CVE-2026-43099

ipv4: icmp: fix null-ptr-deref in icmp_build_probe()

State: Published
Severity: 7.5 High
Published: May 6, 2026
Updated: Oct 15, 2026
Reserved: May 1, 2026

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".

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 0f21bc261e60f0c696c58841c4873ff77ed83673Affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before dc5db4db19766a61ad65d81d1f55b1c1e51ba78dAffected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 47a8bf52156ac7e7a581eca31c1f964ba4258d4dAffected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 6be325206850a0891896d38bcf83a09d8b54ec48Affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before f91b3ed9e7fa82a70511b5f6901c88379acf2964Affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5Affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before fde29fd9349327acc50d19a0b5f3d5a6c964dfd8Affected
LinuxLinux	5.13Affected before 5.13Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.136 through 6.6.Not affected 6.12.83 through 6.12.Not affected 6.18.24 through 6.18.Not affected 6.19.14 through 6.19.Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 0f21bc261e60f0c696c58841c4873ff77ed83673Affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before dc5db4db19766a61ad65d81d1f55b1c1e51ba78dAffected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 47a8bf52156ac7e7a581eca31c1f964ba4258d4dAffected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 6be325206850a0891896d38bcf83a09d8b54ec48Affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before f91b3ed9e7fa82a70511b5f6901c88379acf2964Affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5Affected
d329ea5bd8845f0b196bf41b18b6173340d6e0e4 to before fde29fd9349327acc50d19a0b5f3d5a6c964dfd8Affected

LinuxLinux

5.13Affected
before 5.13Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.136 through 6.6.*Not affected
6.12.83 through 6.12.*Not affected
6.18.24 through 6.18.*Not affected
6.19.14 through 6.19.*Not affected
7.0 and laterNot affected

References

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