CVE-2026-64159

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix zeropoint update where i_size > remote_i_size Fix the update of the zero point[*] by netfs_release_folio() when there is uncommitted data in the pagecache beyond the folio being released but the on-server EOF is in this folio (ie. i_size > remote_i_size). The update needs to limit zero_point to remote_i_size, not i_size as i_size is a local phenomenon reflecting updates made locally to the pagecache, not stuff written to the server. remote_i_size tracks the server's i_size. [*] The zero point is the file position from which we can assume that the server will just return zeros, so we can avoid generating reads. Note that netfs_invalidate_folio() probably doesn't need fixing as zero_point should be updated by setattr after truncation or fallocate. Found with: fsx -q -N 1000000 -p 10000 -o 128000 -l 600000 \ /xfstest.test/junk --replay-ops=junk.fsxops using the following as junk.fsxops: truncate 0x0 0x1bbae 0x82864 write 0x3ef2e 0xf9c8 0x1bbae write 0x67e05 0xcb5a 0x4e8f6 mapread 0x57781 0x85b6 0x7495f copy_range 0x5d3d 0x10329 0x54fac 0x7495f write 0x64710 0x1c2b 0x7495f mapread 0x64000 0x1000 0x7495f on cifs with the default cache option. It shows read-gaps on folio 0x64 failing with a short read (ie. it hits EOF) if the FMODE_READ check is commented out in netfs_perform_write(): if (//(file->f_mode & FMODE_READ) || netfs_is_cache_enabled(ctx)) { and no fscache. This was initially found with the generic/522 xfstest.

• https://git.kernel.org/stable/c/4543a4d737944134a1394afe797622546fbcc98aPatch
• https://git.kernel.org/stable/c/5cd5207de519ef0c085f4f559adf5eefcb4c5202Patch

Published

Jul 19, 2026

Last Modified

Aug 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-64153In the Linux kernel, the following vulnerability has been re…8.8
• CVE-2026-64154In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64155In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64156In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64157In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64158Rejected reason: This CVE ID has been rejected or withdrawn …
• CVE-2026-6416Tanium addressed an uncontrolled resource consumption vulner…4.9
• CVE-2026-64160In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-64161In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64162In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-64163In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-64164In the Linux kernel, the following vulnerability has been re…5.5