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VulnerabilityPublished

CVE-2026-99251: Linux kernel · Drivers: hv: Avoid infinite retry loop in init_vp_index()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f561392afb44a8a42c54c1cfd3f33dace0b50537 : update Linux kernel when convenient.

Data as of 3 Nov 2026, 11:43 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f561392afb44a8a42c54c1cfd3f33dace0b50537, b3993f6dc106ff416c7a613c631e1e0af451aed7, 7141331f2d245efc07175802a6bf76badec871ed +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 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 3 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < f561392afb44a8a42c54c1cfd3f33dace0b50537
Fixed in
  • f561392afb44a8a42c54c1cfd3f33dace0b50537
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < b3993f6dc106ff416c7a613c631e1e0af451aed7
Fixed in
  • b3993f6dc106ff416c7a613c631e1e0af451aed7
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < 7141331f2d245efc07175802a6bf76badec871ed
Fixed in
  • 7141331f2d245efc07175802a6bf76badec871ed
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < 95fec47cdbf747b81ab22affd7252dda6050ad0c
Fixed in
  • 95fec47cdbf747b81ab22affd7252dda6050ad0c
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < 32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
Fixed in
  • 32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
LinuxLinuxAffected
  • ≥ 6640b5df1a38801be6d0595c8cd2177d968d7ee0, < 15dd3429f0e76ca071657e480cb7e6ff3a1af730
Fixed in
  • 15dd3429f0e76ca071657e480cb7e6ff3a1af730

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update to a Linux kernel version that includes these fixes. No additional mitigation is required once the patch is applied.

Description

CVE-2026-99251 is a vulnerability in the Linux kernel's hypervisor driver (hv) where an infinite retry loop can occur in the init_vp_index() function. This happens when the housekeeping CPU mask for a NUMA node contains no CPUs, causing the retry logic to loop indefinitely. The issue was fixed by adding checks to skip NUMA nodes without housekeeping CPUs and improving early abort conditions.

References

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