Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 07afe1ba288c04280622fa002ed385f1ac0b6fe6 before da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2; affected 07afe1ba288c04280622fa002ed385f1ac0b6fe6 before 916ec741e65af072b98e475feaad98c063da1b7c; affected 07afe1ba288c04280622fa002ed385f1ac0b6fe6 before 1b466746fe109127fd983100a228cdd1f1f6ece2; affected 07afe1ba288c04280622fa002ed385f1ac0b6fe6 before 2b46baa591d0a7c16b62f150917187e70d053be6; affected 07afe1ba288c04280622fa002ed385f1ac0b6fe6 before f12c2de4f542e3220e17e0606f492110064f04cb |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.12.108 through 6.12.*; unaffected 6.18.49 through 6.18.*; unaffected 7.1.13 through 7.1.*; unaffected 7.2.3 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- 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