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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-93794

smb/client: flush dirty data before punching a hole

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 31742c5a331766bc7df6b0d525df00c6cd20d5a6 to < 0c9fcab9bf1ef3516983f3de05a19c5658c7a01eaffected
  • 31742c5a331766bc7df6b0d525df00c6cd20d5a6 to < 216e469586057c29409e4ef8311d282388c6e251affected
  • 31742c5a331766bc7df6b0d525df00c6cd20d5a6 to < 6c265aca08155e519a8f6f6071c59dff4f535f70affected
  • 31742c5a331766bc7df6b0d525df00c6cd20d5a6 to < 39562a56cdb515f6635c3e7bfe6629439b18a169affected
  • 31742c5a331766bc7df6b0d525df00c6cd20d5a6 to < d7d2adcd022baade5cab65ca492ce63421ce3a6eaffected

Linux Linux

Default version status: affected

  • 3.17affected
  • 0 to < 3.17unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2 to ≤ *unaffected

References