330 lines
18 KiB
JSON
330 lines
18 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-2026-89487",
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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": "2026-09-11T19:38:34.713Z",
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"datePublished": "2026-09-11T19:43:40.776Z",
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"dateUpdated": "2026-10-19T08:47:37.837Z"
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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": "2026-10-19T08:47:37.837Z"
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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\nopenvswitch: only skb_tx_error() a packet we are about to drop\n\nqueue_userspace_packet() borrows the packet skb -- it only copies it into\na private netlink message (user_skb) and does not own it; on return\ndo_execute_actions() keeps forwarding it through the flow's remaining\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\nskb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY,\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc\nsays \"skb must be freed afterwards\").\n\nFor a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is\nwhat makes esp_input() skb_cow_data() before in-place AEAD; once it is\nstripped a later local ESP-in-UDP delivery decrypts in place over pages\nthe sender does not own -- an unprivileged page-cache write (the\n\"Fragnesia\" primitive).\ndo_execute_actions() ignores output_userspace()'s return value, so any\naction after a failed USERSPACE upcall inherits the stripped skb.\n\nMove the skb_tx_error() to the flow-miss drop path - the \"default\"\nbranch of ovs_dp_process_packet()'s switch(error), before kfree_skb().\n\nThe call has been here since commit 36d5fe6a0007 (\"core, nfqueue,\nopenvswitch: Orphan frags in skb_zerocopy and handle errors\") but was\nharmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate\nin-place decrypt; only then did stripping it on a still-forwarded skb\nbecome a page-cache write primitive."
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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 - The strip runs only on a locally originated MSG_ZEROCOPY skb that still has a zerocopy uarg (skb_zcopy_clear is a no-op otherwise); NIC-received packets never carry that uarg, and the later in-place ESP decrypt is via a local SA, so a local account is required.\nAC:L - The attacker fully controls the OVS flow (non-last USERSPACE with a PID that makes genlmsg_unicast fail), the MSG_ZEROCOPY send, and the ESP SA/payload; do_execute_actions() ignores the upcall error, so the shared-frag strip and in-place decrypt are deterministic with no race beyond attacker influence.\nPR:L - OVS genetlink families are netnsok and use GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the socket user_ns); an unprivileged user can unshare -Urn, create a datapath/flow, enable SO_ZEROCOPY, and install xfrm SAs, while the global page cache remains the corruption target.\nUI:N - The attacker installs the OVS userspace-then-output flow, sends the MSG_ZEROCOPY packet, and completes local ESP-in-UDP delivery without any victim action such as opening a file or mounting a filesystem.\nS:U - The resulting page-cache write is a standard in-kernel memory-corruption/privilege-escalation primitive on the same host; it does not cross a VM hypervisor or IOMMU security boundary.\nC:H - Clearing SKBFL_SHARED_FRAG lets later esp_input() skip skb_cow_data() and AEAD-decrypt in place over page-cache-backed frags, a write primitive into globally cached file/code pages that can be leveraged for arbitrary disclosure.\nI:H - With the shared-frag marker stripped, ESP decrypts attacker-controlled plaintext in place over page-cache pages the sender does not own, yielding the Fragnesia unprivileged write into files the attacker could only read.\nA:H - In-place writes into page-cache-backed or still-mapped zerocopy pages corrupt shared kernel/file state and readily cause oopses, panics, and process crashes; skb_tx_error also completes the uarg while the skb is still in flight."
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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/openvswitch/datapath.c"
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],
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"versions": [
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "48db11e115d1b232edc5591604adc6eda95cd545",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "4477222e2916a18e273edc139c955ade6bbb7a69",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "4d5c460ef8754be1d43b16dbf02695b008b207d6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "6767d70cf46f65807a6a4c4406a518e6c12e36ae",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "e41a59fc056f63a7a1f42788913c53cc48d744aa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "5d85eef222cfd28e73deed7402c100229e8b9e6e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
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"lessThan": "0dbc2398fca3bb33eda963849f865ddb1b3aa05e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c5f0c0e7525443add533495e93ba8de6feab2396",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1674b4bf3eea3cac51b70778e89f8025f7cfe695",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3.10.51",
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"lessThan": "3.11",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "3.12.40",
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"lessThan": "3.13",
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"status": "affected",
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"versionType": "semver"
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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/openvswitch/datapath.c"
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],
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"versions": [
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{
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"version": "3.14",
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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": "3.14",
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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": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.109",
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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": "6.18.50",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.14",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a"
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},
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{
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"url": "https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545"
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},
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{
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"url": "https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69"
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},
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{
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"url": "https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae"
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},
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{
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"url": "https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"
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}
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],
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"title": "openvswitch: only skb_tx_error() a packet we are about to drop",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-89487",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:22:44.373891Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:40.151Z"
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}
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}
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]
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}
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} |