Linux Kernel dm-pcache: kset size overflow BUG_ON
CVE-2026-98868 Published on October 18, 2026
dm-pcache: reject a kset that overruns its segment
In the Linux kernel, the following vulnerability has been resolved:
dm-pcache: reject a kset that overruns its segment
cache_replay(), the writeback worker and the GC worker read a kset of
get_kset_onmedia_size() bytes and advance the position by it. A forged
key_num makes that size exceed the segment's remaining space, so the
advance walks past the segment and trips the cache_pos_advance() BUG_ON.
Reject a kset whose on-media size exceeds cache_seg_remain() before use.
Products Associated with CVE-2026-98868
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Affected Versions
Linux:- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 01a700e9278da5706c865b9ca3ae70fdb7b4531d is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10 is affected.
- Version 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 and below 7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb 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.