Access of Resource Using Incompatible Type ('Type Confusion') Affecting kernel-debug-devel-matched package, versions <0:6.12.0-211.22.1.el10_2


Severity

Recommended
critical

Based on CentOS security rating.

Threat Intelligence

EPSS
0.1% (27th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about Access of Resource Using Incompatible Type ('Type Confusion') vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-CENTOS10-KERNELDEBUGDEVELMATCHED-16361012
  • published4 May 2026
  • disclosed1 May 2026

Introduced: 1 May 2026

CVE-2026-43037  (opens in a new tab)
CWE-843  (opens in a new tab)

How to fix?

Upgrade Centos:10 kernel-debug-devel-matched to version 0:6.12.0-211.22.1.el10_2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel-matched package and not the kernel-debug-devel-matched package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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

ip6_tunnel: clear skb2->cb[] in ip4ip6_err()

Oskar Kjos reported the following problem.

ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr value. __ip_options_echo() then reads optlen from attacker-controlled packet data at sptr[rr+1] and copies that many bytes into dopt->__data, a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).

To fix this we clear skb2->cb[], as suggested by Oskar Kjos.

Also add minimal IPv4 header validation (version == 4, ihl >= 5).

CVSS Base Scores

version 3.1