FKIE_CVE-2022-48759

Vulnerability from fkie_nvd - Published: 2024-06-20 12:15 - Updated: 2026-08-04 10:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev struct rpmsg_ctrldev contains a struct cdev. The current code frees the rpmsg_ctrldev struct in rpmsg_ctrldev_release_device(), but the cdev is a managed object, therefore its release is not predictable and the rpmsg_ctrldev could be freed before the cdev is entirely released, as in the backtrace below. [ 93.625603] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x7c [ 93.636115] WARNING: CPU: 0 PID: 12 at lib/debugobjects.c:488 debug_print_object+0x13c/0x1b0 [ 93.644799] Modules linked in: veth xt_cgroup xt_MASQUERADE rfcomm algif_hash algif_skcipher af_alg uinput ip6table_nat fuse uvcvideo videobuf2_vmalloc venus_enc venus_dec videobuf2_dma_contig hci_uart btandroid btqca snd_soc_rt5682_i2c bluetooth qcom_spmi_temp_alarm snd_soc_rt5682v [ 93.715175] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G B 5.4.163-lockdep #26 [ 93.723855] Hardware name: Google Lazor (rev3 - 8) with LTE (DT) [ 93.730055] Workqueue: events kobject_delayed_cleanup [ 93.735271] pstate: 60c00009 (nZCv daif +PAN +UAO) [ 93.740216] pc : debug_print_object+0x13c/0x1b0 [ 93.744890] lr : debug_print_object+0x13c/0x1b0 [ 93.749555] sp : ffffffacf5bc7940 [ 93.752978] x29: ffffffacf5bc7940 x28: dfffffd000000000 [ 93.758448] x27: ffffffacdb11a800 x26: dfffffd000000000 [ 93.763916] x25: ffffffd0734f856c x24: dfffffd000000000 [ 93.769389] x23: 0000000000000000 x22: ffffffd0733c35b0 [ 93.774860] x21: ffffffd0751994a0 x20: ffffffd075ec27c0 [ 93.780338] x19: ffffffd075199100 x18: 00000000000276e0 [ 93.785814] x17: 0000000000000000 x16: dfffffd000000000 [ 93.791291] x15: ffffffffffffffff x14: 6e6968207473696c [ 93.796768] x13: 0000000000000000 x12: ffffffd075e2b000 [ 93.802244] x11: 0000000000000001 x10: 0000000000000000 [ 93.807723] x9 : d13400dff1921900 x8 : d13400dff1921900 [ 93.813200] x7 : 0000000000000000 x6 : 0000000000000000 [ 93.818676] x5 : 0000000000000080 x4 : 0000000000000000 [ 93.824152] x3 : ffffffd0732a0fa4 x2 : 0000000000000001 [ 93.829628] x1 : ffffffacf5bc7580 x0 : 0000000000000061 [ 93.835104] Call trace: [ 93.837644] debug_print_object+0x13c/0x1b0 [ 93.841963] __debug_check_no_obj_freed+0x25c/0x3c0 [ 93.846987] debug_check_no_obj_freed+0x18/0x20 [ 93.851669] slab_free_freelist_hook+0xbc/0x1e4 [ 93.856346] kfree+0xfc/0x2f4 [ 93.859416] rpmsg_ctrldev_release_device+0x78/0xb8 [ 93.864445] device_release+0x84/0x168 [ 93.868310] kobject_cleanup+0x12c/0x298 [ 93.872356] kobject_delayed_cleanup+0x10/0x18 [ 93.876948] process_one_work+0x578/0x92c [ 93.881086] worker_thread+0x804/0xcf8 [ 93.884963] kthread+0x2a8/0x314 [ 93.888303] ret_from_fork+0x10/0x18 The cdev_device_add/del() API was created to address this issue (see commit '233ed09d7fda ("chardev: add helper function to register char devs with a struct device")'), use it instead of cdev add/del().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dbb206730f3e5ce90014ad569ddf8167ec4124aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70cb4295ec806b663665e1d2ed15caab6159880ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74d85e9fbc7022a4011102c7474a9c7aeb704a35Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85aba11a8ea92a8eef2de95ebbe063086fd62d9cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7fb2dad571d1e21173c06cef0bced77b323990aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6cdc6ae542845d4d0ac8b6d99362bde7042a3c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da27b834c1e0222e149e06caddf7718478086d1bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1dbb206730f3e5ce90014ad569ddf8167ec4124aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/70cb4295ec806b663665e1d2ed15caab6159880ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/74d85e9fbc7022a4011102c7474a9c7aeb704a35Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/85aba11a8ea92a8eef2de95ebbe063086fd62d9cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b7fb2dad571d1e21173c06cef0bced77b323990aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d6cdc6ae542845d4d0ac8b6d99362bde7042a3c7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/da27b834c1e0222e149e06caddf7718478086d1bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.17
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/rpmsg/rpmsg_char.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "da27b834c1e0222e149e06caddf7718478086d1b",
