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CVE-2025-38104

Estado: AnalizadaMedia (4.7)—

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

drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversion in SRIOV

RLCG Register Access is a way for virtual functions to safely access GPU registers in a virtualized environment., including TLB flushes and register reads. When multiple threads or VFs try to access the same registers simultaneously, it can lead to race conditions. By using the RLCG interface, the driver can serialize access to the registers.

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This means that only one thread can access the registers at a time, preventing conflicts and ensuring that operations are performed correctly. Additionally, when a low-priority task holds a mutex that a high-priority task needs, ie., If a thread holding a spinlock tries to acquire a mutex, it can lead to priority inversion. register access in amdgpu_virt_rlcg_reg_rw especially in a fast code path is critical.

The call stack shows that the function amdgpu_virt_rlcg_reg_rw is being called, which attempts to acquire the mutex. This function is invoked from amdgpu_sriov_wreg, which in turn is called from gmc_v11_0_flush_gpu_tlb.

The [ BUG: Invalid wait context ] indicates that a thread is trying to acquire a mutex while it is in a context that does not allow it to sleep (like holding a spinlock).

Fixes the below:

Detalles técnicos trazas, registros y código del informe original
[  253.013423] =============================
[  253.013434] [ BUG: Invalid wait context ]
[  253.013446] 6.12.0-amdstaging-drm-next-lol-050225 #14 Tainted: G     U     OE
[  253.013464] -----------------------------
[  253.013475] kworker/0:1/10 is trying to lock:
[  253.013487] ffff9f30542e3cf8 (&adev->virt.rlcg_reg_lock){+.+.}-{3:3}, at: amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]
[  253.013815] other info that might help us debug this:
[  253.013827] context-{4:4}
[  253.013835] 3 locks held by kworker/0:1/10:
[  253.013847]  #0: ffff9f3040050f58 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x3f5/0x680
[  253.013877]  #1: ffffb789c008be40 ((work_completion)(&wfc.work)){+.+.}-{0:0}, at: process_one_work+0x1d6/0x680
[  253.013905]  #2: ffff9f3054281838 (&adev->gmc.invalidate_lock){+.+.}-{2:2}, at: gmc_v11_0_flush_gpu_tlb+0x198/0x4f0 [amdgpu]
[  253.014154] stack backtrace:
[  253.014164] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G     U     OE      6.12.0-amdstaging-drm-next-lol-050225 #14
[  253.014189] Tainted: [U]=USER, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[  253.014203] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/18/2024
[  253.014224] Workqueue: events work_for_cpu_fn
[  253.014241] Call Trace:
[  253.014250]  <TASK>
[  253.014260]  dump_stack_lvl+0x9b/0xf0
[  253.014275]  dump_stack+0x10/0x20
[  253.014287]  __lock_acquire+0xa47/0x2810
[  253.014303]  ? srso_alias_return_thunk+0x5/0xfbef5
[  253.014321]  lock_acquire+0xd1/0x300
[  253.014333]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]
[  253.014562]  ? __lock_acquire+0xa6b/0x2810
[  253.014578]  __mutex_lock+0x85/0xe20
[  253.014591]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]
[  253.014782]  ? sched_clock_noinstr+0x9/0x10
[  253.014795]  ? srso_alias_return_thunk+0x5/0xfbef5
[  253.014808]  ? local_clock_noinstr+0xe/0xc0
[  253.014822]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]
[  253.015012]  ? srso_alias_return_thunk+0x5/0xfbef5
[  253.015029]  mutex_lock_nested+0x1b/0x30
[  253.015044]  ? mutex_lock_nested+0x1b/0x30
[  253.015057]  amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]
[  253.015249]  amdgpu_sriov_wreg+0xc5/0xd0 [amdgpu]
[  253.015435]  gmc_v11_0_flush_gpu_tlb+0x44b/0x4f0 [amdgpu]
[  253.015667]  gfx_v11_0_hw_init+0x499/0x29c0 [amdgpu]
[  253.015901]  ? __pfx_smu_v13_0_update_pcie_parameters+0x10/0x10 [amdgpu]
[  253.016159]  ? srso_alias_return_thunk+0x5/0xfbef5
[  253.016173]  ? smu_hw_init+0x18d/0x300 [amdgpu]
[  253.016403]  amdgpu_device_init+0x29ad/0x36a0 [amdgpu]
[  253.016614]  amdgpu_driver_load_kms+0x1a/0xc0 [amdgpu]
[  253.0170
---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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-38104",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
      }
    ]
  },
  "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": "f39a3bc42815a7016a915f6cb35e9a1448788f06",
              "lessThan": "dd450b513718dfeb4c637c9335d51a55ebcd4320",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1adb5ebe205e96af77a93512e2d5b8c437548787",
