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

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Summary

CVECVE-2026-98048
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:33 UTC
Updated2026-09-25 11:17:33 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.039790000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5b5f51bff1b66cedb62b5ba74a1878341204e057 24adbc2c3bbe3385ce922587e1f8e837a68b3e25 git Not specified
CNA Linux Linux affected 5b5f51bff1b66cedb62b5ba74a1878341204e057 0b1c83dc3c4401cd7e846548f62e3caf3d06742e git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0b1c83dc3c4401cd7e846548f62e3caf3d06742e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/24adbc2c3bbe3385ce922587e1f8e837a68b3e25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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