CVE-2026-90066

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f
https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf
https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830
https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94
https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf

Configurations

No configuration.

History

17 Sep 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:16

Updated : 2026-09-17 17:16

NVD link : CVE-2026-90066

Mitre link : CVE-2026-90066

CVE.ORG link : CVE-2026-90066

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-90066", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"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-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["samples/ftrace/ftrace-direct-multi-modify.c"], "defaultStatus": "affected"}]}], "published": "2026-09-17T17:16:55.437", "references": [{"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", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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()'s 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."}], "lastModified": "2026-09-17T17:16:55.437", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}