SB20260816104 - Improper Check for Unusual or Exceptional Conditions in Linux kernel arm64 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-72277)

CWE-ID: CWE-754 - Improper Check for Unusual or 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 handling of non-memory PFNs in KVM nested virtualization on arm64 when constructing an l1 vncr mapping. A local user can trigger translation of a vncr mapping backed by a non-memory pfn to cause a denial of service.

The issue can result in an SError on writeback or an injected synchronous external abort in the guest.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4bd7dbe0b2243e6aa735cae4d5e1ff988b30b2a6
• https://git.kernel.org/stable/c/bc00e0e376ee3572f5d26c174473abef1e35decc
• https://git.kernel.org/stable/c/d5436e18e4fc2886ac306304d884ea3b92e1edbf