---
cve: "CVE-2026-80727"
severity: "LOW"
cvss: 3.1
epss: "3.7%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-03 13:06:11"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T13:40:53+02:00"
---

# CVE-2026-80727

> 3.1 LOW

## Beschreibung

In 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:
   
   __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. ]

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.105
- Kernel ≥ 6.18.45
- Kernel ≥ 7.1.9

## Referenzen

- <https://git.kernel.org/stable/c/17ab68d0cf6a41bff61b1e13c6141d9e463736ae>
- <https://git.kernel.org/stable/c/4f4cba3947d2f0eceb32727e198ca2c149a653a9>
- <https://git.kernel.org/stable/c/a213dfaa2596c1c0dc4dae91c14fbfa499c03223>
- <https://git.kernel.org/stable/c/e708fc1566ebd4a2d3f2546e6310d64d362db80d>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-80727) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_