CVE-2026-93198
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
dm-pcache: validate the persisted dirty_tail chain at load
The writeback worker follows the persisted dirty_tail chain, which is
decoded from the cache device independently of the key_tail chain that
cache_replay() walks and bounds. A crafted image, whose on-media fields are
authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a
chain of last ksets that never terminates, so cache_writeback_fn() re-arms
itself with no delay forever.
Walk the dirty_tail chain once at load with the same hop cap cache_replay()
uses and fail the table load with -EIO if it does not reach an end within
n_segs hops.
https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346
https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b
https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb