CVE-2026-52968 KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic
Out-of-bounds memory access in Linux kernel KVM s390 PCI code due to incorrect pointer arithmetic, potentially allowing code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52968?
CVE-2026-52968 is a high-severity memory corruption vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic
kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() index the GAIT by manually multiplying the index with sizeof(struct zpci_gaite).
Since aift->gait is already a struct zpci_gaite pointer, this double-scales the offset, accessing element aisb*16 instead of aisb.
This causes out-of-bounds accesses when aisb >= 32 (with ZPCI_NR_DEVICES=512)
Fix by removing the erroneous sizeof multiplication.
Weakness: CWE-125
Which versions are affected by CVE-2026-52968?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-52968?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-52968 being exploited?
There is no known exploitation of CVE-2026-52968 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-52968, DEBIAN-CVE-2026-52968, GHSA-8vvj-3j37-6m3p, ROOT-OS-DEBIAN-12-CVE-2026-52968, ROOT-OS-UBUNTU-2204-CVE-2026-52968, ROOT-OS-UBUNTU-2404-CVE-2026-52968 and 1 more.