CVE-2026-31558
Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust kvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so cpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this case so as to make it more robust. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-31558
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-31558.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.11-1 |
| debian | sid | fixed | 6.19.11-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 6.12.80 | |
| linux-kernel | 6.10 | affected | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354
- https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b
- https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910
- https://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418
- https://www.suse.com/security/cve/CVE-2026-31558.html
- https://security-tracker.debian.org/tracker/CVE-2026-31558
CWEs
CWE-125
Verify integrity in audit chain (admin only). AS-IS.