bpf: Fix overflow of jump offset in constant blinding

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Summary

CVECVE-2026-98816
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:35 UTC
Updated2026-10-19 10:19:45 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix overflow of jump offset in constant blinding bpf_jit_blind_insn() rewrites 'if rX op imm goto off' into: AX = imm ^ rnd AX ^= rnd if rX op AX goto off and subtracts 2 from off when the jump is backward. off is s16, so -32767 and -32768 wrap and the jump goes 32767 insns forward, past the end of the prog. The jump is inside the patch, hence bpf_adj_branches() doesn't check it. The kernel crashes when such prog runs with bpf_jit_harden=2. Return -ERANGE in such case. bpf_jit_blind_constants() fails the same way when blinding of other insns moves a jump out of range.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4f3446bb809f20ad56cadf712e6006815ae7a8f9 443328237113ee0ea515e506497334d871dbc2aa git Not specified
CNA Linux Linux affected 4f3446bb809f20ad56cadf712e6006815ae7a8f9 ad139384ecddb6f3e7e3c3c12765aafae0e39670 git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/443328237113ee0ea515e506497334d871dbc2aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad139384ecddb6f3e7e3c3c12765aafae0e39670 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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