What’s Vulnerable › Vulnerabilities

CVE-2026-89636: smb: client: clear ce->tgthint in free_tgts()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all structures in ce->tlist, ce->tgthint is left pointing to one of the freed cache_dfs_tgt structures. If ce->tgthint is not reset before it is used later, it results in a use-after-free. Set ce->tgthint to NULL in free_tgts() after the elements are freed to reflect that no elements remain.

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/14f60e959b5ac813715ff72e127beb3584ddabf6
• https://git.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55
• https://git.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984
• https://git.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3
• https://git.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624fa
• https://git.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700

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