Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: fix null-ptr-deref in icmp_build_probe() ipv6_stub->ipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the IPv6 stack is not active (CONFIG_IPV6=m and not loaded), and passing this error pointer to dev_hold() will cause a kernel crash with null-ptr-deref. Instead, silently discard the request. RFC 8335 does not appear to define a specific response for the case where an IPv6 interface identifier is syntactically valid but the implementation cannot perform the lookup at runtime, and silently dropping the request may safer than misreporting "No Such Interface".
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.13, < 6.6.136 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4dPatch
- https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5Patch
- https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48Patch
- https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964Patch
- https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8Patch
FAQ
What is CVE-2026-43099?
CVE-2026-43099 is a vulnerability with a CVSS score of 7.5 (HIGH). In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: fix null-ptr-deref in icmp_build_probe() ipv6_stub->ipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the IPv6 st...
How severe is CVE-2026-43099?
CVE-2026-43099 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43099?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.