bpf: Fix linked reg delta tracking when src_reg == dst_reg

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Summary

CVECVE-2026-53092
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:23 UTC
Updated2026-06-24 17:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix linked reg delta tracking when src_reg == dst_reg Consider the case of rX += rX where src_reg and dst_reg are pointers to the same bpf_reg_state in adjust_reg_min_max_vals(). The latter first modifies the dst_reg in-place, and later in the delta tracking, the subsequent is_reg_const(src_reg)/reg_const_value(src_reg) reads the post-{add,sub} value instead of the original source. This is problematic since it sets an incorrect delta, which sync_linked_regs() then propagates to linked registers, thus creating a verifier-vs-runtime mismatch. Fix it by just skipping this corner case.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066 git Not specified
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de git Not specified
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 d7f14173c0d5866c3cae759dee560ad1bed10d2e git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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