In the Linux kernel, the following vulnerability has been resolved:
smb/client: flush dirty data before punching a hole
Punching a hole after a large buffered write may leave the range reported as data. Reproduce it with:
xfs_io -f \ -c "pwrite -b 3m -S 0x61 0 3m" \ -c "fpunch 1m 1m" \ -c "seek -h 0" \ -c "seek -d 1m" \ /mnt/test/repro
Punching 1 MiB at offset 1 MiB should produce:
0 1 MiB 2 MiB 3 MiB | DATA | HOLE | DATA | EOF
Instead, the entire file is reported as data. SEEK_HOLE(0) returns EOF, and SEEK_DATA(1M) returns 1M.
This happens because a dirty folio spanning the punched range can be written back after the punch and refill the hole.
Fix this by flushing and waiting for dirty data in the punched range before invalidating the page cache and issuing FSCTL_SET_ZERO_DATA.
The xfstests generic/539 pass against Samba/ksmbd with this change.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.12.111-136.204Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12Upgrade perf6.12Upgrade kernel6.12-headersUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-develUpgrade bpftool6.12-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-develUpgrade kernel6.12-toolsUpgrade perf6.12-debuginfoUpgrade bpftool6.12 | Oct 13, 2026 | Sep 24, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 24, 2026 |
| Redhat_linux | — | No solution exists | Sep 30, 2026 | Sep 24, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Sep 24, 2026 |
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