CVE-2024-42072

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix may_goto with negative offset. Zac's syzbot crafted a bpf prog that exposed two bugs in may_goto. The 1st bug is the way may_goto is patched. When offset is negative it should be patched differently. The 2nd bug is in the verifier: when current state may_goto_depth is equal to visited state may_goto_depth it means there is an actual infinite loop. It's not correct to prune exploration of the program at this point. Note, that this check doesn't limit the program to only one may_goto insn, since 2nd and any further may_goto will increment may_goto_depth only in the queued state pushed for future exploration. The current state will have may_goto_depth == 0 regardless of number of may_goto insns and the verifier has to explore the program until bpf_exit.

• https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939Patch
• https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103Patch
• https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939Patch
• https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103Patch

Published

Jul 29, 2024

Last Modified

Aug 4, 2026

Status

Modified

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