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CVE-2026-43038 is a Linux kernel networking vulnerability in the IPv6 ICMP error-generation path, specifically in ip6_err_gen_icmpv6_unreach(). The flaw occurs when an outer IPv4 ICMP error packet is cloned and the cloned skb is later processed as IPv6. The skb control buffer retains IPv4 inet_skb_parm state, but subsequent code interprets that same buffer as IPv6 inet6_skb_parm through IP6CB(skb2). Because fields overlap in memory, attacker-influenced IPv4 option state can be reinterpreted as the IPv6 dsthao offset. A forged ICMPv4 error carrying a CIPSO IP option can therefore cause icmp6_send() and mip6_addr_swap() to parse an attacker-controlled inner IPv6 packet at an unintended offset via ipv6_find_tlv(). In the vulnerable path, this can lead to acceptance of a fake Home Address option TLV without sufficient validation that enough packet data remains for the full ipv6_destopt_hao structure, creating a condition where mip6_addr_swap() may perform a 16-byte swap past the end of packet data into adjacent skb memory. The fix clears skb2->cb[] in ip6_err_gen_icmpv6_unreach() before the cloned skb is handed to IPv6 processing.
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A Linux kernel vulnerability in the IPv6 ICMP handling path, addressed by clearing skb2->cb[] in ip6_err_gen_icmpv6_unreach().
A Linux kernel vulnerability in the IPv6 ICMP handling path, described as clearing skb2->cb[] in ip6_err_gen_icmpv6_unreach().
Linux kernel vulnerability in ipv6/icmp related to clearing skb2->cb[] in ip6_err_gen_icmpv6_unreach().
Linux kernel vulnerability in IPv6 ICMP handling involving clearing skb2->cb[] in ip6_err_gen_icmpv6_unreach().
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Cross-references every affected SKU, including bundled OEM variants.
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