CVE-2026-90066 (GCVE-0-2026-90066)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-09-17 16:05
VLAI
Title
samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
Summary
In the Linux kernel, the following vulnerability has been resolved: samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify ftrace_direct_multi_init() assigns kthread_run()'s return value to simple_tsk without an IS_ERR() check. When kthread_run() fails it returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads with simple_tsk holding an error pointer. On unload, ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(), leading to a null-pointer-dereference. Check the return value of kthread_run() with IS_ERR(); on failure, unregister the ftrace direct call and propagate the error code.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 7a96b9f6d5ba23dbce66c8a4a242effd4c01a830 (git)
Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 98b7b2a29ae87937aa02ab9391543ef8c602cd94 (git)
Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 626614df9080d7052fbe24dc90b5434717ab7a9f (git)
Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < cf839636911d8313f3ecd098329fd0b96499e4cf (git)
Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 6727b7618f49401acf373fa3ec5712e2ec52e5cf (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsamples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify\n\nftrace_direct_multi_init() assigns kthread_run()\u0027s return value to\nsimple_tsk without an IS_ERR() check. When kthread_run() fails it\nreturns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads\nwith simple_tsk holding an error pointer. On unload,\nftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(),\nleading to a null-pointer-dereference.\n\nCheck the return value of kthread_run() with IS_ERR(); on failure,\nunregister the ftrace direct call and propagate the error code."
        }
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    "dateReserved": "2026-09-11T19:38:34.784Z",
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        "vulnStatus": "Received"
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}



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