Linux kernel dm-pcache OOB write via logical key offset in cache_key_decode
CVE-2026-98867 Published on October 18, 2026
dm-pcache: bound the logical key offset from persistent memory
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.
Products Associated with CVE-2026-98867
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Affected Versions
Linux:- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 3d5a87cb909c1f375f08065b20123fa5db5958d8 is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 10449703200076980704894c3d68d6796182371b is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 97fc4b53dbe4a983fdf093243067fa6a64562307 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.10, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.