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Vulnerability record · CVE-2026-43099 · published 6 May 2026

CVE-2026-43099: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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".

7.5 CVSS 3.1 High EPSS 0.70% · top 48.8% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0f21bc261e60f0c696c58841c4873ff77ed83673
https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d Patch
https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 Patch
https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48 Patch
https://git.kernel.org/stable/c/dc5db4db19766a61ad65d81d1f55b1c1e51ba78d
https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964 Patch
https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43099), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.