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CVE-2022-49945

Estado: AnalizadaAlta (7.1)—

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (gpio-fan) Fix array out of bounds access

The driver does not check if the cooling state passed to gpio_fan_set_cur_state() exceeds the maximum cooling state as stored in fan_data->num_speeds. Since the cooling state is later used as an array index in set_fan_speed(), an array out of bounds access can occur. This can be exploited by setting the state of the thermal cooling device to arbitrary values, causing for example a kernel oops when unavailable memory is accessed this way.

Detalles técnicos trazas, registros y código del informe original
Example kernel oops:
[  807.987276] Unable to handle kernel paging request at virtual address ffffff80d0588064
[  807.987369] Mem abort info:
[  807.987398]   ESR = 0x96000005
[  807.987428]   EC = 0x25: DABT (current EL), IL = 32 bits
[  807.987477]   SET = 0, FnV = 0
[  807.987507]   EA = 0, S1PTW = 0
[  807.987536]   FSC = 0x05: level 1 translation fault
[  807.987570] Data abort info:
[  807.987763]   ISV = 0, ISS = 0x00000005
[  807.987801]   CM = 0, WnR = 0
[  807.987832] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000001165000
[  807.987872] [ffffff80d0588064] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
[  807.987961] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[  807.987992] Modules linked in: cmac algif_hash aes_arm64 algif_skcipher af_alg bnep hci_uart btbcm bluetooth ecdh_generic ecc 8021q garp stp llc snd_soc_hdmi_codec brcmfmac vc4 brcmutil cec drm_kms_helper snd_soc_core cfg80211 snd_compress bcm2835_codec(C) snd_pcm_dmaengine syscopyarea bcm2835_isp(C) bcm2835_v4l2(C) sysfillrect v4l2_mem2mem bcm2835_mmal_vchiq(C) raspberrypi_hwmon sysimgblt videobuf2_dma_contig videobuf2_vmalloc fb_sys_fops videobuf2_memops rfkill videobuf2_v4l2 videobuf2_common i2c_bcm2835 snd_bcm2835(C) videodev snd_pcm snd_timer snd mc vc_sm_cma(C) gpio_fan uio_pdrv_genirq uio drm fuse drm_panel_orientation_quirks backlight ip_tables x_tables ipv6
[  807.988508] CPU: 0 PID: 1321 Comm: bash Tainted: G         C        5.15.56-v8+ #1575
[  807.988548] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)
[  807.988574] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  807.988608] pc : set_fan_speed.part.5+0x34/0x80 [gpio_fan]
[  807.988654] lr : gpio_fan_set_cur_state+0x34/0x50 [gpio_fan]
[  807.988691] sp : ffffffc008cf3bd0
[  807.988710] x29: ffffffc008cf3bd0 x28: ffffff80019edac0 x27: 0000000000000000
[  807.988762] x26: 0000000000000000 x25: 0000000000000000 x24: ffffff800747c920
[  807.988787] x23: 000000000000000a x22: ffffff800369f000 x21: 000000001999997c
[  807.988854] x20: ffffff800369f2e8 x19: ffffff8002ae8080 x18: 0000000000000000
[  807.988877] x17: 0000000000000000 x16: 0000000000000000 x15: 000000559e271b70
[  807.988938] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
[  807.988960] x11: 0000000000000000 x10: ffffffc008cf3c20 x9 : ffffffcfb60c741c
[  807.989018] x8 : 000000000000000a x7 : 00000000ffffffc9 x6 : 0000000000000009
[  807.989040] x5 : 000000000000002a x4 : 0000000000000000 x3 : ffffff800369f2e8
[  807.989062] x2 : 000000000000e780 x1 : 0000000000000001 x0 : ffffff80d0588060
[  807.989084] Call trace:
[  807.989091]  set_fan_speed.part.5+0x34/0x80 [gpio_fan]
[  807.989113]  gpio_fan_set_cur_state+0x34/0x50 [gpio_fan]
[  807.989199]  cur_state_store+0x84/0xd0
[  807.989221]  dev_attr_store+0x20/0x38
[  807.989262]  sysfs_kf_write+0x4c/0x60
[  807.989282]  kernfs_fop_write_iter+0x130/0x1c0
[  807.989298]  new_sync_write+0x10c/0x190
[  807.989315]  vfs_write+0x254/0x378
[  807.989362]  ksys_write+0x70/0xf8
[  807.989379]  __arm64_sys_write+0x24/0x30
