Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:nilfs2: fix kernel bug due to missing clearing of checked flagSyzbot reported that in directory operations after nilfs2 detectsfilesystem corruption and degrades to read-only,__block_write_begin_int(), which is called to prepare block writes, mayfail the BUG_ON check for accesses exceeding the folio/page size,triggering a kernel bug.This was found to be because the "checked" flag of a page/folio was notcleared when it was discarded by nilfs2's own routine, which causes thesanity check of directory entries to be skipped when the directorypage/folio is reloaded. So, fix that.This was necessary when the use of nilfs2's own page discard routine wasapplied to more than just metadata files.
No PoCs from references.
- https://github.com/w4zu/Debian_security