CVE-2026-98089
Description
In the Linux kernel, the following vulnerability has been resolved: bonding: alb: fix uninitialized transport header access in alb_determine_nd() alb_determine_nd() uses icmp6_hdr(skb) to inspect ICMPv6 headers. However, in xmit paths (e.g. packets sent via AF_PACKET / raw sockets or forwarded packets), skb->transport_header is not guaranteed to be initialized. While pskb_network_may_pull() ensures the packet data is linear starting from the network header, it does not set or adjust the transport header offset. Dereferencing icmp6_hdr(skb) can therefore access out-of-bounds memory. Fetch the icmp6hdr directly after ipv6hdr following pskb_network_may_pull(), and reload ipv6hdr in case pskb_may_pull() reallocated skb->head. Also remove the unused bond argument from alb_determine_nd().
How to fix
- Linux Linux862c8eb6947689c44fe11353755576a3672563a5, 7adb1bf25b0c5cedfb49b6e82844394d4f3c0d99, e39cf90bd856443542b97933289749fca07476bf, 27314f96d29b54e815e7a9b84c3273f1895e68e2, 3b178894931a268c09126a5b53630f343e10e296, 70f3995830d3f1e79faa14eb0605914f778feca9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < 862c8eb6947689c44fe11353755576a3672563a5, 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < 7adb1bf25b0c5cedfb49b6e82844394d4f3c0d99, 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < e39cf90bd856443542b97933289749fca07476bf, 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < 27314f96d29b54e815e7a9b84c3273f1895e68e2, 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < 3b178894931a268c09126a5b53630f343e10e296, 0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 ≤ v < 70f3995830d3f1e79faa14eb0605914f778feca9, 5.18 | 862c8eb6947689c44fe11353755576a3672563a5, 7adb1bf25b0c5cedfb49b6e82844394d4f3c0d99, e39cf90bd856443542b97933289749fca07476bf, 27314f96d29b54e815e7a9b84c3273f1895e68e2, 3b178894931a268c09126a5b53630f343e10e296, 70f3995830d3f1e79faa14eb0605914f778feca9 |
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