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CVE-2026-23163

Estado: AnalizadaMedia (5.5)—

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

drm/amdgpu: fix NULL pointer dereference in amdgpu_gmc_filter_faults_remove

On APUs such as Raven and Renoir (GC 9.1.0, 9.2.2, 9.3.0), the ih1 and ih2 interrupt ring buffers are not initialized. This is by design, as these secondary IH rings are only available on discrete GPUs. See vega10_ih_sw_init() which explicitly skips ih1/ih2 initialization when AMD_IS_APU is set.

However, amdgpu_gmc_filter_faults_remove() unconditionally uses ih1 to get the timestamp of the last interrupt entry. When retry faults are enabled on APUs (noretry=0), this function is called from the SVM page fault recovery path, resulting in a NULL pointer dereference when amdgpu_ih_decode_iv_ts_helper() attempts to access ih->ring[].

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The crash manifests as:

This issue was exposed by commit 1446226d32a4 ("drm/amdgpu: Remove GC HW IP 9.3.0 from noretry=1") which changed the default for Renoir APU from noretry=1 to noretry=0, enabling retry fault handling and thus exercising the buggy code path.

Fix this by adding a check for ih1.ring_size before attempting to use it. Also restore the soft_ih support from commit dd299441654f ("drm/amdgpu: Rework retry fault removal"). This is needed if the hardware doesn't support secondary HW IH rings.

v2: additional updates (Alex)

(cherry picked from commit 6ce8d536c80aa1f059e82184f0d1994436b1d526)

Detalles técnicos trazas, registros y código del informe original
  BUG: kernel NULL pointer dereference, address: 0000000000000004
  RIP: 0010:amdgpu_ih_decode_iv_ts_helper+0x22/0x40 [amdgpu]
  Call Trace:
   amdgpu_gmc_filter_faults_remove+0x60/0x130 [amdgpu]
   svm_range_restore_pages+0xae5/0x11c0 [amdgpu]
   amdgpu_vm_handle_fault+0xc8/0x340 [amdgpu]
   gmc_v9_0_process_interrupt+0x191/0x220 [amdgpu]
   amdgpu_irq_dispatch+0xed/0x2c0 [amdgpu]
   amdgpu_ih_process+0x84/0x100 [amdgpu]

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23163",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "published": "2026-02-14T16:15:56.483",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-476"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix NULL pointer dereference in amdgpu_gmc_filter_faults_remove\n\nOn APUs such as Raven and Renoir (GC 9.1.0, 9.2.2, 9.3.0), the ih1 and\nih2 interrupt ring buffers are not initialized. This is by design, as\nthese secondary IH rings are only available on discrete GPUs. See\nvega10_ih_sw_init() which explicitly skips ih1/ih2 initialization when\nAMD_IS_APU is set.\n\nHowever, amdgpu_gmc_filter_faults_remove() unconditionally uses ih1 to\nget the timestamp of the last interrupt entry. When retry faults are\nenabled on APUs (noretry=0), this function is called from the SVM page\nfault recovery path, resulting in a NULL pointer dereference when\namdgpu_ih_decode_iv_ts_helper() attempts to access ih->ring[].\n\nThe crash manifests as:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000004\n  RIP: 0010:amdgpu_ih_decode_iv_ts_helper+0x22/0x40 [amdgpu]\n  Call Trace:\n   amdgpu_gmc_filter_faults_remove+0x60/0x130 [amdgpu]\n   svm_range_restore_pages+0xae5/0x11c0 [amdgpu]\n   amdgpu_vm_handle_fault+0xc8/0x340 [amdgpu]\n   gmc_v9_0_process_interrupt+0x191/0x220 [amdgpu]\n   amdgpu_irq_dispatch+0xed/0x2c0 [amdgpu]\n   amdgpu_ih_process+0x84/0x100 [amdgpu]\n\nThis issue was exposed by commit 1446226d32a4 (\"drm/amdgpu: Remove GC HW\nIP 9.3.0 from noretry=1\") which changed the default for Renoir APU from\nnoretry=1 to noretry=0, enabling retry fault handling and thus\nexercising the buggy code path.\n\nFix this by adding a check for ih1.ring_size before attempting to use\nit. Also restore the soft_ih support from commit dd299441654f (\"drm/amdgpu:\nRework retry fault removal\").  This is needed if the hardware doesn't\nsupport secondary HW IH rings.\n\nv2: additional updates (Alex)\n\n(cherry picked from commit 6ce8d536c80aa1f059e82184f0d1994436b1d526)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amdgpu: corrige la desreferenciación de puntero NULL en amdgpu_gmc_filter_faults_remove\n\nEn APUs como Raven y Renoir (GC 9.1.0, 9.2.2, 9.3.0), los búferes de anillo de interrupción ih1 e ih2 no están inicializados. Esto es intencional, ya que estos anillos IH secundarios solo están disponibles en GPUs discretas. Véase vega10_ih_sw_init() que explícitamente omite la inicialización de ih1/ih2 cuando AMD_IS_APU está configurado.\n\nSin embargo, amdgpu_gmc_filter_faults_remove() usa incondicionalmente ih1 para obtener la marca de tiempo de la última entrada de interrupción. Cuando las fallas de reintento están habilitadas en APUs (noretry=0), esta función es llamada desde la ruta de recuperación de fallas de página SVM, lo que resulta en una desreferenciación de puntero NULL cuando amdgpu_ih_decode_iv_ts_helper() intenta acceder a ih->ring[].\n\nEl fallo se manifiesta como:\n\n  BUG: desreferenciación de puntero NULL del kernel, dirección: 0000000000000004\n  RIP: 0010:amdgpu_ih_decode_iv_ts_helper+0x22/0x40 [amdgpu]\n  Call Trace:\n   amdgpu_gmc_filter_faults_remove+0x60/0x130 [amdgpu]\n   svm_range_restore_pages+0xae5/0x11c0 [amdgpu]\n   amdgpu_vm_handle_fault+0xc8/0x340 [amdgpu]\n   gmc_v9_0_process_interrupt+0x191/0x220 [amdgpu]\n   amdgpu_irq_dispatch+0xed/0x2c0 [amdgpu]\n   amdgpu_ih_process+0x84/0x100 [amdgpu]\n\nEste problema fue expuesto por el commit 1446226d32a4 ('drm/amdgpu: Eliminar GC HW IP 9.3.0 de noretry=1') que cambió el valor predeterminado para la APU Renoir de noretry=1 a noretry=0, habilitando el manejo de fallas de reintento y, por lo tanto, ejercitando la ruta de código defectuosa.\n\nSolucione esto añadiendo una comprobación para ih1.ring_size antes de intentar usarlo. También restaure el soporte soft_ih del commit dd299441654f ('drm/amdgpu: Reestructurar la eliminación de fallas de reintento'). Esto es necesario si el hardware no soporta anillos IH de hardware secundarios.\n\nv2: actualizaciones adicionales (Alex)\n\n(seleccionado de commit 6ce8d536c80aa1f059e82184f0d1994436b1d526)"
    }
  ],
  "lastModified": "2026-06-17T10:21:00.997",
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