CVE-2026-68474 powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()
An out-of-bounds access in the Linux kernel's SPU filesystem allows attackers to potentially execute code or escalate privileges.
- 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-2026-68474?
CVE-2026-68474 is a high-severity memory corruption vulnerability in Linux, published on 15 Aug 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:
powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()
spufs_mem_mmap_access() computes the local store offset as address - vma->vm_start, but bounds-checks it against vma->vm_end instead of the local store size. On 64-bit, offset is always well below vma->vm_end, so the clamp never fires and len stays unbounded against the LS_SIZE buffer returned by ctx->ops->get_ls().
Reject offsets at or beyond LS_SIZE and clamp len to the remaining space, mirroring the guard already used by spufs_mem_mmap_fault() and spufs_ps_fault().
Which versions are affected by CVE-2026-68474?
How do I fix CVE-2026-68474?
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-2026-68474 being exploited?
There is no known exploitation of CVE-2026-68474 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68474, DEBIAN-CVE-2026-68474, GHSA-g9qw-r5fh-4wjp, UBUNTU-CVE-2026-68474.