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VulnerabilityPublished Updated

CVE-2026-64248: Linux kernel · MIPS: smp: report dying CPU to RCU in stop_this_cpu()

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 8 Nov 2026, 16:35 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Linux LinuxAffected
  • 6.1.175 – 7.0.11
5 affected builds
Fixed in–

AI-suggested

A fix has been implemented and backported to Linux kernel versions 6.1.175, 6.6.142, 6.12.92, 6.18.34, and 7.0.11. Users should update to these or later patched kernel versions to resolve the issue. No additional mitigation is required once updated.

Description

CVE-2026-64248 is a Linux kernel vulnerability affecting MIPS architectures where the stop_this_cpu() function does not properly report a dying CPU to the RCU subsystem. This causes RCU to wait indefinitely for quiescent states from CPUs that are offline but still spinning with interrupts disabled, leading to system hangs during reboot or shutdown. The issue was observed on Realtek MIPS switch SoCs and affects Linux kernel versions including 6.1.175, 6.6.142, 6.12.92, 6.18.34, and 7.0.11. The vulnerability has been fixed by ensuring the dying CPU is reported to RCU once interrupts are disabled, allowing grace periods to complete and preventing reboot hangs.

References

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