Medium [CVE-2026-64160] Fix potential for tearing in ->remote_i_size and ->zero_point
This medium-severity Red Hat Linux advisory covers CVE-2026-64160 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential for tearing in ->remote_i_size and ->zero_point Fix potential tearing in using ->remote_i_size and ->zero_point by copying i_size_read() and i_size_write() and using the same seqcount as for i_size.
We need to make sure that netfslib and the filesystems that use it always hold i_lock whilst updating any of the sizes to prevent i_size_seqcount from getting corrupted. A flaw was found in the Linux kernel's network file system (netfs) component.
This vulnerability, known as 'tearing', occurs when the system attempts to update file size information (`remote_i_size` and `zero_point`) without proper synchronization. This can lead to corrupted file size counters (`i_size_seqcount`), potentially causing data integrity issues or incorrect reporting of file sizes.
An attacker could potentially exploit this to manipulate file sizes or cause system instability. A race in netfs size handling can expose torn or inconsistent 64-bit values for remote_i_size and zero_point, especially on 32-bit systems.
These fields affect decisions about the real remote file size and the point above which reads may be treated as zero filled, so inconsistent values can cause wrong I/O behavior, stale or incorrect data handling, and availability problems such as hangs or repeated seqcount retries.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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