Answer in brief
CVE-2026-23138 records a Medium severity (CVSS 5.5) vulnerability in tracing: Add recursion protection in kernel stack trace recording. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce <80fe242a6239778025ba3be8e7263e3d69c37947 || >=5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce <9b03768037d91ce727effb1c5d92d2c7781bf692 || >=5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce <19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe || >=5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce <5b7f91acffd2c4c000971553d22efa1e1bb4feae || >=5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce <5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb | 80fe242a6239778025ba3be8e7263e3d69c37947, 9b03768037d91ce727effb1c5d92d2c7781bf692, 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe, 5b7f91acffd2c4c000971553d22efa1e1bb4feae, 5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
Feb 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.