CVE-2026-53092

Summary

In 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.

Affected Software

Weaknesses

ADP Enrichment

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

Additional References

• https://access.redhat.com/security/cve/CVE-2026-53092
• https://bugzilla.redhat.com/show_bug.cgi?id=2492362
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53092.json

References

• https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066
• https://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de
• https://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e

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