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CVE-2026-43501 is a Linux kernel vulnerability in the IPv6 RPL source routing header handling path, specifically in ipv6_rpl_srh_rcv(). The function decompresses an RFC 6554 Source Routing Header (SRH), swaps the next segment into ipv6_hdr->daddr, recompresses the SRH, then removes the old header and pushes the new SRH plus the IPv6 header back onto the skb. The flaw arises because the recompressed SRH can be larger than the received SRH when the segment swap reduces the common-prefix length shared with daddr; the maximum documented growth is 8 bytes under conditions such as CmprI=0, CmprE>0, and seg[0][0] != daddr[0]. The vulnerable logic only called pskb_expand_head() when segments_left == 0, so on earlier segments skb_push() could consume headroom without ensuring enough remaining space for subsequent MAC header reconstruction. If skb_push() leaves fewer than skb->mac_len bytes before skb->data, skb_mac_header_rebuild() calls skb_set_mac_header(skb, -skb->mac_len), causing the u16 mac_header field to wrap to a value near 65530. A following memmove() then writes skb->mac_len bytes roughly 64 KiB past skb->head, producing an out-of-bounds kernel write. The issue was reproduced with a single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over the loopback interface using a two-segment type-3 SRH with CmprI=0 and CmprE=15; KASAN reported a 14-byte out-of-bounds write in ipv6_rthdr_rcv.
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Referenced as one of many vulnerabilities solved by SUSE security updates; no technical details provided in the content.
A Linux kernel IPv6 RPL Source Routing Header handling flaw that can cause an out-of-bounds write when a recompressed SRH grows and insufficient headroom is available, leading to memory corruption in packet processing.
A specific vulnerability identified as CVE-2026-43501 is referenced in repository or pull request metadata indicating exploit-related work and documentation are being added, but no technical description of the flaw itself is provided.
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