samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
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.
CVE-2026-90066
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90066
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
"lessThan": "7a96b9f6d5ba23dbce66c8a4a242effd4c01a830",
"versionType": "git"
},
{
"status": "affected",
"version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
"lessThan": "98b7b2a29ae87937aa02ab9391543ef8c602cd94",
"versionType": "git"
},
{
"status": "affected",
"version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
"lessThan": "626614df9080d7052fbe24dc90b5434717ab7a9f",
"versionType": "git"
},
{
"status": "affected",
"version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
"lessThan": "cf839636911d8313f3ecd098329fd0b96499e4cf",
"versionType": "git"
},
{
"status": "affected",
"version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
"lessThan": "6727b7618f49401acf373fa3ec5712e2ec52e5cf",
"versionType": "git"
}
],
"programFiles": [
"samples/ftrace/ftrace-direct-multi-modify.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"samples/ftrace/ftrace-direct-multi-modify.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90066
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36483 · Revision 1
- Added to Heist Feed
- Publisher date