CVE-2026-99242: Linux kernel · ntfs: fix race between fallocate and mmap reads
Source GCVE Database
Not known to be exploited : upgrade to 67aded1da114dc44808315f249bd9e7e440f799d or 7dd1c2fec6ebdd1a88a02cb58ff515a258eeb327 soon.
Data as of 2 Nov 2026, 19:29 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in 67aded1da114dc44808315f249bd9e7e440f799d, 7dd1c2fec6ebdd1a88a02cb58ff515a258eeb327
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.
What to do
Upgrade Linux kernel to 67aded1da114dc44808315f249bd9e7e440f799d or 7dd1c2fec6ebdd1a88a02cb58ff515a258eeb327.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available that ensures the invalidate_lock is taken for all fallocate operations, preventing concurrent mmap page faults from accessing uninitialized clusters. Users should apply the official Linux kernel update that includes this fix once available. No alternative mitigations are specified.
Description
A race condition vulnerability in the Linux kernel's NTFS fallocate implementation allows concurrent mmap reads to access uninitialized disk data, leading to potential information leaks and data integrity issues. The flaw arises because the invalidate_lock is not held during standard allocation modes, permitting mmap page faults to read old disk contents. The issue is fixed by ensuring the invalidate_lock is taken for all fallocate operations.