CVE-2026-31525

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

bpf: Fix undefined behavior in interpreter sdiv/smod for INT_MIN

The BPF interpreter's signed 32-bit division and modulo handlers use

the kernel abs() macro on s32 operands. The abs() macro documentation

(include/linux/math.h) explicitly states the result is undefined when

the input is the type minimum. When DST contains S32_MIN (0x80000000),

abs((s32)DST) triggers undefined behavior and returns S32_MIN unchanged

on arm64/x86. This value is then sign-extended to u64 as

0xFFFFFFFF80000000, causing do_div() to compute the wrong result.

The verifier's abstract interpretation (scalar32_min_max_sdiv) computes

the mathematically correct result for range tracking, creating a

verifier/interpreter mismatch that can be exploited for out-of-bounds

map value access.

Introduce abs_s32() which handles S32_MIN correctly by casting to u32

before negating, avoiding signed overflow entirely. Replace all 8

abs((s32)...) call sites in the interpreter's sdiv32/smod32 handlers.

s32 is the only affected case -- the s64 division/modulo handlers do

not use abs().