CVE-2026-43070
HighSummary
W jądrze systemu Linux zidentyfikowano podatność związaną z operacją BPF_END, która nieprawidłowo nie resetuje identyfikatora rejestru. To może prowadzić do błędnych wniosków o wartościach rejestrów, co stwarza ryzyko dostępu do pamięci poza dozwolonym zakresem.
Risk Assessment
Organizacja może być narażona na nieautoryzowany dostęp do pamięci, co może prowadzić do poważnych problemów z bezpieczeństwem i stabilnością systemu. Potencjalne wykorzystanie tej podatności może skutkować naruszeniem integralności danych.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której naprawiono tę podatność. Należy również przeprowadzić audyt kodu, aby upewnić się, że podobne problemy nie występują w innych częściach systemu.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Reset register ID for BPF_END value tracking When a register undergoes a BPF_END (byte swap) operation, its scalar value is mutated in-place. If this register previously shared a scalar ID with another register (e.g., after an `r1 = r0` assignment), this tie must be broken. Currently, the verifier misses resetting `dst_reg->id` to 0 for BPF_END. Consequently, if a conditional jump checks the swapped register, the verifier incorrectly propagates the learned bounds to the linked register, leading to false confidence in the linked register's value and potentially allowing out-of-bounds memory accesses. Fix this by explicitly resetting `dst_reg->id` to 0 in the BPF_END case to break the scalar tie, similar to how BPF_NEG handles it via `__mark_reg_known`.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS