Bug 2541216 (CVE-2026-98089) - CVE-2026-98089 kernel: bonding: alb: fix uninitialized transport header access in alb_determine_nd()
Summary: CVE-2026-98089 kernel: bonding: alb: fix uninitialized transport header acces...
Keywords:
Status: NEW
Alias: CVE-2026-98089
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-25 11:03 UTC by OSIDB Bzimport
Modified: 2026-11-01 00:43 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-25 11:03:30 UTC
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().


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