{"id":"CVE-2026-90066","title":"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…","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e1067a07cfbc5a36abad3752fafe4c79e06db1bb < 7a96b9f6d5ba23dbce66c8a4a242effd4c01a830","Linux >= e1067a07cfbc5a36abad3752fafe4c79e06db1bb < 98b7b2a29ae87937aa02ab9391543ef8c602cd94","Linux >= e1067a07cfbc5a36abad3752fafe4c79e06db1bb < 626614df9080d7052fbe24dc90b5434717ab7a9f","Linux >= e1067a07cfbc5a36abad3752fafe4c79e06db1bb < cf839636911d8313f3ecd098329fd0b96499e4cf","Linux >= e1067a07cfbc5a36abad3752fafe4c79e06db1bb < 6727b7618f49401acf373fa3ec5712e2ec52e5cf","Linux 5.16"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:16:55.437","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90066","references":[{"url":"https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.900Z","epss":0.002,"epssPercentile":0.10103,"slug":"CVE-2026-90066","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}