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CVE-2026-53092: bpf: Fix linked reg delta tracking when src_reg == dst_reg

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-10-19
• Weakness: CWE-393

Description

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 products

• Linux kernel: from 6.11 before 6.18.33; from 6.19 before 7.0.10 — fixed in 6.18.33, 7.0.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.33, 7.0.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1509c1ae9185ec7103899967ed788b6eebab3fcc
• https://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de
• https://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e
• https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066
• 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

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