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CVE-2026-98686VulnerabilityPublished Updated

Microsoft · smb: client: discard post-EOF pagecache when extending a file via zero range

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98686· High

Not known to be exploited · fixed in da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0 : patch Microsoft soon.

Data as of 7 Nov 2026, 12:35 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0, b75dadb50a25eed525264bf6fea44fad94e7626f, 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0
Fixed in
  • da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < b75dadb50a25eed525264bf6fea44fad94e7626f
Fixed in
  • b75dadb50a25eed525264bf6fea44fad94e7626f
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183
Fixed in
  • 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < 03408d15c5405f8dc3e1a114cdce2174027a85f6
Fixed in
  • 03408d15c5405f8dc3e1a114cdce2174027a85f6
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < 6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d
Fixed in
  • 6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d
LinuxLinuxAffected
  • ≥ 72c419d9b073628d3b5b0b2fc787b724f1a8c726, < 3df27277f8f95345d4a6c57367824bf1aefdbf66
Fixed in
  • 3df27277f8f95345d4a6c57367824bf1aefdbf66

Description

CVE-2026-98686 relates to the SMB client handling of the pagecache when extending a file via a zero range. The vulnerability involves discarding the post-EOF pagecache in this scenario. No detailed impact or exploitation information is provided.

References

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