CVE-2026-90066 (GCVE-0-2026-90066)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-10-30 12:34
VLAI
EPSS
VEX
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
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 02866f063062dcc5686445c738be003de9787250
(git)
Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 7a96b9f6d5ba23dbce66c8a4a242effd4c01a830 (git) Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 98b7b2a29ae87937aa02ab9391543ef8c602cd94 (git) Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 626614df9080d7052fbe24dc90b5434717ab7a9f (git) Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < cf839636911d8313f3ecd098329fd0b96499e4cf (git) Affected: e1067a07cfbc5a36abad3752fafe4c79e06db1bb , < 6727b7618f49401acf373fa3ec5712e2ec52e5cf (git) |
guessed | |
| Linux | Linux |
Affected:
5.16
Unaffected: 0 , < 5.16 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (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 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"samples/ftrace/ftrace-direct-multi-modify.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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}
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},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"samples/ftrace/ftrace-direct-multi-modify.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"lessThan": "5.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "5.16",
"vulnerable": true
},
{
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:34:00.306Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/02866f063062dcc5686445c738be003de9787250"
},
{
"url": "https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830"
},
{
"url": "https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94"
},
{
"url": "https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f"
},
{
"url": "https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf"
},
{
"url": "https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf"
}
],
"title": "samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify",
"x_generator": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-90066",
"datePublished": "2026-09-17T16:05:48.921Z",
"dateReserved": "2026-09-11T19:38:34.784Z",
"dateUpdated": "2026-10-30T12:34:00.306Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-11-09",
"epss": "0.00206",
"percentile": "0.10655"
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"microsoft_vex": {
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"cve": "CVE-2026-90066",
"id": "msrc_CVE-2026-90066",
"initial_release_date": "2026-09-19T01:11:18.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90066.json",
"version": "6"
},
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],
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{
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{
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},
{
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{
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}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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."
}
],
"id": "CVE-2026-90066",
"lastModified": "2026-10-30T13:20:40.367",
"metrics": {},
"published": "2026-09-17T17:16:55.437",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/02866f063062dcc5686445c738be003de9787250"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830"
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"url": "https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf"
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-11-06T19:52:03+00:00",
"cve": "CVE-2026-90066",
"id": "CVE-2026-90066",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_not_affected": "203",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90066.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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