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

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Summary

CVECVE-2026-43099
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:23 UTC
Updated2026-05-11 17:36:29 UTC
DescriptionIn 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".

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000680000 probability, percentile 0.208310000 (date 2026-05-12)

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 47a8bf52156ac7e7a581eca31c1f964ba4258d4d git Not specified
CNA Linux Linux affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 6be325206850a0891896d38bcf83a09d8b54ec48 git Not specified
CNA Linux Linux affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 f91b3ed9e7fa82a70511b5f6901c88379acf2964 git Not specified
CNA Linux Linux affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 git Not specified
CNA Linux Linux affected d329ea5bd8845f0b196bf41b18b6173340d6e0e4 fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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