Bug 2540184 (CVE-2026-93210) - CVE-2026-93210 kernel: smb: client: harden DFS cache against invalid target hints
Summary: CVE-2026-93210 kernel: smb: client: harden DFS cache against invalid target h...
Keywords:
Status: NEW
Alias: CVE-2026-93210
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-24 15:22 UTC by OSIDB Bzimport
Modified: 2026-10-20 13:03 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-24 15:22:01 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-09-25 08:21:57 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93210.mbox
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