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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 12a499f741fc5be3731c8b0a0d909406575cc2eb, 42ccb215ef0a552acbbd32f81009bfe4b278ba77, 649bc7df3e5d7be6f7996a95084037dbf3cad1e5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 12a499f741fc5be3731c8b0a0d909406575cc2eb, 42ccb215ef0a552acbbd32f81009bfe4b278ba77, 649bc7df3e5d7be6f7996a95084037dbf3cad1e5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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()").

—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.31affected
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before c1a4fb7aa290f158d50654d640292e49d9055fd1affected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before 42ccb215ef0a552acbbd32f81009bfe4b278ba77affected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before 98d06fb9865a490e12ebe32d65b9ffac6108614daffected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before ceb1707aef5824cf024eb82d10787b7621e2ff35affected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before 12a499f741fc5be3731c8b0a0d909406575cc2ebaffected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before adadf4192f700bca82abfda9fa6d58c0bf37cc04affected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before c40e0b4fa365969e67011529eabdfb66d1022256affected · git
    • e6187007d6c365b551c69ea3df46f06fd1c8bd19 and later · before 649bc7df3e5d7be6f7996a95084037dbf3cad1e5affected · git
    • before 2.6.31not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89747Sep 11, 2026 · tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
    31Monitor
  • ← EarlierCVE-2026-89748Sep 11, 2026 · tracing: Fix retry exhaustion in simple ring buffer reader swap
    31Monitor
  • Later →CVE-2026-89750Sep 11, 2026 · tracing/user_events: Clear copied tracing state before fork duplication
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux12a499f741fc5be3731c8b0a0d909406575cc2ebVendor (CNA)
Linux Linux42ccb215ef0a552acbbd32f81009bfe4b278ba77Vendor (CNA)
Linux Linux649bc7df3e5d7be6f7996a95084037dbf3cad1e5Vendor (CNA)
Linux Linux98d06fb9865a490e12ebe32d65b9ffac6108614dVendor (CNA)
Linux Linuxadadf4192f700bca82abfda9fa6d58c0bf37cc04Vendor (CNA)
Linux Linuxc1a4fb7aa290f158d50654d640292e49d9055fd1Vendor (CNA)
Linux Linuxc40e0b4fa365969e67011529eabdfb66d1022256Vendor (CNA)
Linux Linuxceb1707aef5824cf024eb82d10787b7621e2ff35Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records