SB20260828116 - Improper Check or Handling of Exceptional Conditions in Linux kernel arm64 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-80665)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper exception handling in KVM arm64 nested virtualization VNCR translation handling when processing VNCR aborts after kvm_translate_vncr() fails to resolve a PFN. A local user can trigger a translation failure involving a GFN outside of the memslots to cause a denial of service.

The issue occurs because late failures may be returned without the expected abort state being prepared for fault injection.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4ead4def04659739c399bfcb063f8a906194c79f
• https://git.kernel.org/stable/c/53804b6839573c9c6fff5f4cf075d6746267345e
• https://git.kernel.org/stable/c/9f3e83345a56280efffe235c65593c7e544c0fcc