What’s Vulnerable › Vulnerabilities

CVE-2026-43239: smb: client: prevent races in ->query_interfaces()

• Severity: high (CVSS 8.8 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: 2026-05-06 · updated 2026-10-30
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: prevent races in ->query_interfaces() It was possible for two query interface works to be concurrently trying to update the interfaces. Prevent this by checking and updating iface_last_update under iface_lock.

Affected products

• Linux kernel: from 5.19.1 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 5.19-rc4, 5.19-rc5, 5.19-rc6, 5.19-rc7, 5.19-rc8; 5.19 — fixed in 6.6.128, 6.12.75, 6.18.16, 6.19.6
• Linux: 5.19 — fixed in 7.0

How to fix

Upgrade to a fixed version: Linux kernel 6.6.128, 6.12.75, 6.18.16, 6.19.6; Linux 7.0. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5
• https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8
• https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3
• https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d
• https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489
• https://git.kernel.org/stable/c/de3c1653510d566a245cc54ac4bb9e50ebc5faa8

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