CVE-2026-31592

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock

Take and hold kvm->lock for before checking sev_guest() in

sev_mem_enc_register_region(), as sev_guest() isn't stable unless kvm->lock

is held (or KVM can guarantee KVM_SEV_INIT{2} has completed and can't

rollack state). If KVM_SEV_INIT{2} fails, KVM can end up trying to add to

a not-yet-initialized sev->regions_list, e.g. triggering a #GP

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

CPU: 110 UID: 0 PID: 72717 Comm: syz.15.11462 Tainted: G U W O 6.16.0-smp-DEV #1 NONE

Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE

Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.52.0-0 10/28/2024

RIP: 0010:sev_mem_enc_register_region+0x3f0/0x4f0 ../include/linux/list.h:83

Code: <41> 80

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References