{"id":"CVE-2026-80727","state":"PUBLISHED","title":"x86/mce: Set up the polling timer before CMCI discovery","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mce: Set up the polling timer before CMCI discovery\n\nI hit the following on one of my machines:\n\n  mce: CPU0 BANK15 CMCI inherited storm\n  ------------[ cut here ]------------\n  ODEBUG: assert_init not available (active state 0) object: (____ptrval____) object type: timer_list hint: 0x0\n  WARNING: lib/debugobjects.c:632 at debug_object_assert_init+0x178/0x230, CPU#0: swapper/0/0\n  CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc5 #3 PREEMPTLAZY\n  RIP: 0010:debug_object_assert_init+0x18f/0x230\n  Call Trace:\n   <TASK>\n   __mod_timer\n   mce_timer_kick\n   cmci_discover\n   intel_init_cmci\n   mce_intel_feature_init\n   mcheck_cpu_init\n   identify_cpu\n   identify_boot_cpu\n   arch_cpu_finalize_init\n   start_kernel\n\nA second splat follows right after, from timer_setup() finding that same\ntimer already queued:\n\n  ODEBUG: init active (active state 0) object: (____ptrval____) object type: timer_list hint: stub_timer+0x0/0x10\n\nThis is happening because CMCI storm detection is trying to modify the timer\nbefore latter was properly set up.\n\nSet up the timer first. __mcheck_cpu_setup_timer() only calls timer_setup(),\nand depends on neither the generic nor the vendor init.\n\n  [ bp: Massage commit message. ]","publishedAt":"2026-09-03T08:21:46.523Z","updatedAt":"2026-09-03T08:21:46.523Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"17ab68d0cf6a41bff61b1e13c6141d9e463736ae","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"e708fc1566ebd4a2d3f2546e6310d64d362db80d","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"4f4cba3947d2f0eceb32727e198ca2c149a653a9","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"a213dfaa2596c1c0dc4dae91c14fbfa499c03223","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/cpu/mce/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/cpu/mce/core.c"]}],"references":["https://git.kernel.org/stable/c/17ab68d0cf6a41bff61b1e13c6141d9e463736ae","https://git.kernel.org/stable/c/e708fc1566ebd4a2d3f2546e6310d64d362db80d","https://git.kernel.org/stable/c/4f4cba3947d2f0eceb32727e198ca2c149a653a9","https://git.kernel.org/stable/c/a213dfaa2596c1c0dc4dae91c14fbfa499c03223"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80727.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80727","state":"PUBLISHED","datePublished":"2026-09-03T08:21:46.523Z","dateUpdated":"2026-09-03T08:21:46.523Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.789Z"},"containers":{"cna":{"title":"x86/mce: Set up the polling timer before CMCI discovery","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mce: Set up the polling timer before CMCI discovery\n\nI hit the following on one of my machines:\n\n  mce: CPU0 BANK15 CMCI inherited storm\n  ------------[ cut here ]------------\n  ODEBUG: assert_init not available (active state 0) object: (____ptrval____) object type: timer_list hint: 0x0\n  WARNING: lib/debugobjects.c:632 at debug_object_assert_init+0x178/0x230, CPU#0: swapper/0/0\n  CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc5 #3 PREEMPTLAZY\n  RIP: 0010:debug_object_assert_init+0x18f/0x230\n  Call Trace:\n   <TASK>\n   __mod_timer\n   mce_timer_kick\n   cmci_discover\n   intel_init_cmci\n   mce_intel_feature_init\n   mcheck_cpu_init\n   identify_cpu\n   identify_boot_cpu\n   arch_cpu_finalize_init\n   start_kernel\n\nA second splat follows right after, from timer_setup() finding that same\ntimer already queued:\n\n  ODEBUG: init active (active state 0) object: (____ptrval____) object type: timer_list hint: stub_timer+0x0/0x10\n\nThis is happening because CMCI storm detection is trying to modify the timer\nbefore latter was properly set up.\n\nSet up the timer first. __mcheck_cpu_setup_timer() only calls timer_setup(),\nand depends on neither the generic nor the vendor init.\n\n  [ bp: Massage commit message. ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"17ab68d0cf6a41bff61b1e13c6141d9e463736ae","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"e708fc1566ebd4a2d3f2546e6310d64d362db80d","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"4f4cba3947d2f0eceb32727e198ca2c149a653a9","versionType":"git"},{"version":"1f68ce2a027250aeeb1756391110cdc4dc97c797","status":"affected","lessThan":"a213dfaa2596c1c0dc4dae91c14fbfa499c03223","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/cpu/mce/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/cpu/mce/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/17ab68d0cf6a41bff61b1e13c6141d9e463736ae"},{"url":"https://git.kernel.org/stable/c/e708fc1566ebd4a2d3f2546e6310d64d362db80d"},{"url":"https://git.kernel.org/stable/c/4f4cba3947d2f0eceb32727e198ca2c149a653a9"},{"url":"https://git.kernel.org/stable/c/a213dfaa2596c1c0dc4dae91c14fbfa499c03223"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-03T08:21:46.523Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}