CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory
A missing bounds check in the Linux kernel dm-pcache driver allows out-of-bounds writes via crafted persistent memory keys, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98867?
CVE-2026-98867 is a memory corruption vulnerability in Linux, published on 18 Oct 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:
dm-pcache: bound the logical key offset from persistent memory
cache_key_decode() takes a key's logical off from the cache device and later indexes req_key_tree->subtrees[] by it in get_subtree(). An off past the device forms a subtree pointer outside the array, which rb_insert() writes through during replay.
Reject a key of zero length, or whose off+len (computed in 64 bits) exceeds the device size, before it is used.
Which versions are affected by CVE-2026-98867?
How do I fix CVE-2026-98867?
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-2026-98867 being exploited?
There is no known exploitation of CVE-2026-98867 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98867, DEBIAN-CVE-2026-98867, GHSA-f472-jf6w-c35h, UBUNTU-CVE-2026-98867.