CVE-2025-22048

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Don't override subprog's return value The verifier test `calls: div by 0 in subprog` triggers a panic at the ld.bu instruction. The ld.bu insn is trying to load byte from memory address returned by the subprog. The subprog actually set the correct address at the a5 register (dedicated register for BPF return values). But at commit 73c359d1d356 ("LoongArch: BPF: Sign-extend return values") we also sign extended a5 to the a0 register (return value in LoongArch). For function call insn, we later propagate the a0 register back to a5 register. This is right for native calls but wrong for bpf2bpf calls which expect zero-extended return value in a5 register. So only move a0 to a5 for native calls (i.e. non-BPF_PSEUDO_CALL).

• https://git.kernel.org/stable/c/223d565d8892481684091cfbaf3466f2b0e289d3Patch
• https://git.kernel.org/stable/c/60f3caff1492e5b8616b9578c4bedb5c0a88ed14Patch
• https://git.kernel.org/stable/c/780628a780b622759d9e5adc76d15432144da1a3Patch
• https://git.kernel.org/stable/c/7df2696256a034405d3c5a71b3a4c54725de4404Patch
• https://git.kernel.org/stable/c/996e90ab446641553e8e21707b38b9709605e0e0Patch

Published

Apr 16, 2025

Last Modified

Jul 30, 2026

Status

Modified

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