SB2026091667 - Operation on a Resource after Expiration or Release in Linux kernel kvm
Published: September 16, 2026
Security Bulletin ID
SB2026091667
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Operation on a Resource after Expiration or Release (CVE-ID: CVE-2026-90040)
CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release
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 resource lifetime management in the KVM SEV-SNP VMSA handling when invalidating a backing guest_memfd page. A local user can invalidate the backing gmem page for a VMSA to cause a denial of service.
Remediation
Install update from vendor's website.