What happened
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: clamp the tail kset read to the segment data region The tail-kset read in cache_replay(), the writeback worker and the GC worker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment size rather than the data region. A tail near the segment end reads past the segment data into the following control area. Clamp the read to cache_seg_remain(), the data region.
Affected versions
Linux: 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 through before 2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c (git); 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 through before 1ab55354368d071ebaee4d8c82313955eab65a04 (git); 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 through before becf07e2b0053027495ecd671b1f82fb2e615f68 (git); 6.18 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.