              "status": "affected",
              "version": "c0cdc19f84a4712cf74888f83af286e3c2e14efd",
              "versionType": "git"
            },
            {
              "lessThan": "1dbb206730f3e5ce90014ad569ddf8167ec4124a",
              "status": "affected",
              "version": "c0cdc19f84a4712cf74888f83af286e3c2e14efd",
              "versionType": "git"
            },
            {
              "lessThan": "85aba11a8ea92a8eef2de95ebbe063086fd62d9c",
              "status": "affected",
              "version": "c0cdc19f84a4712cf74888f83af286e3c2e14efd",
              "versionType": "git"
            },
            {
              "lessThan": "d6cdc6ae542845d4d0ac8b6d99362bde7042a3c7",
              "status": "affected",
              "version": "c0cdc19f84a4712cf74888f83af286e3c2e14efd",
              "versionType": "git"
            },
            {
              "lessThan": "b7fb2dad571d1e21173c06cef0bced77b323990a",
              "status": "affected",
              "version": "c0cdc19f84a4712cf74888f83af286e3c2e14efd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/rpmsg/rpmsg_char.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.228",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E303FBB2-9F13-4FBE-874A-B48C6A56A829",
              "versionEndExcluding": "4.14.265",
              "versionStartIncluding": "4.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "87288F16-8DE4-4680-95D9-8601B47620D7",
              "versionEndExcluding": "4.19.228",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "581D4C61-D3FC-4DB2-85E3-EE596EEBA89E",
              "versionEndExcluding": "5.4.176",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "27A6621A-A196-4220-957F-334B9124E477",
              "versionEndExcluding": "5.10.96",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DF69DD7C-FD57-4914-ABB0-FAEF87B0289D",
              "versionEndExcluding": "5.15.19",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1AD9E77E-B27E-450C-8FD8-B64EC5FB002D",
              "versionEndExcluding": "5.16.5",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev\n\nstruct rpmsg_ctrldev contains a struct cdev. The current code frees\nthe rpmsg_ctrldev struct in rpmsg_ctrldev_release_device(), but the\ncdev is a managed object, therefore its release is not predictable\nand the rpmsg_ctrldev could be freed before the cdev is entirely\nreleased, as in the backtrace below.\n\n[   93.625603] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x7c\n[   93.636115] WARNING: CPU: 0 PID: 12 at lib/debugobjects.c:488 debug_print_object+0x13c/0x1b0\n[   93.644799] Modules linked in: veth xt_cgroup xt_MASQUERADE rfcomm algif_hash algif_skcipher af_alg uinput ip6table_nat fuse uvcvideo videobuf2_vmalloc venus_enc venus_dec videobuf2_dma_contig hci_uart btandroid btqca snd_soc_rt5682_i2c bluetooth qcom_spmi_temp_alarm snd_soc_rt5682v\n[   93.715175] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G    B             5.4.163-lockdep #26\n[   93.723855] Hardware name: Google Lazor (rev3 - 8) with LTE (DT)\n[   93.730055] Workqueue: events kobject_delayed_cleanup\n[   93.735271] pstate: 60c00009 (nZCv daif +PAN +UAO)\n[   93.740216] pc : debug_print_object+0x13c/0x1b0\n[   93.744890] lr : debug_print_object+0x13c/0x1b0\n[   93.749555] sp : ffffffacf5bc7940\n[   93.752978] x29: ffffffacf5bc7940 x28: dfffffd000000000\n[   93.758448] x27: ffffffacdb11a800 x26: dfffffd000000000\n[   93.763916] x25: ffffffd0734f856c x24: dfffffd000000000\n[   93.769389] x23: 0000000000000000 x22: ffffffd0733c35b0\n[   93.774860] x21: ffffffd0751994a0 x20: ffffffd075ec27c0\n[   93.780338] x19: ffffffd075199100 x18: 00000000000276e0\n[   93.785814] x17: 0000000000000000 x16: dfffffd000000000\n[   93.791291] x15: ffffffffffffffff x14: 6e6968207473696c\n[   93.796768] x13: 0000000000000000 x12: ffffffd075e2b000\n[   93.802244] x11: 0000000000000001 x10: 0000000000000000\n[   93.807723] x9 : d13400dff1921900 x8 : d13400dff1921900\n[   93.813200] x7 : 0000000000000000 x6 : 0000000000000000\n[   93.818676] x5 : 0000000000000080 x4 : 0000000000000000\n[   93.824152] x3 : ffffffd0732a0fa4 x2 : 0000000000000001\n[   93.829628] x1 : ffffffacf5bc7580 x0 : 0000000000000061\n[   93.835104] Call trace:\n[   93.837644]  debug_print_object+0x13c/0x1b0\n[   93.841963]  __debug_check_no_obj_freed+0x25c/0x3c0\n[   