264 lines
14 KiB
JSON
264 lines
14 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-2022-49561",
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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": "2025-02-26T02:08:31.591Z",
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"datePublished": "2025-02-26T02:14:06.030Z",
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"dateUpdated": "2026-08-05T08:55:45.099Z"
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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": "2026-08-05T08:55:45.099Z"
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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: conntrack: re-fetch conntrack after insertion\n\nIn case the conntrack is clashing, insertion can free skb->_nfct and\nset skb->_nfct to the already-confirmed entry.\n\nThis wasn't found before because the conntrack entry and the extension\nspace used to free'd after an rcu grace period, plus the race needs\nevents enabled to trigger."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 UAF sits in nf_conntrack_confirm(), invoked from nf_confirm on NF_INET_LOCAL_IN and NF_INET_POST_ROUTING for packets traversing conntrack. On firewalls, NAT gateways, Docker/K8s hosts, and internet-facing servers with stateful filtering, a remote peer’s packets reach this path with no local login.\nAC:L - The insertion clash is triggered by concurrent UDP (allow_clash) flows that the attacker can send themselves, so they control both sides of the race. Conntrack event/ecache support is common in real deployments; it is not a rare uncontrollable condition.\nPR:N - Exploitation uses unauthenticated network packets against an already-active conntrack data path. No credentials or CAP_NET_ADMIN are required on the attacker side once the victim system is tracking connections.\nUI:N - The attacker only needs to send crafted concurrent packets; no victim user action such as mounting a device or opening a file is required.\nS:U - Impact is memory corruption within the host kernel’s conntrack authority. This is standard local kernel compromise, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Clash resolution can nf_ct_put()/free the loser ct and immediately kfree its extension, then nf_ct_ecache_exist/nf_ct_deliver_cached_events reuse that pointer—a use-after-free that can yield arbitrary read primitives.\nI:H - The same UAF on the nf_conn/extension heap is exploitable for heap reuse and arbitrary write/control-flow hijacking under standard kernel UAF exploitation.\nA:H - Dereferencing the freed conntrack/ecache state can oops/panic the kernel, and UAFs are treated as high availability impact even when not fully turned into code execution."
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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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"include/net/netfilter/nf_conntrack_core.h"
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],
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{
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"include/net/netfilter/nf_conntrack_core.h"
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],
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{
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"version": "4.7",
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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": "4.7",
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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": "4.14.282",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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},
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"version": "4.19.246",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"version": "5.4.197",
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"lessThanOrEqual": "5.4.*",
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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": "5.17.13",
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"lessThanOrEqual": "5.17.*",
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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": "5.18.2",
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"lessThanOrEqual": "5.18.*",
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"status": "unaffected",
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"versionType": "semver"
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"version": "5.19",
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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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],
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"title": "netfilter: conntrack: re-fetch conntrack after insertion",
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