298 lines
16 KiB
JSON
298 lines
16 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-2026-74583",
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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": "2026-08-15T05:44:03.918Z",
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"datePublished": "2026-08-21T16:31:55.886Z",
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"dateUpdated": "2026-10-16T19:05:58.388Z"
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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": "2026-08-25T05:40:10.077Z"
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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_route: fix fastmap use-after-free on filter\n\nThe route4 classifier maintains a 16-slot fastmap cache that stores raw\nstruct route4_filter pointers indexed by (id, iif). The reader\n(route4_classify) populates this cache via route4_set_fastmap() for every\nclassified packet that hits a filter. The writer (route4_delete,\nroute4_change) clears the cache via route4_reset_fastmap() before\nRCU-deferred kfree of the filter.\n\nThis creates a UAF race:\n 1. Reader walks the RCU-protected bucket chain, finds filter f\n 2. Writer unlinks f, calls route4_reset_fastmap(), then tcf_queue_work()\n 3. Reader calls route4_set_fastmap() and writes f into the cache\n *after* the writer's reset, caching a pointer about to be freed\n 4. After the RCU grace period, kfree(f) executes\n 5. Next classified packet on the same (id, iif) tuple hits the stale\n fastmap entry and reads f->res from freed memory\n\nReproduced with an mdelay(100) accelerator in route4_set_fastmap() and a\nconcurrent add/delete stress test (provided by both zdi and Santosh).\nBoth triggered KASAN slab-use-after-free reports in the route4 fastmap\npaths.\n\nFix:\nIntroduce a per-filter boolean dying flag to suppress stale fastmap\nrepublishing by in-flight readers."
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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 - Exploitation requires local rtnetlink RTM_NEWTFILTER/RTM_DELTFILTER (tc filter add/change/del route) through sendmsg→rtnetlink_rcv_msg→tc_new_tfilter/tc_del_tfilter→route4_change/route4_delete; remote packets alone cannot trigger the filter-deletion side of the race.\nAC:L - The attacker controls both race sides—concurrent route filter add/change/delete via netlink plus traffic through route4_classify on clsact/ingress/egress qdiscs; ZDI and independent reporter stress tests reproduced KASAN slab-use-after-free without uncontrollable prerequisites.\nPR:L - Non-GET rtnetlink handlers require netlink_net_capable(CAP_NET_ADMIN), evaluated against the target network namespace user_ns; an unprivileged local user obtains CAP_NET_ADMIN via user+network namespaces (unshare -Urn) and configures clsact with route filters.\nUI:N - No victim interaction is needed; the attacker configures the route classifier, drives concurrent filter churn, and generates matching traffic from their own processes.\nS:U - Impact is kernel memory corruption within the same kernel security boundary (local privilege escalation/DoS); it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Slab use-after-free: a stale fastmap entry retains a freed route4_filter pointer and route4_classify dereferences f->res from freed kmalloc memory; KASAN confirmed slab-use-after-free, enabling arbitrary kernel read via heap reclaim/spray.\nI:H - UAF of the kmalloc route4_filter object allows attacker-controlled heap spraying to reclaim the freed slot and obtain write/control-flow hijacking primitives; memory corruption is exploitable beyond a simple crash.\nA:H - UAF on the fastmap hot path causes kernel oops/panic under concurrent filter churn; KASAN slab-use-after-free was confirmed during add/delete stress testing, providing reliable denial of service even without full exploitation."
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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_route.c"
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],
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{
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{
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"product": "Linux",
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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_route.c"
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],
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"status": "affected"
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"version": "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": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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"version": "6.1.183",
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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": "6.6.152",
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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": "6.18.45",
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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": "7.1.9",
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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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"url": "https://git.kernel.org/stable/c/ae9aff87025219005a2d16b4fe83d6f24643e50d"
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},
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{
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"url": "https://git.kernel.org/stable/c/47d7f7051253bdc02b1d245d87e38f16d31a74df"
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}
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],
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"title": "net/sched: cls_route: fix fastmap use-after-free on filter",
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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-2026-74583",
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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": "2026-10-16T19:01:17.964713Z"
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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": "2026-10-16T19:05:58.388Z"
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}
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}
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]
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}
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} |