CVE-2026-31591
KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish
Summary
KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish
Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as
allowing userspace to manipulate and/or run a vCPU while its state is being
synchronized would at best corrupt vCPU state, and at worst crash the host
kernel.
Opportunistically assert that vcpu->mutex is held when synchronizing its
VMSA (the SEV-ES path already locks vCPUs).
Affected packages
Linux
Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.20.0"},{"fixed":"7.0.1"}]}]
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-31591 linux-lts
- Debian DEBIAN-CVE-2026-31591 linux
- Ubuntu UBUNTU-CVE-2026-31591 linux-hwe-edge
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org