All vulnerabilities
CVE-2026-98685

Linux: smb: client: discard post-EOF pagecache when extending a file via clone range

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15bb9f1d3e967e328649e92a1451e60a0dc66118Also 4721587f96cb8de8164f3fd203093a0875560999, 6.2 and 1 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

smb: client: discard post-EOF pagecache when extending a file via clone range

cifs_remap_file_range() discarded the pagecache only for the folios overlapping the destination region, so when a clone extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended.

Start the discard at the smaller of fstart and the old EOF. i_size is still old here, so nothing past the old EOF is flushed to the server.

Text from CVE List

Affected versions 10

  • Linuxaffected: c54fc3a4f375663f2361a9cbb2955fb4ef912879 before 15bb9f1d3e967e328649e92a1451e60a0dc66118CVE List
  • Linuxaffected: c54fc3a4f375663f2361a9cbb2955fb4ef912879 before 4721587f96cb8de8164f3fd203093a0875560999CVE List
  • Linuxaffected: 358bd5f436d820bb758833050aae065b35d6986cCVE List
  • Linuxaffected: 43801359c8971cc49b4a4db5015fba77fbd09c32CVE List
  • Linuxaffected: 6.1.68 before 6.2CVE List
  • Linuxaffected: 6.6.7 before 6.7CVE List
  • Linuxaffected: 6.7CVE List
  • Linuxunaffected: all versions before 6.7CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 2