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CVE-2026-89749 (GCVE-0-2026-89749)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
tracing: Fix crash passing ERR_PTR to kthread_stop()
Summary
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()").
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < c1a4fb7aa290f158d50654d640292e49d9055fd1 (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < 42ccb215ef0a552acbbd32f81009bfe4b278ba77 (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < 98d06fb9865a490e12ebe32d65b9ffac6108614d (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < ceb1707aef5824cf024eb82d10787b7621e2ff35 (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < 12a499f741fc5be3731c8b0a0d909406575cc2eb (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < adadf4192f700bca82abfda9fa6d58c0bf37cc04 (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < c40e0b4fa365969e67011529eabdfb66d1022256 (git)
Affected: e6187007d6c365b551c69ea3df46f06fd1c8bd19 , < 649bc7df3e5d7be6f7996a95084037dbf3cad1e5 (git)
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Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix crash passing ERR_PTR to kthread_stop()\n\nevent_test_stuff() calls kthread_run() and unconditionally passes the\nreturned task_struct pointer to kthread_stop(). kthread_run() returns an\nerror pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for\nexample under memory pressure during the boot-time event self-test.\nkthread_stop() then dereferences the invalid pointer, crashing the kernel.\n\nCheck the result of kthread_run() before passing it to kthread_stop(). Use\nWARN_ON() so that a failure to create the self-test thread does not go\nunnoticed, matching the ring-buffer self-test fix in commit\n91542863abad (\"ring-buffer: Fix crash passing ERR_PTR to kthread_stop()\")."
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        "shortName": "Linux"
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    "datePublished": "2026-09-11T19:46:53.822Z",
    "dateReserved": "2026-09-11T19:38:34.762Z",
    "dateUpdated": "2026-09-14T12:02:28.892Z",
    "state": "PUBLISHED"
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Use\\nWARN_ON() so that a failure to create the self-test thread does not go\\nunnoticed, matching the ring-buffer self-test fix in commit\\n91542863abad (\\\"ring-buffer: Fix crash passing ERR_PTR to kthread_stop()\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"c1a4fb7aa290f158d50654d640292e49d9055fd1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"42ccb215ef0a552acbbd32f81009bfe4b278ba77\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"98d06fb9865a490e12ebe32d65b9ffac6108614d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"ceb1707aef5824cf024eb82d10787b7621e2ff35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"12a499f741fc5be3731c8b0a0d909406575cc2eb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"adadf4192f700bca82abfda9fa6d58c0bf37cc04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"c40e0b4fa365969e67011529eabdfb66d1022256\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6187007d6c365b551c69ea3df46f06fd1c8bd19\",\"lessThan\":\"649bc7df3e5d7be6f7996a95084037dbf3cad1e5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.31\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.31\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/12a499f741fc5be3731c8b0a0d909406575cc2eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/42ccb215ef0a552acbbd32f81009bfe4b278ba77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/649bc7df3e5d7be6f7996a95084037dbf3cad1e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98d06fb9865a490e12ebe32d65b9ffac6108614d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/adadf4192f700bca82abfda9fa6d58c0bf37cc04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1a4fb7aa290f158d50654d640292e49d9055fd1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c40e0b4fa365969e67011529eabdfb66d1022256\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ceb1707aef5824cf024eb82d10787b7621e2ff35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-15T08:13:21+00:00",
      "cve": "CVE-2026-89749",
      "id": "CVE-2026-89749",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Fix crash passing ERR_PTR to kthread_stop()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89749.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T16:56:27Z",
      "cve": "CVE-2026-89749",
      "id": "CVE-2026-89749",
      "initial_release_date": "2026-09-12T16:22:17Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89749",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89749.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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