What’s Vulnerable › Vulnerabilities

CVE-2026-100074: bpf: Mark bpf_refcount field as unique

• 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: 2026-09-25 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf_refcount field as unique BPF_REFCOUNT is not marked as a unique field, while it should be. Fix this oversight.

Affected products

• Linux kernel: from 6.4 before 6.18.52; from 6.19 before 7.2.6 — fixed in 6.18.52, 7.2.6

How to fix

Upgrade to a fixed version: Linux kernel 6.18.52, 7.2.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/015f9fbcf3382c5eb563a157ee8cabb6fbfcfe5e
• https://git.kernel.org/stable/c/20b3c72c1b83054c568d2322a95e217fdc281bc3
• https://git.kernel.org/stable/c/61e655391cb19c31f94ecd4354f624c81ce4cf75
• https://git.kernel.org/stable/c/641f814965d733936ca3618d4d5a12a8fa9be00e
• https://git.kernel.org/stable/c/e42cede6f90177f4f92f80d3de18f628e61d2087

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