What’s Vulnerable › Vulnerabilities

CVE-2021-46908: bpf: Use correct permission flag for mixed signed bounds arithmetic

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2024-02-27 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Use correct permission flag for mixed signed bounds arithmetic We forbid adding unknown scalars with mixed signed bounds due to the spectre v1 masking mitigation. Hence this also needs bypass_spec_v1 flag instead of allow_ptr_leaks.

Affected products

• Linux kernel: from 5.8.0 before 5.10.32; from 5.11.0 before 5.11.16 — fixed in 5.10.32, 5.11.16

How to fix

Upgrade to a fixed version: Linux kernel 5.10.32, 5.11.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4ccdc6c6cae38b91c871293fb0ed8c6845a61b51
• https://git.kernel.org/stable/c/4f3ff11204eac0ee23acf64deecb3bad7b0db0c6
• https://git.kernel.org/stable/c/9601148392520e2e134936e76788fc2a6371e7be
• https://git.kernel.org/stable/c/4ccdc6c6cae38b91c871293fb0ed8c6845a61b51
• https://git.kernel.org/stable/c/4f3ff11204eac0ee23acf64deecb3bad7b0db0c6
• https://git.kernel.org/stable/c/9601148392520e2e134936e76788fc2a6371e7be

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