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CVE-2022-50697 (GCVE-0-2022-50697)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2026-08-05 08:59
VLAI
Title
mrp: introduce active flags to prevent UAF when applicant uninit
Summary
In the Linux kernel, the following vulnerability has been resolved: mrp: introduce active flags to prevent UAF when applicant uninit The caller of del_timer_sync must prevent restarting of the timer, If we have no this synchronization, there is a small probability that the cancellation will not be successful. And syzbot report the fellowing crash: ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline] BUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605 Write at addr f9ff000024df6058 by task syz-fuzzer/2256 Pointer tag: [f9], memory tag: [fe] CPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008- ge01d50cbd6ee #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156 dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline] show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x1a8/0x4a0 mm/kasan/report.c:395 kasan_report+0x94/0xb4 mm/kasan/report.c:495 __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320 do_bad_area arch/arm64/mm/fault.c:473 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 hlist_add_head include/linux/list.h:929 [inline] enqueue_timer+0x18/0xa4 kernel/time/timer.c:605 mod_timer+0x14/0x20 kernel/time/timer.c:1161 mrp_periodic_timer_arm net/802/mrp.c:614 [inline] mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627 call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474 expire_timers+0x98/0xc4 kernel/time/timer.c:1519 To fix it, we can introduce a new active flags to make sure the timer will not restart.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 98f53e591940e4c3818be358c5dc684d5b30cb56 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 78d48bc41f7726113c9f114268d3ab11212814da (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < aadb1507a77b060c529edfeaf67f803e31461f24 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 755eb0879224ffc2a43de724554aeaf0e51e5a64 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 5d5a481a7fd0234f617535dc464ea010804a1129 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < 563e45fd5046045cc194af3ba17f5423e1c98170 (git)
Affected: febf018d22347b5df94066bca05d0c11a84e839d , < ab0377803dafc58f1e22296708c1c28e309414d6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "version": "5.4.229",
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              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmrp: introduce active flags to prevent UAF when applicant uninit\n\nThe caller of del_timer_sync must prevent restarting of the timer, If\nwe have no this synchronization, there is a small probability that the\ncancellation will not be successful.\n\nAnd syzbot report the fellowing crash:\n==================================================================\nBUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline]\nBUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\nWrite at addr f9ff000024df6058 by task syz-fuzzer/2256\nPointer tag: [f9], memory tag: [fe]\n\nCPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008-\nge01d50cbd6ee #0\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156\n dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]\n show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x1a8/0x4a0 mm/kasan/report.c:395\n kasan_report+0x94/0xb4 mm/kasan/report.c:495\n __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320\n do_bad_area arch/arm64/mm/fault.c:473 [inline]\n do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749\n do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825\n el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367\n el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427\n el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576\n hlist_add_head include/linux/list.h:929 [inline]\n enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\n mod_timer+0x14/0x20 kernel/time/timer.c:1161\n mrp_periodic_timer_arm net/802/mrp.c:614 [inline]\n mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627\n call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474\n expire_timers+0x98/0xc4 kernel/time/timer.c:1519\n\nTo fix it, we can introduce a new active flags to make sure the timer will\nnot restart."