[  807.989424]  invoke_syscall+0x4c/0x110
[  807.989442]  el0_svc_common.constprop.3+0xfc/0x120
[  807.989458]  do_el0_svc+0x2c/0x90
[  807.989473]  el0_svc+0x24/0x60
[  807.989544]  el0t_64_sync_handler+0x90/0xb8
[  807.989558]  el0t_64_sync+0x1a0/0x1a4
[  807.989579] Code: b9403801 f9402800 7100003f 8b35cc00 (b9400416)
[  807.989627] ---[ end t
---truncated---

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local sin interacción (AV:L, PR:L, UI:N) permite escalada mediante desbordamiento de array en controlador gpio-fan. El atacante escribe valores arbitrarios en sysfs provocando oops del kernel (DoS de recursos). Ejecución de código potencial si se corrompen estructuras de datos del kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-49945",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "e9f6972ab40a82bd7f6d36800792ba2e084474d8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "3ff866455e1e263a9ac1958095fd440984248e2f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "c8ae6a18708f260ccdeef6ba53af7548457dc26c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "7756eb1ed124753f4d64f761fc3d84290dffcb4d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "517dba798793e69b510779c3cde7224a65f3ed1d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "53196e0376205ed49b75bfd0475af5e0fbd20156",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "3263984c7acdcb0658155b05a724ed45a10de76d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5cf88e46badea6d600d8515edea23814e03444d",
              "lessThan": "f233d2be38dbbb22299192292983037f01ab363c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/hwmon/gpio-fan.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.9.328",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "status": "unaffected",
              "version": "4.14.293",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "status": "unaffected",
              "version": "4.19.258",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "status": "unaffected",
              "version": "5.4.213",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.142",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.66",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.19.8",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/hwmon/gpio-fan.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:21.483",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3263984c7acdcb0658155b05a724ed45a10de76d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3ff866455e1e263a9ac1958095fd440984248e2f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/517dba798793e69b510779c3cde7224a65f3ed1d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/53196e0376205ed49b75bfd0475af5e0fbd20156",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7756eb1ed124753f4d64f761fc3d84290dffcb4d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c8ae6a18708f260ccdeef6ba53af7548457dc26c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e9f6972ab40a82bd7f6d36800792ba2e084474d8",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f233d2be38dbbb22299192292983037f01ab363c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (gpio-fan) Fix array out of bounds access\n\nThe driver does not check if the cooling state passed to\ngpio_fan_set_cur_state() exceeds the maximum cooling state as\nstored in fan_data->num_speeds. Since the cooling state is later\nused as an array index in set_fan_speed(), an array out of bounds\naccess can occur.\nThis can be exploited by setting the state of the thermal cooling device\nto arbitrary values, causing for example a kernel oops when unavailable\nmemory is accessed this way.