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CVE-2026-93210

Linux: smb: client: harden DFS cache against invalid target hints

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)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6cb7f9fed8f40f28fbd464ca99c946951afc0952Also 66dbcdbb0cadffd12eb8f2b115fd57d384c5109d, 846f0709559b9e27024e126a80bc7afb76516912 and 1 moreCVE List
Published24 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 6cb7f9fed8f40f28fbd464ca99c946951afc0952LinuxCVE List
  • 66dbcdbb0cadffd12eb8f2b115fd57d384c5109dLinuxCVE List
  • 846f0709559b9e27024e126a80bc7afb76516912LinuxCVE List
  • 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2LinuxCVE List

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: harden DFS cache against invalid target hints

Currently, get_tgt_name() returns ERR_PTR(-ENOENT) when ce->tgthint is NULL, and dfs_cache_noreq_update_tgthint() assumes ce->tgthint is always valid.

In preparation for clearing ce->tgthint in free_tgts(), harden callers of get_tgt_name() against ERR_PTR results and harden dfs_cache_noreq_update_tgthint() against NULL pointer dereferences.

Text from CVE List

Affected versions 14

  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before a48328afbc3f63e3b9de8827e2e16c15b17976f7CVE List
  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before 6cb7f9fed8f40f28fbd464ca99c946951afc0952CVE List
  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before 66dbcdbb0cadffd12eb8f2b115fd57d384c5109dCVE List
  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before 846f0709559b9e27024e126a80bc7afb76516912CVE List
  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2CVE List
  • Linuxaffected: 54be1f6c1c37498bba557049df646cc239fa37e3 before bf86c08123c6ab8c61cc0be1dad7540db93738ffCVE List
  • Linuxaffected: 5.0CVE List
  • Linuxunaffected: all versions before 5.0CVE List
  • Linuxunaffected: 6.1.188 through 6.1.*CVE List
  • Linuxunaffected: 6.6.157 through 6.6.*CVE List
  • Linuxunaffected: 6.12.109 through 6.12.*CVE List
  • Linuxunaffected: 6.18.50 through 6.18.*CVE List
  • Linuxunaffected: 7.2.4 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 6