219 lines
12 KiB
JSON
219 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-2026-45845",
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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": "2026-05-13T15:03:33.078Z",
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"datePublished": "2026-05-27T09:24:48.438Z",
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"dateUpdated": "2026-11-06T15:42:59.407Z"
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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": "2026-06-14T17:46:27.191Z"
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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: taprio: fix NULL pointer dereference in class dump\n\nWhen a TAPRIO child qdisc is deleted via RTM_DELQDISC, taprio_graft()\nis called with new == NULL and stores NULL into q->qdiscs[cl - 1].\nSubsequent RTM_GETTCLASS dump operations walk all classes via\ntaprio_walk() and call taprio_dump_class(), which calls taprio_leaf()\nreturning the NULL pointer, then dereferences it to read child->handle,\ncausing a kernel NULL pointer dereference.\n\nThe bug is reachable with namespace-scoped CAP_NET_ADMIN on any kernel\nwith CONFIG_NET_SCH_TAPRIO enabled. On systems with unprivileged user\nnamespaces enabled, an unprivileged local user can trigger a kernel\npanic by creating a taprio qdisc inside a new network namespace,\ngrafting an explicit child qdisc, deleting it, and requesting a class\ndump. The RTM_GETTCLASS dump itself requires no capability.\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\n RIP: 0010:taprio_dump_class (net/sched/sch_taprio.c:2478)\n Call Trace:\n <TASK>\n tc_fill_tclass (net/sched/sch_api.c:1966)\n qdisc_class_dump (net/sched/sch_api.c:2326)\n taprio_walk (net/sched/sch_taprio.c:2514)\n tc_dump_tclass_qdisc (net/sched/sch_api.c:2352)\n tc_dump_tclass_root (net/sched/sch_api.c:2370)\n tc_dump_tclass (net/sched/sch_api.c:2431)\n rtnl_dumpit (net/core/rtnetlink.c:6864)\n netlink_dump (net/netlink/af_netlink.c:2325)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)\n netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n </TASK>\n\nFix this by substituting &noop_qdisc when new is NULL in\ntaprio_graft(), a common pattern used by other qdiscs (e.g.,\nmultiq_graft()) to ensure the q->qdiscs[] slots are never NULL.\nThis makes control-plane dump paths safe without requiring individual\nNULL checks.\n\nSince the data-plane paths (taprio_enqueue and taprio_dequeue_from_txq)\npreviously had explicit NULL guards that would drop/skip the packet\ncleanly, update those checks to test for &noop_qdisc instead. Without\nthis, packets would reach taprio_enqueue_one() which increments the root\nqdisc's qlen and backlog before calling the child's enqueue; noop_qdisc\ndrops the packet but those counters are never rolled back, permanently\ninflating the root qdisc's statistics.\n\nAfter this change *old can be a valid qdisc, NULL, or &noop_qdisc.\nOnly call qdisc_put(*old) in the first case to avoid decreasing\nnoop_qdisc's refcount, which was never increased."
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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/sch_taprio.c"
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],
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"versions": [
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{
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"version": "665338b2a7a0139337d1f85be65ed16e487f84c1",
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"lessThan": "ec2501e361b08b50bcb1e7b3253fc861abbda28d",
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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": "665338b2a7a0139337d1f85be65ed16e487f84c1",
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"lessThan": "d02e2fbf60de46678e2ea698a6a904fd21e1cc31",
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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": "665338b2a7a0139337d1f85be65ed16e487f84c1",
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"lessThan": "48b26d48e76221dc90b02bf5428bab53643461ca",
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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": "665338b2a7a0139337d1f85be65ed16e487f84c1",
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"lessThan": "8f1ff8866cb9f655e5faea6994eb902960be8e04",
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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": "665338b2a7a0139337d1f85be65ed16e487f84c1",
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"lessThan": "3d07ca5c0fae311226f737963984bd94bb159a87",
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"status": "affected",
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"versionType": "git"
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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/sch_taprio.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "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": "6.6.141",
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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": "6.12.91",
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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": "6.18.33",
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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": "7.0.10",
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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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]
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.141"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.12.91"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.18.33"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "7.0.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ec2501e361b08b50bcb1e7b3253fc861abbda28d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d02e2fbf60de46678e2ea698a6a904fd21e1cc31"
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},
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{
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"url": "https://git.kernel.org/stable/c/48b26d48e76221dc90b02bf5428bab53643461ca"
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},
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{
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"url": "https://git.kernel.org/stable/c/8f1ff8866cb9f655e5faea6994eb902960be8e04"
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},
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{
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"url": "https://git.kernel.org/stable/c/3d07ca5c0fae311226f737963984bd94bb159a87"
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}
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],
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"title": "net/sched: taprio: fix NULL pointer dereference in class dump",
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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-2026-45845",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-06T15:41:59.608192Z"
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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": "2026-11-06T15:42:59.407Z"
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}
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}
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]
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}
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} |