323 lines
17 KiB
JSON
323 lines
17 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-2026-64530",
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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": "2026-07-19T15:36:31.794Z",
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"datePublished": "2026-07-26T06:28:42.970Z",
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"dateUpdated": "2026-10-19T20:48:38.296Z"
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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": "2026-08-17T04:57:07.900Z"
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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\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n tc filter add block 10 ... action ct\n\n (with ct defrag enabled and traffic that produces out-of-order\n fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us."
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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 - On a transparent bridge or traffic-shaping gateway configured with the RED qevent and act_ct, unauthenticated remote IP fragments reach red_enqueue() through normal receive, bridge-forwarding, and egress-qdisc processing. No local netlink access is required to trigger the deployed configuration.\nAC:L - The attacker controls fragment contents and ordering and can drive RED into deterministic hard-mark or drop conditions with sustained traffic. No race or condition outside the attacker's control must be won.\nPR:N - CAP_NET_ADMIN is required to create the vulnerable configuration, but a remote attacker sending fragments through an already configured appliance needs no privileges or authentication. Local triggering is also possible with namespaced CAP_NET_ADMIN.\nUI:N - Triggering requires only attacker-generated fragmented traffic and does not depend on a victim performing any action.\nS:U - The corruption occurs within the host kernel and compromises resources governed by that same security authority. This remains unchanged scope even when used for namespace escape or kernel privilege escalation.\nC:H - The reclaimable sk_buff use-after-free and corrupted defragmentation-tree links can be leveraged through attacker-controlled network heap spraying to disclose arbitrary kernel memory.\nI:H - RED overwrites linkage fields that overlap the defragmentation RB node and may free the object while it remains referenced, enabling subsequent writes through freed or attacker-reclaimed kernel objects and potential code execution.\nA:H - The dangling fragment-tree entry can cause immediate or deferred use-after-free, double-free, invalid tree operations, and kernel panic when another fragment arrives or the queue expires. The attacker can trigger this repeatedly with fragmented traffic."
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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/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "172ba7d46c202e679f3ccb10264c67416aaeb1c4",
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"lessThan": "5ed3d6f85991656667059d3fa5a1d683ac58c447",
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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": "0b5b831122fc3789fff75be433ba3e4dd7b779d4",
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"lessThan": "f42e8134a3a1074b834a574d404352f867ba994a",
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"status": "affected",
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},
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{
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"lessThan": "447d493034a9cf7bf13a2abac86d0573d907ec2f",
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"status": "affected",
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},
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{
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"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6",
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"lessThan": "e1270e69dcf2c3512c453484178f2e9dc0db3f05",
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"status": "affected",
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},
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"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6",
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"lessThan": "2140c2f3f2e7b066e1ae616ede8856cafd8015e9",
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},
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{
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"version": "3f14b377d01d8357eba032b4cabc8c1149b458b6",
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"lessThan": "e28aedab9488343924d227b5a896faed67ce84d5",
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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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"version": "f5346df0591d10bc948761ca854b1fae6d2ef441",
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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": "5.15.148",
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"lessThan": "5.15.212",
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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": "6.1.75",
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"lessThan": "6.1.178",
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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": "6.6.14",
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"lessThan": "6.6.145",
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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": "6.7.2",
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"lessThan": "6.8",
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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/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "6.8",
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"status": "affected"
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},
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{
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447"
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},
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{
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"url": "https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a"
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},
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{
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"url": "https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05"
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},
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{
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"url": "https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159"
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}
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],
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"title": "net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle",
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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-2026-64530",
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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": "yes"
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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": "2026-10-16T15:41:44.353854Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T20:48:38.296Z"
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}
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}
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]
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}
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} |