓ 6.12.64 6.12.x ✓ 6.17.3 6.17.x ✓ 6.18

References

3 total

Frequently asked questions

  • What is CVE-2025-40170?

    CVE-2025-40170 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.13 onward and has been patched in 6.12.64, 6.17.3 and 6.18. CVE-2025-40170 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-40170?

    CVE-2025-40170 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2025-40170?

    Yes. CVE-2025-40170 has been patched. Fixed versions include 6.12.64, 6.17.3 and 6.18. If you are running Linux kernel 4.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-40170 actively exploited?

    No. CVE-2025-40170 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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