What’s Vulnerable › Vulnerabilities

CVE-2026-43378: smb: server: fix use-after-free in smb2_open()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: smb: server: fix use-after-free in smb2_open() The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is dereferenced after rcu_read_unlock(), creating a use-after-free window.

Affected products

• Linux kernel: from 5.15 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2, 7.0-rc3 — fixed in 6.1.167, 6.12.78, 6.18.19, 6.19.9, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.78, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718a
• https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680
• https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909c
• https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07
• https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556
• https://git.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc

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