        }
      ],
      "metrics": [
        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is triggered by locally creating and destroying a VLAN device (rtnetlink/ioctl \u2192 register_vlan_dev/unregister_vlan_dev \u2192 mrp_init_applicant/mrp_uninit_applicant), not by processing remote or adjacent MRP frames on the mrp_rcv path.\nAC:L - The attacker controls applicant teardown by repeatedly creating and deleting the last VLAN on a device while the join (~200ms) and periodic (1s) timers self-rearm, and can retry until del_timer_sync loses the restart race; this matches attacker-driven timer/teardown races scored AC:L.\nPR:L - VLAN create/delete requires CAP_NET_ADMIN checked with ns_capable/sk_ns_capable against the net\u0027s user_ns, which an unprivileged user obtains via user namespaces (e.g. unshare -Urn with veth+vlan), so privileges are Low not High.\nUI:N - The attacker alone creates and destroys VLAN interfaces to drive the race; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is a host-kernel heap use-after-free and potential privilege escalation within the same OS security authority, not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The freed mrp_applicant (including embedded timer_list and applicant state) is subject to heap reclaim; per UAF guidance this enables arbitrary kernel memory disclosure primitives.\nI:H - KASAN shows a write-after-free in enqueue_timer/mod_timer on the freed applicant, and later timer callbacks continue using the reclaimed object, yielding heap write and control-flow hijack primitives.\nA:H - The confirmed KASAN use-after-free already oopses/crashes the kernel when the rearmed periodic timer runs on freed memory, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:24.625Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56"
        },
        {
          "url": "https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9"
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        {
          "url": "https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24"
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        {
          "url": "https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64"
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        {
          "url": "https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129"
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        {
          "url": "https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6"
        }
      ],
      "title": "mrp: introduce active flags to prevent UAF when applicant uninit",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50697",
    "datePublished": "2025-12-24T10:55:13.762Z",
    "dateReserved": "2025-12-24T10:53:15.517Z",
    "dateUpdated": "2026-08-05T08:59:24.625Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50697",
      "date": "2026-09-16",
      "epss": "0.00154",
      "percentile": "0.04919"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50697\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:48.833\",\"lastModified\":\"2026-08-04T10:18:21.507\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmrp: introduce active flags to prevent UAF when applicant uninit\\n\\nThe caller of del_timer_sync must prevent restarting of the timer, If\\nwe have no this synchronization, there is a small probability that the\\ncancellation will not be successful.\\n\\nAnd syzbot report the fellowing crash:\\n==================================================================\\nBUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline]\\nBUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\\nWrite at addr f9ff000024df6058 by task syz-fuzzer/2256\\nPointer tag: [f9], memory tag: [fe]\\n\\nCPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008-\\nge01d50cbd6ee #0\\nHardware name: linux,dummy-virt (DT)\\nCall trace:\\n dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156\\n dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]\\n show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106\\n print_address_description mm/kasan/report.c:284 [inline]\\n print_report+0x1a8/0x4a0 mm/kasan/report.c:395\\n kasan_report+0x94/0xb4 mm/kasan/report.c:495\\n __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320\\n do_bad_area arch/arm64/mm/fault.c:473 [inline]\\n do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749\\n do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825\\n el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367\\n el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427\\n el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576\\n hlist_add_head include/linux/list.h:929 [inline]\\n enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\\n mod_timer+0x14/0x20 kernel/time/timer.c:1161\\n mrp_periodic_timer_arm net/802/mrp.c:614 [inline]\\n mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627\\n call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474\\n expire_timers+0x98/0xc4 kernel/time/timer.c:1519\\n\\nTo fix it, we can introduce a new active flags to make sure the timer will\\nnot restart.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/mrp.h\",\"net/802/mrp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"98f53e591940e4c3818be358c5dc684d5b30cb56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"78d48bc41f7726113c9f114268d3ab11212814da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"aadb1507a77b060c529edfeaf67f803e31461f24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"755eb0879224ffc2a43de724554aeaf0e51e5a64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"5d5a481a7fd0234f617535dc464ea010804a1129\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"563e45fd5046045cc194af3ba17f5423e1c98170\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"febf018d22347b5df94066bca05d0c11a84e839d\",\"lessThan\":\"ab0377803dafc58f1e22296708c1c28e309414d6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/mrp.h\",\"net/802/mrp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.337\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.303\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.270\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.229\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.163\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.86\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.16\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.2\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:59:08+00:00",
      "cve": "CVE-2022-50697",
      "id": "CVE-2022-50697",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-after-free in mrp module leads to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50697.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T01:21:35Z",
      "cve": "CVE-2022-50697",
      "id": "CVE-2022-50697",
      "initial_release_date": "2025-12-25T01:05:34Z",
      "product_status:known_affected": "541",
      "product_status:known_not_affected": "178",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50697",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50697.json",
      "version": "30"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.