CVE-2026-93198 is a vulnerability in Linux Kernel
Published on September 17, 2026
dm-pcache: validate the persisted dirty_tail chain at load
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.
Products Associated with CVE-2026-93198
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Affected Versions
Linux:- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 8195cf3f4a82ef49d9b0651c507ed0784caf23fb is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 4822a030929e0e77aa380722dc42e3e4c9edd346 is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.