CVE-2026-93148

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Reject MEM_ALLOC BTF accesses past object bounds

BTF struct walks relax the struct-size check for accesses through a trailing flexible array. That is valid for ordinary BTF type walking, but PTR_TO_BTF_ID | MEM_ALLOC values point to objects allocated with the static BTF type size.

When walking a MEM_ALLOC object, reject the access before applying the flexible-array relaxation if the access range extends past the struct size. Apply the same policy to struct ID matching so kfunc and kptr type checks do not walk past the allocated object bounds either.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux958cf2e273f0929c66169e0788031310e8118722 < e626a50d07d43421cbf7bfb5a084b33a5e276b6eaffected
LinuxLinux958cf2e273f0929c66169e0788031310e8118722 < 9c9ee0324c774490ae953162aaaf4561d222bd93affected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References