93.846987]  debug_check_no_obj_freed+0x18/0x20\n[   93.851669]  slab_free_freelist_hook+0xbc/0x1e4\n[   93.856346]  kfree+0xfc/0x2f4\n[   93.859416]  rpmsg_ctrldev_release_device+0x78/0xb8\n[   93.864445]  device_release+0x84/0x168\n[   93.868310]  kobject_cleanup+0x12c/0x298\n[   93.872356]  kobject_delayed_cleanup+0x10/0x18\n[   93.876948]  process_one_work+0x578/0x92c\n[   93.881086]  worker_thread+0x804/0xcf8\n[   93.884963]  kthread+0x2a8/0x314\n[   93.888303]  ret_from_fork+0x10/0x18\n\nThe cdev_device_add/del() API was created to address this issue (see\ncommit \u0027233ed09d7fda (\"chardev: add helper function to register char\ndevs with a struct device\")\u0027), use it instead of cdev add/del()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rpmsg: char: corrige la ejecuci\u00f3n entre el lanzamiento de rpmsg_ctrldev y cdev struct rpmsg_ctrldev contiene una estructura cdev. El c\u00f3digo actual libera la estructura rpmsg_ctrldev en rpmsg_ctrldev_release_device(), pero el cdev es un objeto administrado, por lo tanto su liberaci\u00f3n no es predecible y rpmsg_ctrldev podr\u00eda liberarse antes de que el cdev se libere por completo, como se muestra en el seguimiento a continuaci\u00f3n. [ 93.625603] ODEBUG: tipo de objeto activo libre (estado activo 0): timer_list sugerencia: retardado_work_timer_fn+0x0/0x7c [ 93.636115] ADVERTENCIA: CPU: 0 PID: 12 en lib/debugobjects.c:488 debug_print_object+0x13c/0x1b0 [ 93.644799 ] M\u00f3dulos vinculados en: veth xt_cgroup xt_MASQUERADE rfcomm algif_hash algif_skcipher af_alg uinput ip6table_nat fuse uvcvideo videobuf2_vmalloc venus_enc venus_dec videobuf2_dma_contig hci_uart btandroid btqca snd_soc_rt5682_i2c bluetooth qcom_spmi_temp_al arm snd_soc_rt5682v [93.715175] CPU: 0 PID: 12 Comm: kworker/0:1 Contaminado: GB 5.4.163-lockdep #26 [93.723855] Nombre del hardware: Google Lazor (rev3 - 8) con LTE (DT) [93.730055] Cola de trabajo: eventos kobject_delayed_cleanup [93.735271] pstate: 60c00009 (nZCv daif +PAN +UAO) [93.740216] pc: debug_print_object+0x 13c/ 0x1b0 [93.744890] lr: debug_print_object+0x13c/0x1b0 [93.749555] sp: ffffffacf5bc7940 [93.752978] x29: ffffffacf5bc7940 x28: dfffffd000000000 [93.758448] 27: fffffacdb11a800 x26: dfffffd000000000 [ 93.763916] x25: ffffffd0734f856c x24: dfffffd000000000 [ 93.769389] x23: 0000000000000000 x22: ffffffd0733c35b0 [ 93.774860] x21: ffffffd0751994a0 x20: ffffffd075ec27c0 [ 93.780338] x19: ffffffd075199100 x18: 00000000000276e0 [ 93.78 5814] x17: 0000000000000000 x16: dfffffd000000000 [ 93.791291] x15: ffffffffffffffff x14: 6e6968207473696c [ 93.796768] x13: 00000000000000000 x 12: ffffffd075e2b000 [ 93.802244 ] x11: 0000000000000001 x10: 0000000000000000 [ 93.807723] x9 : d13400dff1921900 x8 : d13400dff1921900 [ 93.813200] x7 : 000000000000000 0 x6: 0000000000000000 [93.818676] x5: 0000000000000080 x4: 0000000000000000 [93.824152] x3: ffffffd0732a0fa4 x2: 0000000000000001 [9 3.829628] x1 : ffffffacf5bc7580 x0 : 0000000000000061 [93.835104] Rastreo de llamadas: [93.837644] debug_print_object+0x13c/0x1b0 [93.841963] __debug_check_no_obj_freed+0x25c/0x3c0 [93.846987] _freed+0x18/0x20 [ 93.851669] slab_free_freelist_hook+0xbc/0x1e4 [ 93.856346] kfree+0xfc/0x2f4 [ 93.859416 ] rpmsg_ctrldev_release_device+0x78/0xb8 [ 93.864445] device_release+0x84/0x168 [ 93.868310] kobject_cleanup+0x12c/0x298 [ 93.872356] kobject_delayed_cleanup+0x10/0x18 [ 93.87694 8] proceso_one_work+0x578/0x92c [ 93.881086] hilo_trabajador+0x804/0xcf8 [ 93.884963] kthread +0x2a8/0x314 [ 93.888303] ret_from_fork+0x10/0x18 La API cdev_device_add/del() se cre\u00f3 para solucionar este problema (consulte el commit \u0027233ed09d7fda (\"chardev: agregar funci\u00f3n auxiliar para registrar desarrolladores de caracteres con un dispositivo de estructura\")\u0027), \u00daselo en lugar de cdev add/del()."
    }
  ],
  "id": "CVE-2022-48759",
  "lastModified": "2026-08-04T10:17:19.767",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-48759",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-20T15:44:05.243673Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-06-20T12:15:14.023",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1dbb206730f3e5ce90014ad569ddf8167ec4124a"
    },
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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.



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.