Linux Kernel netfs: Zero Gaps in Read-Gaps Folio to Prevent Stale Data Write
CVE-2026-98843 Published on October 18, 2026
netfs: zero gaps in read-gaps folio to avoid writing back stale data
In the Linux kernel, the following vulnerability has been resolved:
netfs: zero gaps in read-gaps folio to avoid writing back stale data
netfs_read_gaps() leaves gaps around a streaming write's dirty region
unread on the server side, so a short/EOF response there left stale
folio content that later got written back.
Zero it after the read completes, not before: netfs_wait_for_read()
returns rreq->transferred once ret >= 0, so build an iterator over the
same bvec array the read used, advance past ret, and zero the rest.
The dirty region already maps to sink pages in that array rather than
the real folio, so this can't touch it, and only the actual shortfall
gets zeroed instead of the whole gap upfront.
Products Associated with CVE-2026-98843
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below 512eaf01ffabf4258e945016b50df5aed940b705 is affected.
- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below 2a62fe628a877c249c8286b157ee99d82840d9dc is affected.
- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below 8db55c5cd831a786a1a2a2d391aa80354535a353 is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.18.56, <= 6.18.* is unaffected.
- Version 7.2.10, <= 7.2.* is unaffected.
- Version 7.3-rc6, <= * is unaffected.