542 lines
25 KiB
JSON
542 lines
25 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-2026-23391",
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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": "2026-01-13T15:37:46.009Z",
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"datePublished": "2026-03-25T10:33:15.677Z",
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"dateUpdated": "2026-11-10T12:42:55.737Z"
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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": "2026-08-05T12:21:22.123Z"
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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\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helper, this can be an issue on module removal.\n- timeout policy, nfnetlink_cttimeout might remove it.\n\nThe use of templates with zone and event cache filter are safe, since\nthis just copies values.\n\nFlush these enqueued packets in case the template rule gets removed."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - Requires local access to configure iptables rules (CT target with helper/timeout) and NFQUEUE via netlink/setsockopt syscalls. Not remotely exploitable.\nAC:L - The attacker controls both sides of the race — they set up the NFQUEUE and CT rules, send packets to fill the queue, then remove the CT rule to trigger the UAF. No conditions beyond attacker control.\nPR:L - Requires CAP_NET_ADMIN, but ip_tables.c uses ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN), making it reachable from unprivileged user namespaces (unshare -Urn).\nUI:N - No user interaction required. The attacker can set up rules, send packets, and remove rules entirely on their own.\nS:U - Standard kernel privilege escalation within the same security authority. No VM escape, IOMMU bypass, or sandbox escape involved.\nC:H - Use-after-free on the helper/timeout objects allows reading freed and potentially reallocated memory, enabling arbitrary kernel memory disclosure through heap spraying.\nI:H - Use-after-free enables heap spraying — attacker can reclaim the freed helper/timeout object with controlled data, achieving arbitrary write primitives and code execution.\nA:H - Use-after-free reliably causes kernel crashes when the freed helper or timeout object is dereferenced through the dangling template pointer."
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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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"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/netfilter/xt_CT.c"
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],
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"versions": [
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{
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"status": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"net/netfilter/xt_CT.c"
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"status": "unaffected",
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{
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"version": "5.10.253",
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"lessThanOrEqual": "5.10.*",
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},
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{
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"version": "5.15.203",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.1.167",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.130",
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"lessThanOrEqual": "6.6.*",
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},
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{
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.20",
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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": "6.19.10",
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"lessThanOrEqual": "6.19.*",
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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",
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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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}
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"cpeMatch": [
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"url": "https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9"
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"url": "https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b"
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}
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],
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"title": "netfilter: xt_CT: drop pending enqueued packets on template removal",
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"x_generator": {
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"engine": "bippy-1.2.0"
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|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-23391",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:07:33.341687Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-416",
|
|
"description": "CWE-416 Use After Free"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:42.172Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |