Medium 5.5Published Feb 14, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce before 9b03768037d91ce727effb1c5d92d2c7781bf692; from 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce before 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe; 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce builds before 5b7f91acffd2c4c000971553d22efa1e1bb4feae; 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce builds before 5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb	CNA record
linux linux_kernel linux:linux_kernel	from 5.8 before 6.18.6; 6.19; 6.19; 6.19; 6.19	NVD

References

References

https://git.kernel.org/stable/c/9b03768037d91ce727effb1c5d92d2c7781bf692
https://git.kernel.org/stable/c/19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe
https://git.kernel.org/stable/c/5b7f91acffd2c4c000971553d22efa1e1bb4feae	patch
https://git.kernel.org/stable/c/5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.