CVE-2026-98048

Summary

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

bpf: don't rewrite bpf_fastcall patterns entered by a jump

mark_fastcall_pattern_for_call() must ensure that matched "spill; call; fill" instruction series is not interrupted by a jump. Otherwise the rewrite applied by bpf_remove_fastcall_spills_fills() is not sound.

Record the instructions targeted by jumps in insn_aux_data[*].jump_target when the CFG is built and use this flag to stop growing a pattern at such an instruction. Jumps to the first spill are fine.

Note that existing insn_aux_data[*].jmp_point field can't be reused, as it marks subprogram return instructions.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/24adbc2c3bbe3385ce922587e1f8e837a68b3e25
• https://git.kernel.org/stable/c/0b1c83dc3c4401cd7e846548f62e3caf3d06742e

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