CVE-2026-43038 - Vulnerability Analysis

Overview

Linux kernel contains a memory corruption vulnerability caused by improper clearing of skb2->cb[] in ip6_err_gen_icmpv6_unreach(), letting remote attackers craft forged ICMPv4 error packets with CIPSO IP options to cause out-of-bounds memory access, exploit requires sending specially crafted ICMPv4 packets.

Severity & Score

Impact

Remote attackers can cause out-of-bounds memory access, potentially leading to kernel memory corruption or denial of service.

Mitigation

Update to the latest Linux kernel version containing the patch that clears skb2->cb[] in ip6_err_gen_icmpv6_unreach()

References

• https://git.kernel.org/stable/c/3d5127d998de617b130aae96b138dba22ac6a8a7
• https://git.kernel.org/stable/c/86ab3e55673a7a49a841838776f1ab18d23a67b5
• https://git.kernel.org/stable/c/a2edbb6393972a02114b6003953a5cef3104fada
• https://git.kernel.org/stable/c/a4437faf135da293d16fcc4cc607316742bd0ebb
• https://git.kernel.org/stable/c/c438ba010171b70bad22fc18b1d5bdc3627476e8
• https://git.kernel.org/stable/c/e41953e7d118e2702bcb217879c173d9d1d3cd4e
• https://git.kernel.org/stable/c/0452b6526b2f54b2413b9cb4ff1ea2ac542c99c7
• https://git.kernel.org/stable/c/1ceeebd5bd6d855b17a5df625109bfe29129d7cf

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner