CVE-2026-43099
ipv4: icmp: fix null-ptr-deref in icmp_build_probe()
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".
INFO
Published Date :
May 6, 2026, 10:16 a.m.
Last Modified :
May 8, 2026, 1:16 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the kernel patch for the described issue.
- Update the Linux kernel to a fixed version.
- Ensure IPv6 module is loaded if needed.
References to Advisories, Solutions, and Tools
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CVE-2026-43099.
CWE - Common Weakness Enumeration
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weaknesses that can lead to vulnerabilities. CVE-2026-43099 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43099
weaknesses.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 06, 2026
Action Type Old Value New Value Added 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". Added Reference https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d Added Reference https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 Added Reference https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48 Added Reference https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964 Added Reference https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8