EUVD-2026-27608CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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4DescriptionNVD
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".
AnalysisAI
Null pointer dereference in Linux kernel ICMP probe handling crashes systems when IPv6 module is configured but not loaded. The icmp_build_probe() function fails to validate ERR_PTR(-EAFNOSUPPORT) from ipv6_stub->ipv6_dev_find(), passing the error pointer directly to dev_hold() and triggering immediate kernel panic. …
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RemediationAI
Within 24 hours: Identify all Linux systems running kernels 6.6.0-6.6.135, 6.12.0-6.12.82, 6.18.0-6.18.23, 6.19.0-6.19.13, or 7.0.0-7.0.x with IPv6 module enabled; prioritize customer-facing and critical infrastructure. Within 7 days: Apply vendor-released patches (kernel 6.6.136, 6.12.83, 6.18.24, 6.19.14, or 7.0.x-patched versions per your distribution). …
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