{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64116", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.035Z", "datePublished": "2026-07-19T15:40:16.240Z", "dateUpdated": "2026-08-05T12:39:25.437Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:25.437Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in the IPv6 receive path (ipv6_rcv → ip6_rcv_core → ipv6_parse_hopopts → ipv6_hop_ioam), triggered by a remotely deliverable IPv6 packet with a Hop-by-Hop IOAM option.\nAC:L - An attacker can reliably win the TOCTOU race by flooding IOAM Hop-by-Hop packets while concurrently unregistering the netdev (e.g., via user namespace with CAP_NET_ADMIN and `ip link del`), controlling both sides of the race.\nPR:N - No kernel privileges are required to send crafted IPv6 packets; interface unregister also occurs during normal container/pod lifecycle on shared cloud hosts without attacker admin action.\nUI:N - Exploitation requires only sending network packets during interface teardown and does not depend on any victim user action.\nS:U - Impact is a kernel NULL dereference and crash on the receiving host; it does not cross a VM, container, or IOMMU security boundary.\nC:N - The fault is a NULL pointer read at a fixed offset (idev->cnf.ioam6_enabled), causing an immediate page fault with no controlled or bounded information disclosure.\nI:N - This is a read-side NULL dereference only; there is no memory corruption, arbitrary write, or code execution primitive.\nA:H - A successful trigger causes a kernel NULL pointer dereference, producing an oops or panic and denying service on the affected system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/exthdrs.c" ], "versions": [ { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "c7e8971abd70e9d022f1c251ba2508f8dc7f2db8", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "09cbfd4b81ae90963dadb1de99b63b702e73290a", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "1dca7e491f070ac49b3d934f16ee953a53b37f38", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "902daac307eb7e1955ce05b071950f3cba88c963", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "abdd03229414b5a52943b65a60f34b84cea5ac59", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "cf75eb6617042c8cff6112daeed7791809fc9dd2", "status": "affected", "versionType": "git" }, { "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/exthdrs.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8" }, { "url": "https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a" }, { "url": "https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38" }, { "url": "https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963" }, { "url": "https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59" }, { "url": "https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2" }, { "url": "https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9" } ], "title": "ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()", "x_generator": { "engine": "bippy-1.2.0" } } } }