tracing: Fix crash passing ERR_PTR to kthread_stop() (CVE-2026-89749) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89749

tracing: Fix crash passing ERR_PTR to kthread_stop()

Answer in brief

CVE-2026-89749 records a Unknown severity vulnerability in tracing: Fix crash passing ERR_PTR to kthread_stop(). 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.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=e6187007d6c365b551c69ea3df46f06fd1c8bd19 <12a499f741fc5be3731c8b0a0d909406575cc2eb \|\| >=e6187007d6c365b551c69ea3df46f06fd1c8bd19 <adadf4192f700bca82abfda9fa6d58c0bf37cc04 \|\| >=e6187007d6c365b551c69ea3df46f06fd1c8bd19 <c40e0b4fa365969e67011529eabdfb66d1022256 \|\| >=e6187007d6c365b551c69ea3df46f06fd1c8bd19 <649bc7df3e5d7be6f7996a95084037dbf3cad1e5	12a499f741fc5be3731c8b0a0d909406575cc2eb, adadf4192f700bca82abfda9fa6d58c0bf37cc04, c40e0b4fa365969e67011529eabdfb66d1022256, 649bc7df3e5d7be6f7996a95084037dbf3cad1e5
Linux/Linuxgeneric	2.6.31	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 12a499f741fc5be3731c8b0a0d909406575cc2eb if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix crash passing ERR_PTR to kthread_stop() event_test_stuff() calls kthread_run() and unconditionally passes the returned task_struct pointer to kthread_stop(). kthread_run() returns an error pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for example under memory pressure during the boot-time event self-test. kthread_stop() then dereferences the invalid pointer, crashing the kernel. Check the result of kthread_run() before passing it to kthread_stop(). Use WARN_ON() so that a failure to create the self-test thread does not go unnoticed, matching the ring-buffer self-test fix in commit 91542863abad ("ring-buffer: Fix crash passing ERR_PTR to kthread_stop()").

Quoted source text, attributed separately from HOL analysis.