Kernel-level race in widely deployed Linux netfslib can corrupt file size handling across servers using network filesystems, risking data integrity and uptime.
CVE-2026-64160
Linux kernel netfs race may corrupt file sizes, causing data corruption or DoS.
Is CVE-2026-64160 being exploited?
Not confirmed. CVE-2026-64160 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-64160?
CVE-2026-64160 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64160?
Yes. A fix has been recorded for CVE-2026-64160. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64160 affect?
CVE-2026-64160 affects Linux kernel (netfslib/netfs), Filesystems using netfslib (network filesystems). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64160?
Apply vendor kernel updates and reboot affected systems ASAP.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Race in netfslib i_size/zero_point handling lets local or remote filesystem users trigger incorrect file sizes, leading to data corruption, inconsistent reads, or denial-of-service.
Immediate action required
- affected>= 4058f742105ecfcbdf99e1139e6c1f74fb8e6db9 and < 55970f238d495517edc961d55c44c772594d0969
- affected>= 4058f742105ecfcbdf99e1139e6c1f74fb8e6db9 and < 2c8f4742bb76117d735f92a3932d85239b16c494
- affected5.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.