CVE-2026-92515

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux64e8ee814819f21beeeda00d4119221443d77992 < cec97102d4147e18568c93946014c4c8ebf86fcfaffected
LinuxLinux64e8ee814819f21beeeda00d4119221443d77992 < 28d5f20ed022ade0fb0bfbf50b78fec782083175affected
LinuxLinux64e8ee814819f21beeeda00d4119221443d77992 < 373a1e9366e711b89bc5e45bd6edf33ef62402cdaffected
LinuxLinux64e8ee814819f21beeeda00d4119221443d77992 < f08619f060468076e4acbdc10e0713af20d60e65affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References