x86/mce: Set up the polling timer before CMCI discovery

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Summary

CVECVE-2026-80727
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-03 13:06:11 UTC
Updated2026-09-03 13:06:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/mce: Set up the polling timer before CMCI discovery I hit the following on one of my machines: mce: CPU0 BANK15 CMCI inherited storm ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: (____ptrval____) object type: timer_list hint: 0x0 WARNING: lib/debugobjects.c:632 at debug_object_assert_init+0x178/0x230, CPU#0: swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc5 #3 PREEMPTLAZY RIP: 0010:debug_object_assert_init+0x18f/0x230 Call Trace: <TASK> __mod_timer mce_timer_kick cmci_discover intel_init_cmci mce_intel_feature_init mcheck_cpu_init identify_cpu identify_boot_cpu arch_cpu_finalize_init start_kernel A second splat follows right after, from timer_setup() finding that same timer already queued: ODEBUG: init active (active state 0) object: (____ptrval____) object type: timer_list hint: stub_timer+0x0/0x10 This is happening because CMCI storm detection is trying to modify the timer before latter was properly set up. Set up the timer first. __mcheck_cpu_setup_timer() only calls timer_setup(), and depends on neither the generic nor the vendor init. [ bp: Massage commit message. ]

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.098430000 (date 2026-09-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1f68ce2a027250aeeb1756391110cdc4dc97c797 17ab68d0cf6a41bff61b1e13c6141d9e463736ae git Not specified
CNA Linux Linux affected 1f68ce2a027250aeeb1756391110cdc4dc97c797 e708fc1566ebd4a2d3f2546e6310d64d362db80d git Not specified
CNA Linux Linux affected 1f68ce2a027250aeeb1756391110cdc4dc97c797 4f4cba3947d2f0eceb32727e198ca2c149a653a9 git Not specified
CNA Linux Linux affected 1f68ce2a027250aeeb1756391110cdc4dc97c797 a213dfaa2596c1c0dc4dae91c14fbfa499c03223 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e708fc1566ebd4a2d3f2546e6310d64d362db80d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17ab68d0cf6a41bff61b1e13c6141d9e463736ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f4cba3947d2f0eceb32727e198ca2c149a653a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a213dfaa2596c1c0dc4dae91c14fbfa499c03223 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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