243 lines
12 KiB
JSON
243 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64116",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.035Z",
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"datePublished": "2026-07-19T15:40:16.240Z",
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"dateUpdated": "2026-08-05T12:39:25.437Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:25.437Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/exthdrs.c"
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],
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"versions": [
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{
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"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "c7e8971abd70e9d022f1c251ba2508f8dc7f2db8",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "abdd03229414b5a52943b65a60f34b84cea5ac59",
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"status": "affected",
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"versionType": "git"
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{
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"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "cf75eb6617042c8cff6112daeed7791809fc9dd2",
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"status": "affected",
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{
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/exthdrs.c"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.92",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"cpeApplicability": [
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"references": [
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"url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8"
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}
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],
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"title": "ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()",
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