CVE-2026-64116

In the Linux kernel, the following vulnerability has been resolved: ipv6: ioam: add NULL check for idev in ipv6_hop_ioam() Reported by Sashiko: The function ipv6_hop_ioam() accesses __in6_dev_get(skb->dev)->cnf.ioam6_enabled without validating the returned idev pointer. Because addrconf_ifdown() can concurrently clear dev->ip6_ptr via RCU, __in6_dev_get() can return NULL during interface teardown, which could cause a NULL pointer dereference when processing an IOAM Hop-by-Hop option. Let's add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a
https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38
https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963
https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59
https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8
https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2
https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9

Configurations

No configuration.

History

20 Jul 2026, 15:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

19 Jul 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-19 16:17

Updated : 2026-07-20 15:17

NVD link : CVE-2026-64116

Mitre link : CVE-2026-64116

CVE.ORG link : CVE-2026-64116

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-64116", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "c7e8971abd70e9d022f1c251ba2508f8dc7f2db8", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "09cbfd4b81ae90963dadb1de99b63b702e73290a", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "1dca7e491f070ac49b3d934f16ee953a53b37f38", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "902daac307eb7e1955ce05b071950f3cba88c963", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "abdd03229414b5a52943b65a60f34b84cea5ac59", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "cf75eb6617042c8cff6112daeed7791809fc9dd2", "versionType": "git"}, {"status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9", "versionType": "git"}], "programFiles": ["net/ipv6/exthdrs.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/exthdrs.c"], "defaultStatus": "affected"}]}], "published": "2026-07-19T16:17:53.103", "references": [{"url": "https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: add NULL check for idev in ipv6_hop_ioam()\n\nReported by Sashiko:\n\nThe function ipv6_hop_ioam() accesses\n__in6_dev_get(skb->dev)->cnf.ioam6_enabled without validating the returned\nidev pointer. Because addrconf_ifdown() can concurrently clear dev->ip6_ptr\nvia RCU, __in6_dev_get() can return NULL during interface teardown, which\ncould cause a NULL pointer dereference when processing an IOAM Hop-by-Hop\noption.\n\nLet's add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly."}], "lastModified": "2026-07-20T15:17:10.437", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}