{"id":"CVE-2026-90066","state":"PUBLISHED","title":"samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify","description":"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.","publishedAt":"2026-09-17T16:05:48.921Z","updatedAt":"2026-10-30T12:34:00.306Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"02866f063062dcc5686445c738be003de9787250","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"7a96b9f6d5ba23dbce66c8a4a242effd4c01a830","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"98b7b2a29ae87937aa02ab9391543ef8c602cd94","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"626614df9080d7052fbe24dc90b5434717ab7a9f","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"cf839636911d8313f3ecd098329fd0b96499e4cf","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"6727b7618f49401acf373fa3ec5712e2ec52e5cf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["samples/ftrace/ftrace-direct-multi-modify.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["samples/ftrace/ftrace-direct-multi-modify.c"]}],"references":["https://git.kernel.org/stable/c/02866f063062dcc5686445c738be003de9787250","https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830","https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94","https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f","https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf","https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90066.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90066","state":"PUBLISHED","datePublished":"2026-09-17T16:05:48.921Z","dateUpdated":"2026-10-30T12:34:00.306Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.784Z"},"containers":{"cna":{"title":"samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"02866f063062dcc5686445c738be003de9787250","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"7a96b9f6d5ba23dbce66c8a4a242effd4c01a830","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"98b7b2a29ae87937aa02ab9391543ef8c602cd94","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"626614df9080d7052fbe24dc90b5434717ab7a9f","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"cf839636911d8313f3ecd098329fd0b96499e4cf","versionType":"git"},{"version":"e1067a07cfbc5a36abad3752fafe4c79e06db1bb","status":"affected","lessThan":"6727b7618f49401acf373fa3ec5712e2ec52e5cf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["samples/ftrace/ftrace-direct-multi-modify.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["samples/ftrace/ftrace-direct-multi-modify.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:34:00.306Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}