What’s Vulnerable › Vulnerabilities

CVE-2026-93210: smb: client: harden DFS cache against invalid target hints

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.0 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/66dbcdbb0cadffd12eb8f2b115fd57d384c5109d
• https://git.kernel.org/stable/c/6cb7f9fed8f40f28fbd464ca99c946951afc0952
• https://git.kernel.org/stable/c/7e32da6047d9afdae8dd17b87b4c8d97363c4ee2
• https://git.kernel.org/stable/c/846f0709559b9e27024e126a80bc7afb76516912
• https://git.kernel.org/stable/c/a48328afbc3f63e3b9de8827e2e16c15b17976f7
• https://git.kernel.org/stable/c/bf86c08123c6ab8c61cc0be1dad7540db93738ff

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