{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40260","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.182Z","datePublished":"2025-12-04T16:08:20.590Z","dateUpdated":"2026-05-11T21:45:53.934Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:45:53.934Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Fix scx_enable() crash on helper kthread creation failure\n\nA crash was observed when the sched_ext selftests runner was\nterminated with Ctrl+\\ while test 15 was running:\n\nNIP [c00000000028fa58] scx_enable.constprop.0+0x358/0x12b0\nLR [c00000000028fa2c] scx_enable.constprop.0+0x32c/0x12b0\nCall Trace:\nscx_enable.constprop.0+0x32c/0x12b0 (unreliable)\nbpf_struct_ops_link_create+0x18c/0x22c\n__sys_bpf+0x23f8/0x3044\nsys_bpf+0x2c/0x6c\nsystem_call_exception+0x124/0x320\nsystem_call_vectored_common+0x15c/0x2ec\n\nkthread_run_worker() returns an ERR_PTR() on failure rather than NULL,\nbut the current code in scx_alloc_and_add_sched() only checks for a NULL\nhelper. Incase of failure on SIGQUIT, the error is not handled in\nscx_alloc_and_add_sched() and scx_enable() ends up dereferencing an\nerror pointer.\n\nError handling is fixed in scx_alloc_and_add_sched() to propagate\nPTR_ERR() into ret, so that scx_enable() jumps to the existing error\npath, avoiding random dereference on failure."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/sched/ext.c"],"versions":[{"version":"bff3b5aec1b727b620adc7c47085592802390125","lessThan":"625e173e2a59b6cf6cbfb51c0a6bea47f3861eab","status":"affected","versionType":"git"},{"version":"bff3b5aec1b727b620adc7c47085592802390125","lessThan":"7b6216baae751369195fa3c83d434d23bcda406a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/sched/ext.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.17.10","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.17.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab"},{"url":"https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a"}],"title":"sched_ext: Fix scx_enable() crash on helper kthread creation failure","x_generator":{"engine":"bippy-1.2.0"}}}}