CVE-2026-98089

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 < e39cf90bd856443542b97933289749fca07476bfaffected
LinuxLinux0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 < 27314f96d29b54e815e7a9b84c3273f1895e68e2affected
LinuxLinux0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 < 3b178894931a268c09126a5b53630f343e10e296affected
LinuxLinux0da8aa00bfcfeb3f4e6537dd8e2001e0727ba549 < 70f3995830d3f1e79faa14eb0605914f778feca9affected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References