              "lessThan": "d1bda2ab0cf956a16dd369a473a6c43dfbed5855",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e864180ee49b4d30e640fd1e1d852b86411420c9",
              "lessThan": "07ed75bfa7ede8bfcfa303fd6efc85db1c8684c7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e864180ee49b4d30e640fd1e1d852b86411420c9",
              "lessThan": "1c0378830e42c98acd69e0289882c8637d92f285",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e864180ee49b4d30e640fd1e1d852b86411420c9",
              "lessThan": "5c1741a0c176ae11675a64cb7f2dd21d72db6b91",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e864180ee49b4d30e640fd1e1d852b86411420c9",
              "lessThan": "dc0297f3198bd60108ccbd167ee5d9fa4af31ed0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e1ab38e99d1607f80a1670a399511a56464c0253",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.1.105",
              "lessThan": "6.1.162",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.46",
              "lessThan": "6.6.123",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.10.5",
              "lessThan": "6.11",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.123",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.39",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.11",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-04-18T07:15:43.290",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/07ed75bfa7ede8bfcfa303fd6efc85db1c8684c7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1c0378830e42c98acd69e0289882c8637d92f285",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5c1741a0c176ae11675a64cb7f2dd21d72db6b91",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d1bda2ab0cf956a16dd369a473a6c43dfbed5855",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc0297f3198bd60108ccbd167ee5d9fa4af31ed0",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dd450b513718dfeb4c637c9335d51a55ebcd4320",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversion in SRIOV\n\nRLCG Register Access is a way for virtual functions to safely access GPU\nregisters in a virtualized environment., including TLB flushes and\nregister reads. When multiple threads or VFs try to access the same\nregisters simultaneously, it can lead to race conditions. By using the\nRLCG interface, the driver can serialize access to the registers. This\nmeans that only one thread can access the registers at a time,\npreventing conflicts and ensuring that operations are performed\ncorrectly. Additionally, when a low-priority task holds a mutex that a\nhigh-priority task needs, ie., If a thread holding a spinlock tries to\nacquire a mutex, it can lead to priority inversion. register access in\namdgpu_virt_rlcg_reg_rw especially in a fast code path is critical.\n\nThe call stack shows that the function amdgpu_virt_rlcg_reg_rw is being\ncalled, which attempts to acquire the mutex. This function is invoked\nfrom amdgpu_sriov_wreg, which in turn is called from\ngmc_v11_0_flush_gpu_tlb.\n\nThe [ BUG: Invalid wait context ] indicates that a thread is trying to\nacquire a mutex while it is in a context that does not allow it to sleep\n(like holding a spinlock).\n\nFixes the below:\n\n[  253.013423] =============================\n[  253.013434] [ BUG: Invalid wait context ]\n[  253.013446] 6.12.0-amdstaging-drm-next-lol-050225 #14 Tainted: G     U     OE\n[  253.013464] -----------------------------\n[  253.013475] kworker/0:1/10 is trying to lock:\n[  253.013487] ffff9f30542e3cf8 (&adev->virt.rlcg_reg_lock){+.+.}-{3:3}, at: amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]\n[  253.013815] other info that might help us debug this:\n[  253.013827] context-{4:4}\n[  253.013835] 3 locks held by kworker/0:1/10:\n[  253.013847]  #0: ffff9f3040050f58 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x3f5/0x680\n[  253.013877]  #1: ffffb789c008be40 ((work_completion)(&wfc.work)){+.+.}-{0:0}, at: process_one_work+0x1d6/0x680\n[  253.013905]  #2: ffff9f3054281838 (&adev->gmc.invalidate_lock){+.+.}-{2:2}, at: gmc_v11_0_flush_gpu_tlb+0x198/0x4f0 [amdgpu]\n[  253.014154] stack backtrace:\n[  253.014164] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G     U     OE      6.12.0-amdstaging-drm-next-lol-050225 #14\n[  253.014189] Tainted: [U]=USER, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n[  253.014203] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/18/2024\n[  253.014224] Workqueue: events work_for_cpu_fn\n[  253.014241] Call Trace:\n[  253.014250]  <TASK>\n[  253.014260]  dump_stack_lvl+0x9b/0xf0\n[  253.014275]  dump_stack+0x10/0x20\n[  253.014287]  __lock_acquire+0xa47/0x2810\n[  253.014303]  ? srso_alias_return_thunk+0x5/0xfbef5\n[  253.014321]  lock_acquire+0xd1/0x300\n[  253.014333]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]\n[  