CVE-2026-98096

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ipv6: sr: restore network header before routing and forwarding

ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)

while skb_network_header() points at the IPv6 header.

When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data

position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately

followed the fixed IPv6 header. If another extension header (such as a

Hop-by-Hop options header) precedes the SRH, skb_network_offset()

remained negative.

This led to two problems:

1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes

__skb_flow_dissect() which passes the negative skb_network_offset()

to flow dissection, breaking BPF and C flow dissector logic.

2. If forwarded via ip6_forward() or redirected via act_mirred, downstream

handlers (like sch_fragment() or neighbour output) pass the negative

offset as an unsigned length, triggering OOB memcpy or buf

/// Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// Affected products

/// References