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VulnerabilityPublished Updated

CVE-2026-68093: Linux kernel · KVM: SVM: Bump asid_generation on CPU online to avoid ASID collision after hotplug

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in 60283726f2845bd78b95efbd0e50b93944780477 : patch Linux kernel soon.

Data as of 6 Nov 2026, 18:18 UTC

Severity
High

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

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in 60283726f2845bd78b95efbd0e50b93944780477, 7508916b4b55d6f5ecc68cd09774dabd3a6b4440, 2028b81321dc757b6875b99c10d908e349c141e2 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Aug 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 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 60283726f2845bd78b95efbd0e50b93944780477
Fixed in
  • 60283726f2845bd78b95efbd0e50b93944780477
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 7508916b4b55d6f5ecc68cd09774dabd3a6b4440
Fixed in
  • 7508916b4b55d6f5ecc68cd09774dabd3a6b4440
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 2028b81321dc757b6875b99c10d908e349c141e2
Fixed in
  • 2028b81321dc757b6875b99c10d908e349c141e2
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 25f744ffa0c8e799e06250ce2e618367b166b0d4
Fixed in
  • 25f744ffa0c8e799e06250ce2e618367b166b0d4
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 6b542d116acecb83a1ca34e8eace304cff6a4ec9
Fixed in
  • 6b542d116acecb83a1ca34e8eace304cff6a4ec9
LinuxLinuxAffected
  • ≥ 774c47f1d78e373a6bd2964f4e278d1ce26c21cb, < 0f33b1c457c2199ed130b92cc2ff363a3f7b9415
Fixed in
  • 0f33b1c457c2199ed130b92cc2ff363a3f7b9415

AI-suggested

A fix is available and has been applied in the Linux kernel. The patch modifies the ASID generation logic to increment rather than reset the generation counter on CPU online events, preventing ASID collisions after hotplug cycles. Users should update to a Linux kernel version that includes the fix identified by the provided commit hashes.

Description

A vulnerability in the Linux kernel's KVM SVM virtualization subsystem allows ASID collisions after CPU hotplug events. This occurs when a virtual CPU (vCPU) resumes on a physical CPU (pCPU) that has undergone a hotplug cycle, causing stale Translation Lookaside Buffer (TLB) entries to be used due to ASID reuse. The issue manifests as KVM internal errors and emulation failures on certain instructions. The flaw is fixed by properly incrementing the ASID generation counter on CPU online events to prevent collisions.

References

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