PT-2026-61185 · Linux · Linux

CVE-2026-63868

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Publicado

2026-07-19

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Atualizado

2026-07-19

Nenhuma

Não há classificações de severidade ou métricas disponíveis. Quando houver, atualizaremos as informações correspondentes na página.
In the Linux kernel, the following vulnerability has been resolved:
net: garp: fix unsigned integer underflow in garp pdu parse attr
The receive-side GARP attribute parser computes dlen with reversed operands:
dlen = sizeof(*ga) - ga->len;
ga->len is the on-wire attribute length and includes the GARP attribute header. For normal attributes with data, ga->len is larger than sizeof(*ga), so the subtraction underflows in unsigned arithmetic.
The resulting value is later passed to garp attr lookup(), whose length argument is u8. After truncation, the parsed data length usually no longer matches the length stored for locally registered attributes, so received Join/Leave events are ignored. This breaks the GARP receive path for common attributes, such as GVRP VLAN registration attributes.
Compute the data length as the attribute length minus the header length.
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Identificadores relacionados

CVE-2026-63868

Produtos afetados

Linux