What’s Vulnerable › Vulnerabilities

CVE-2024-35863: smb: client: fix potential UAF in is_valid_oplock_break()

• Severity: high (CVSS 7.8 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: 2024-05-19 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in is_valid_oplock_break() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.

Affected products

• Linux kernel: from 6.0 before 6.1.85; from 6.2 before 6.6.26; from 6.7 before 6.8.5; 6.9-rc1, 6.9-rc2 — fixed in 6.1.85, 6.6.26, 6.8.5

How to fix

Upgrade to a fixed version: Linux kernel 6.1.85, 6.6.26, 6.8.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a15ba88a32fa7a516aff7ffd27befed5334dff2
• https://git.kernel.org/stable/c/16d58c6a7db5050b9638669084b63fc05f951825
• https://git.kernel.org/stable/c/494c91e1e9413b407d12166a61b84200d4d54fac
• https://git.kernel.org/stable/c/69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29
• https://git.kernel.org/stable/c/0a15ba88a32fa7a516aff7ffd27befed5334dff2
• https://git.kernel.org/stable/c/16d58c6a7db5050b9638669084b63fc05f951825
• https://git.kernel.org/stable/c/494c91e1e9413b407d12166a61b84200d4d54fac
• https://git.kernel.org/stable/c/69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29

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