What happened
In the Linux kernel, the following vulnerability has been resolved: jfs: handle set_blocksize failures jfs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting we will hit the BUG_ON(offset >= folio_size(folio)); in folio_set_bh on the first __bread_gfp call.
Affected versions
Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before a0ac22af8acca6ea6c57aff72662086cb3243b1c (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 153374ee67a458c77b5755d3cc57fbdc639d327e (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 05107f5602751fcfd3d108c1f579eb45aabead52 (git); 2.6.12 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.