VulnerabilityPublished 10 Jul 2025Updated 5 Nov 2026

CVE-2025-38324: Linux kernel · mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu().

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f19cbd84e645e39bc3228e1191bb151ef0ffac8c : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:33 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in f19cbd84e645e39bc3228e1191bb151ef0ffac8c, d8cd847fb8626872631cc22d44be5127b4ebfb74, a060781640012d5d5105072f4c44ed6ad6830ef9 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < f19cbd84e645e39bc3228e1191bb151ef0ffac8c	Fixed in f19cbd84e645e39bc3228e1191bb151ef0ffac8c
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < d8cd847fb8626872631cc22d44be5127b4ebfb74	Fixed in d8cd847fb8626872631cc22d44be5127b4ebfb74
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < a060781640012d5d5105072f4c44ed6ad6830ef9	Fixed in a060781640012d5d5105072f4c44ed6ad6830ef9
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < 2919297b18e5a5fb7e643f9e32c12c0b17cce1be	Fixed in 2919297b18e5a5fb7e643f9e32c12c0b17cce1be
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < 517bc6836ee9fcffe2539f6f6aa3fdd9c7a7ae73	Fixed in 517bc6836ee9fcffe2539f6f6aa3fdd9c7a7ae73
LinuxLinux	Affected ≥ 0189197f441602acdca3f97750d392a895b778fd, < 49b8a9d7d44401a186e20b1aaf591d2e62727aeb	Fixed in 49b8a9d7d44401a186e20b1aaf591d2e62727aeb

AI-suggested

A fix is available and has been applied in the Linux kernel source code as indicated by multiple fixed commit versions. Users should update their Linux kernel to a version containing these fixes to resolve the issue. No additional mitigation steps are required beyond applying the official patch.

Description

A vulnerability in the Linux kernel's MPLS subsystem was identified and resolved by changing the usage of rcu_dereference() to rcu_dereference_rtnl() in the mpls_route_input_rcu() function. This change addresses a suspicious RCU usage warning triggered when mpls_route_input_rcu() is called under RTNL lock context, ensuring proper synchronization and preventing potential kernel instability or crashes.

Impact

The vulnerability could lead to suspicious RCU usage warnings and potentially cause kernel instability or crashes due to improper synchronization in the MPLS routing code. No evidence of exploitation in the wild is reported. The impact is limited to kernel stability and correctness rather than direct security compromise.

Summary

The Linux kernel MPLS subsystem had improper use of rcu_dereference() in the mpls_route_input_rcu() function, which can be called from mpls_getroute() under RTNL lock. Since net->mpls.platform_label is updated only under RTNL, the fix replaces rcu_dereference() with rcu_dereference_rtnl() to correctly handle RCU dereferencing under RTNL lock, silencing kernel warnings and preventing potential race conditions or kernel faults. This issue was reported by syzbot and fixed in multiple commits.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2026, 21:33 UTC

Technical details

References

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