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

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2026-05-11 19:23
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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)
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{
  "containers": {
    "cna": {
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        {
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          "product": "Linux",
          "programFiles": [
            "include/net/mrp.h",
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          ],
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          "vendor": "Linux",
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              "version": "3.9"
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              "version": "0",
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              "version": "4.9.337",
              "versionType": "semver"
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              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.303",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "4.19.270",
              "versionType": "semver"
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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                  "versionEndExcluding": "4.9.337",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
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                  "versionEndExcluding": "4.14.303",
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              "operator": "OR"
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:23:42.173Z",
        "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/78d48bc41f7726113c9f114268d3ab11212814da"
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          "url": "https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24"
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          "url": "https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129"
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        },
        {
          "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-05-11T19:23:42.173Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50697",
      "date": "2026-05-29",
      "epss": "0.00045",
      "percentile": "0.14362"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50697\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:48.833\",\"lastModified\":\"2025-12-29T15:58:56.260\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"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\"}]}}"
  }
}


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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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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