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CVE-2026-92515: bpf: Preserve unique-field state across nested structs

• Severity: unknown
• 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve unique-field state across nested structs btf_find_struct_field() initializes a fresh seen mask for every recursive descent. Unique special fields in different levels of the same aggregate therefore do not see one another. The duplicate fields can reach btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A crafted user BTF can consequently trigger the warning before map creation checks capabilities. Initialize the seen mask once in btf_find_field() and pass the same pointer through struct, datasec, and nested-struct walks. This gives the entire field traversal one shared uniqueness state.

Affected products

• Linux kernel: 6.11 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28d5f20ed022ade0fb0bfbf50b78fec782083175
• https://git.kernel.org/stable/c/373a1e9366e711b89bc5e45bd6edf33ef62402cd
• https://git.kernel.org/stable/c/cec97102d4147e18568c93946014c4c8ebf86fcf
• https://git.kernel.org/stable/c/f08619f060468076e4acbdc10e0713af20d60e65

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