{"id":"CVE-2026-89749","summary":"tracing: Fix crash passing ERR_PTR to kthread_stop()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix crash passing ERR_PTR to kthread_stop()\n\nevent_test_stuff() calls kthread_run() and unconditionally passes the\nreturned task_struct pointer to kthread_stop(). kthread_run() returns an\nerror pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for\nexample under memory pressure during the boot-time event self-test.\nkthread_stop() then dereferences the invalid pointer, crashing the kernel.\n\nCheck the result of kthread_run() before passing it to kthread_stop(). Use\nWARN_ON() so that a failure to create the self-test thread does not go\nunnoticed, matching the ring-buffer self-test fix in commit\n91542863abad (\"ring-buffer: Fix crash passing ERR_PTR to kthread_stop()\").","modified":"2026-09-13T03:47:20.689125534Z","published":"2026-09-11T19:46:53.822Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89749.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/12a499f741fc5be3731c8b0a0d909406575cc2eb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/649bc7df3e5d7be6f7996a95084037dbf3cad1e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/adadf4192f700bca82abfda9fa6d58c0bf37cc04"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c40e0b4fa365969e67011529eabdfb66d1022256"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89749.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89749"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e6187007d6c365b551c69ea3df46f06fd1c8bd19"},{"fixed":"12a499f741fc5be3731c8b0a0d909406575cc2eb"},{"fixed":"adadf4192f700bca82abfda9fa6d58c0bf37cc04"},{"fixed":"c40e0b4fa365969e67011529eabdfb66d1022256"},{"fixed":"649bc7df3e5d7be6f7996a95084037dbf3cad1e5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89749.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.31"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89749.json"}}],"schema_version":"1.9.0"}