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7.8 High

CVE-2026-53092 In the Linux kernel, the following vulnerability has been resolved: bpf: Fix linked reg delta tracking when src_reg ==…

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 and versions

Product Affected versions Fixed in
Linux 7.1 earliest → < 7.1 7.1
Linux 7.0 earliest → < 7.0.10 7.0.10
Linux 6.18 earliest → < 6.18.33 6.18.33
Linux 6.12 earliest → < 6.12.105 6.12.105
Linux 6.11 No fix stated
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
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Product Affected versions Fixed in
Red Hat Enterprise Linux 8 Versions not published

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