\n\nExample kernel oops:\n[  807.987276] Unable to handle kernel paging request at virtual address ffffff80d0588064\n[  807.987369] Mem abort info:\n[  807.987398]   ESR = 0x96000005\n[  807.987428]   EC = 0x25: DABT (current EL), IL = 32 bits\n[  807.987477]   SET = 0, FnV = 0\n[  807.987507]   EA = 0, S1PTW = 0\n[  807.987536]   FSC = 0x05: level 1 translation fault\n[  807.987570] Data abort info:\n[  807.987763]   ISV = 0, ISS = 0x00000005\n[  807.987801]   CM = 0, WnR = 0\n[  807.987832] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000001165000\n[  807.987872] [ffffff80d0588064] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000\n[  807.987961] Internal error: Oops: 96000005 [#1] PREEMPT SMP\n[  807.987992] Modules linked in: cmac algif_hash aes_arm64 algif_skcipher af_alg bnep hci_uart btbcm bluetooth ecdh_generic ecc 8021q garp stp llc snd_soc_hdmi_codec brcmfmac vc4 brcmutil cec drm_kms_helper snd_soc_core cfg80211 snd_compress bcm2835_codec(C) snd_pcm_dmaengine syscopyarea bcm2835_isp(C) bcm2835_v4l2(C) sysfillrect v4l2_mem2mem bcm2835_mmal_vchiq(C) raspberrypi_hwmon sysimgblt videobuf2_dma_contig videobuf2_vmalloc fb_sys_fops videobuf2_memops rfkill videobuf2_v4l2 videobuf2_common i2c_bcm2835 snd_bcm2835(C) videodev snd_pcm snd_timer snd mc vc_sm_cma(C) gpio_fan uio_pdrv_genirq uio drm fuse drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\n[  807.988508] CPU: 0 PID: 1321 Comm: bash Tainted: G         C        5.15.56-v8+ #1575\n[  807.988548] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\n[  807.988574] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  807.988608] pc : set_fan_speed.part.5+0x34/0x80 [gpio_fan]\n[  807.988654] lr : gpio_fan_set_cur_state+0x34/0x50 [gpio_fan]\n[  807.988691] sp : ffffffc008cf3bd0\n[  807.988710] x29: ffffffc008cf3bd0 x28: ffffff80019edac0 x27: 0000000000000000\n[  807.988762] x26: 0000000000000000 x25: 0000000000000000 x24: ffffff800747c920\n[  807.988787] x23: 000000000000000a x22: ffffff800369f000 x21: 000000001999997c\n[  807.988854] x20: ffffff800369f2e8 x19: ffffff8002ae8080 x18: 0000000000000000\n[  807.988877] x17: 0000000000000000 x16: 0000000000000000 x15: 000000559e271b70\n[  807.988938] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n[  807.988960] x11: 0000000000000000 x10: ffffffc008cf3c20 x9 : ffffffcfb60c741c\n[  807.989018] x8 : 000000000000000a x7 : 00000000ffffffc9 x6 : 0000000000000009\n[  807.989040] x5 : 000000000000002a x4 : 0000000000000000 x3 : ffffff800369f2e8\n[  807.989062] x2 : 000000000000e780 x1 : 0000000000000001 x0 : ffffff80d0588060\n[  807.989084] Call trace:\n[  807.989091]  set_fan_speed.part.5+0x34/0x80 [gpio_fan]\n[  807.989113]  gpio_fan_set_cur_state+0x34/0x50 [gpio_fan]\n[  807.989199]  cur_state_store+0x84/0xd0\n[  807.989221]  dev_attr_store+0x20/0x38\n[  807.989262]  sysfs_kf_write+0x4c/0x60\n[  807.989282]  kernfs_fop_write_iter+0x130/0x1c0\n[  807.989298]  new_sync_write+0x10c/0x190\n[  807.989315]  vfs_write+0x254/0x378\n[  807.989362]  ksys_write+0x70/0xf8\n[  807.989379]  __arm64_sys_write+0x24/0x30\n[  807.989424]  invoke_syscall+0x4c/0x110\n[  807.989442]  el0_svc_common.constprop.3+0xfc/0x120\n[  807.989458]  do_el0_svc+0x2c/0x90\n[  807.989473]  el0_svc+0x24/0x60\n[  807.989544]  el0t_64_sync_handler+0x90/0xb8\n[  807.989558]  el0t_64_sync+0x1a0/0x1a4\n[  807.989579] Code: b9403801 f9402800 7100003f 8b35cc00 (b9400416)\n[  807.989627] ---[ end t\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: hwmon: (gpio-fan) Corrección de acceso fuera de los límites a una matriz. El controlador no comprueba si el estado de refrigeración transferido a gpio_fan_set_cur_state() supera el estado de refrigeración máximo almacenado en fan_data->num_speeds. Dado que el estado de refrigeración se utiliza posteriormente como