CVE-2026-80839: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject unrepresentable multicast TVLV offsets The network and transport header fields in struct sk_buff are 16-bit offsets from skb->head, and U16_MAX is reserved as the unset transport header value. batadv_tvlv_call_handler() sets both fields from a received multicast TVLV without checking whether the TVLV end is representable. If the end offset exceeds the field's range, skb_set_transport_header() truncates it so that the transport header precedes the network header. The negative difference is then returned by skb_network_header_len() as a large u32. batadv_mcast_forw_packet() consequently accepts an oversized multicast tracker and accesses memory beyond the skb data. Add skb_set_transport_header_careful(), an offset-aware counterpart to skb_reset_transport_header_careful(), which validates the final head-relative offset before assigning it. Use the new helper in batadv_tvlv_call_handler() and reject unrepresentable TVLVs before setting the network header.

Засегнати продукти

• Linux Linux: 07afe1ba288c04280622fa002ed385f1ac0b6fe6 преди da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2; 07afe1ba288c04280622fa002ed385f1ac0b6fe6 преди 916ec741e65af072b98e475feaad98c063da1b7c; 07afe1ba288c04280622fa002ed385f1ac0b6fe6 преди 1b466746fe109127fd983100a228cdd1f1f6ece2; 07afe1ba288c04280622fa002ed385f1ac0b6fe6 преди 2b46baa591d0a7c16b62f150917187e70d053be6; 07afe1ba288c04280622fa002ed385f1ac0b6fe6 преди f12c2de4f542e3220e17e0606f492110064f04cb
• Linux Linux: 6.8; преди 6.8; 6.12.108 до 6.12.*; 6.18.49 до 6.18.*; 7.1.13 до 7.1.*; 7.2.3 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-80839
• https://nvd.nist.gov/vuln/detail/CVE-2026-80839
• https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2
• https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c
• https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2
• https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6
• https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb