Quick answers
- Is CVE-2026-98844 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-98844 being exploited in the wild.
- How severe is CVE-2026-98844?
- Informational severity, published 18 October 2026.
- Which products and versions are affected?
- Linux kernel unspecified.
- Is there a fix for CVE-2026-98844?
- A patch was published on 2026-10-18. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-98844 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-98844?
- Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in netfs's handling of post-EOF pagecache when files are extended via writes. When dirty data previously written through mmap regions exists beyond the EOF, neither buffered nor unbuffered write paths clear this stale pagecache. The fix zeros the folio straddling the EOF before extending writes while respecting concurrent access patterns and IOCB_NOWAIT semantics by re-reading i_size under folio lock.
Affected products
- Linux kernel unspecified
Timeline
- 2026-10-18: patched