Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.8, < 6.18.6 |
References
- https://git.kernel.org/stable/c/19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe
- https://git.kernel.org/stable/c/5b7f91acffd2c4c000971553d22efa1e1bb4feaePatch
- https://git.kernel.org/stable/c/5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdbPatch
- https://git.kernel.org/stable/c/9b03768037d91ce727effb1c5d92d2c7781bf692
FAQ
What is CVE-2026-23138?
CVE-2026-23138 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2026-23138?
CVE-2026-23138 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23138?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.