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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
98d7ca374ba4b39e7535613d40e159f09ca14da2 to < 1509c1ae9185ec7103899967ed788b6eebab3fccaffected98d7ca374ba4b39e7535613d40e159f09ca14da2 to < d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066affected98d7ca374ba4b39e7535613d40e159f09ca14da2 to < cc86a8b0a1c54d2bccf6f68cf49b82dea91b84deaffected98d7ca374ba4b39e7535613d40e159f09ca14da2 to < d7f14173c0d5866c3cae759dee560ad1bed10d2eaffected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.12.105 to ≤ 6.12.*unaffected6.18.33 to ≤ 6.18.*unaffected7.0.10 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/1509c1ae9185ec7103899967ed788b6eebab3fcc ↗
- https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066 ↗
- https://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de ↗
- https://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e ↗
- 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 ↗