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VulnerabilityPublished Updated

CVE-2026-23138: Linux kernel · tracing: Add recursion protection in kernel stack trace recording

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in 80fe242a6239778025ba3be8e7263e3d69c37947 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:33 UTC

Severity
Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in 80fe242a6239778025ba3be8e7263e3d69c37947, 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe, 9b03768037d91ce727effb1c5d92d2c7781bf692 +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Feb 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 80fe242a6239778025ba3be8e7263e3d69c37947
Fixed in
  • 80fe242a6239778025ba3be8e7263e3d69c37947
LinuxLinuxAffected
  • ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe
Fixed in
  • 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe
LinuxLinuxAffected
  • ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 9b03768037d91ce727effb1c5d92d2c7781bf692
Fixed in
  • 9b03768037d91ce727effb1c5d92d2c7781bf692
LinuxLinuxAffected
  • ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb
Fixed in
  • 5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb
LinuxLinuxAffected
  • ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 5b7f91acffd2c4c000971553d22efa1e1bb4feae
Fixed in
  • 5b7f91acffd2c4c000971553d22efa1e1bb4feae
LinuxLinuxAffected
  • =5.8
Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Add recursion protection in kernel stack trace recording A bug was reported about an infinite recursion caused by tracing the rcu events with the kernel stack trace trigger enabled. The stack trace code called back into RCU which then called the stack trace again. Expand the ftrace recursion protection to add a set of bits to protect events from recursion. Each bit represents the context that the event is in (normal, softirq, interrupt and NMI). Have the stack trace code use the interrupt context to protect against recursion. Note, the bug showed an issue in both the RCU code as well as the tracing stacktrace code. This only handles the tracing stack trace side of the bug. The RCU fix will be handled separately.

References

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