índice de matriz en set_fan_speed(), puede producirse un acceso fuera de los límites a una matriz. Esto se puede explotar configurando el estado del dispositivo de refrigeración térmica con valores arbitrarios, lo que provoca, por ejemplo, un error en el kernel al acceder a memoria no disponible de esta forma. Ejemplo de error de kernel: [807.987276] No se puede manejar la solicitud de paginación del kernel en la dirección virtual ffffff80d0588064 [807.987369] Información de aborto de memoria: [807.987398] ESR = 0x96000005 [807.987428] EC = 0x25: DABT (EL actual), IL = 32 bits [807.987477] SET = 0, FnV = 0 [807.987507] EA = 0, S1PTW = 0 [807.987536] FSC = 0x05: error de traducción de nivel 1 [807.987570] Información de aborto de datos: [ 807.987398] ESR = 0x96000005 [ 807.987428] EC = 0x25: DABT (current EL), IL = 32 bits [ 807.987477] SET = 0, FnV = 0 [ 807.987507] EA = 0, S1PTW = 0 [ 807.987536] FSC = 0x05: level 1 translation fault [ 807.987570] Data abort info: [ 807.987763] ISV = 0, ISS = 0x00000005 [ 807.987801] CM = 0, WnR = 0 [ 807.987832] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000001165000 [ 807.987872] [ffffff80d0588064] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [ 807.987961] Internal error: Oops: 96000005 [#1] PREEMPT SMP [ 807.987992] Modules linked in: cmac algif_hash aes_arm64 algif_skcipher af_alg bnep hci_uart btbcm bluetooth ecdh_generic ecc 8021q garp stp llc snd_soc_hdmi_codec brcmfmac vc4 brcmutil cec drm_kms_helper snd_soc_core cfg80211 snd_compress bcm2835_codec(C) snd_pcm_dmaengine syscopyarea bcm2835_isp(C) bcm2835_v4l2(C) sysfillrect v4l2_mem2mem bcm2835_mmal_vchiq(C) raspberrypi_hwmon sysimgblt videobuf2_dma_contig videobuf2_vmalloc fb_sys_fops videobuf2_memops rfkill videobuf2_v4l2 videobuf2_common i2c_bcm2835 snd_bcm2835(C) videodev snd_pcm snd_timer snd mc vc_sm_cma(C) gpio_fan uio_pdrv_genirq uio drm fuse drm_panel_orientation_quirks backlight ip_tables x_tables ipv6 [ 807.988508] CPU: 0 PID: 1321 Comm: bash Tainted: G C 5.15.56-v8+ #1575 [ 807.988548] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) [ 807.988574] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 807.988608] pc : set_fan_speed.part.5+0x34/0x80 [gpio_fan] [ 807.988654] lr : gpio_fan_set_cur_state+0x34/0x50 [gpio_fan] [ 807.988691] sp : ffffffc008cf3bd0 [ 807.988710] x29: ffffffc008cf3bd0 x28: ffffff80019edac0 x27: 0000000000000000 [ 807.988762] x26: 0000000000000000 x25: 0000000000000000 x24: ffffff800747c920 [ 807.988787] x23: 000000000000000a x22: ffffff800369f000 x21: 000000001999997c [ 807.988854] x20: ffffff800369f2e8 x19: ffffff8002ae8080 x18: 0000000000000000 [ 807.988877] x17: 0000000000000000 x16: 0000000000000000 x15: 000000559e271b70 [ 807.988938] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 807.988960] x11: 0000000000000000 x10: ffffffc008cf3c20 x9 : ffffffcfb60c741c [ 807.989018] x8 : 000000000000000a x7 : 00000000ffffffc9 x6 : 0000000000000009 [ 807.989040] x5 : 000000000000002a x4 : 0000000000000000 x3 : ffffff800369f2e8 [ 807.989062] x2 : 000000000000e780 x1 : 0000000000000001 x0 : ffffff80d0588060 [ 807.989084] Call trace: [ 807.989091] set_fan_speed.part.5+0x34/0x80 [gpio_fan] [ 807.989113] gpio_fan_set_cur_state+0x34/0x50 [gpio_fan] [ 807.989199] cur_state_store+0x84/0xd0 [ 807.989221] dev_attr_store+0x20/0x38 [ 807.989262] sysfs_kf_write+0x4c/0x60 [ 807.989282] kernfs_fop_write_iter+0x130/0x1c0 [ 807.989298] new_sync_write+0x10c/0x190 [ 807.989315] vfs_write+0x254/0x378 [ 807.989362] ksys_write+0x70/0xf8 [ 807.989379] __arm64_sys_write+0x24/0x30 [ 807.989424] invoke_syscall+0x4c/0x110 [ 807.989442] ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T05:19:35.510",
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