253.014562]  ? __lock_acquire+0xa6b/0x2810\n[  253.014578]  __mutex_lock+0x85/0xe20\n[  253.014591]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]\n[  253.014782]  ? sched_clock_noinstr+0x9/0x10\n[  253.014795]  ? srso_alias_return_thunk+0x5/0xfbef5\n[  253.014808]  ? local_clock_noinstr+0xe/0xc0\n[  253.014822]  ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]\n[  253.015012]  ? srso_alias_return_thunk+0x5/0xfbef5\n[  253.015029]  mutex_lock_nested+0x1b/0x30\n[  253.015044]  ? mutex_lock_nested+0x1b/0x30\n[  253.015057]  amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu]\n[  253.015249]  amdgpu_sriov_wreg+0xc5/0xd0 [amdgpu]\n[  253.015435]  gmc_v11_0_flush_gpu_tlb+0x44b/0x4f0 [amdgpu]\n[  253.015667]  gfx_v11_0_hw_init+0x499/0x29c0 [amdgpu]\n[  253.015901]  ? __pfx_smu_v13_0_update_pcie_parameters+0x10/0x10 [amdgpu]\n[  253.016159]  ? srso_alias_return_thunk+0x5/0xfbef5\n[  253.016173]  ? smu_hw_init+0x18d/0x300 [amdgpu]\n[  253.016403]  amdgpu_device_init+0x29ad/0x36a0 [amdgpu]\n[  253.016614]  amdgpu_driver_load_kms+0x1a/0xc0 [amdgpu]\n[  253.0170\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: Reemplazar Mutex con Spinlock para el acceso a registros RLCG para evitar la inversión de prioridad en SRIOV. El acceso a registros RLCG es una forma de que las funciones virtuales accedan de forma segura a los registros de la GPU en un entorno virtualizado, incluyendo vaciados de TLB y lecturas de registros. Cuando varios subprocesos o VF intentan acceder a los mismos registros simultáneamente, puede provocar condiciones de ejecución. Al usar la interfaz RLCG, el controlador puede serializar el acceso a los registros. Esto significa que solo un subproceso puede acceder a los registros a la vez, lo que evita conflictos y garantiza que las operaciones se realicen correctamente. Además, cuando una tarea de baja prioridad contiene un mutex que necesita una tarea de alta prioridad (es decir, si un subproceso con un spinlock intenta adquirir un mutex), puede provocar una inversión de prioridad. El acceso a registros en amdgpu_virt_rlcg_reg_rw, especialmente en una ruta de código rápida, es crítico. La pila de llamadas muestra que se está llamando a la función amdgpu_virt_rlcg_reg_rw, que intenta adquirir el mutex. Esta función se invoca desde amdgpu_sriov_wreg, que a su vez se llama desde gmc_v11_0_flush_gpu_tlb. El error [ERROR: Contexto de espera no válido] indica que un subproceso intenta adquirir un mutex mientras se encuentra en un contexto que no le permite dormir (como mantener un spinlock). Corrige lo siguiente: [253.013423] ============================== [253.013434] [ERROR: Contexto de espera no válido] [253.013446] 6.12.0-amdstaging-drm-next-lol-050225 #14 Contaminado: G U OE [ 253.013464] ----------------------------- [ 253.013475] kworker/0:1/10 is trying to lock: [ 253.013487] ffff9f30542e3cf8 (&amp;adev-&gt;virt.rlcg_reg_lock){+.+.}-{3:3}, at: amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu] [ 253.013815] other info that might help us debug this: [ 253.013827] context-{4:4} [ 253.013835] 3 locks held by kworker/0:1/10: [ 253.013847] #0: ffff9f3040050f58 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x3f5/0x680 [ 253.013877] #1: ffffb789c008be40 ((work_completion)(&amp;wfc.work)){+.+.}-{0:0}, at: process_one_work+0x1d6/0x680 [ 253.013905] #2: ffff9f3054281838 (&amp;adev-&gt;gmc.invalidate_lock){+.+.}-{2:2}, at: gmc_v11_0_flush_gpu_tlb+0x198/0x4f0 [amdgpu] [ 253.014154] stack backtrace: [ 253.014164] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G U OE 6.12.0-amdstaging-drm-next-lol-050225 #14 [ 253.014189] Tainted: [U]=USER, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE [ 253.014203] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/18/2024 [ 253.014224] Workqueue: events work_for_cpu_fn [ 253.014241] Call Trace: [ 253.014250]  [ 253.014260] dump_stack_lvl+0x9b/0xf0 [ 253.014275] dump_stack+0x10/0x20 [ 253.014287] __lock_acquire+0xa47/0x2810 [ 253.014303] ? srso_alias_return_thunk+0x5/0xfbef5 [ 253.014321] lock_acquire+0xd1/0x300 [ 253.014333] ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu] [ 253.014562] ? __lock_acquire+0xa6b/0x2810 [ 253.014578] __mutex_lock+0x85/0xe20 [ 253.014591] ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu] [ 253.014782] ? sched_clock_noinstr+0x9/0x10 [ 253.014795] ? srso_alias_return_thunk+0x5/0xfbef5 [ 253.014808] ? local_clock_noinstr+0xe/0xc0 [ 253.014822] ? amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu] [ 253.015012] ? srso_alias_return_thunk+0x5/0xfbef5 [ 253.015029] mutex_lock_nested+0x1b/0x30 [ 253.015044] ? mutex_lock_nested+0x1b/0x30 [ 253.015057] amdgpu_virt_rlcg_reg_rw+0xf6/0x330 [amdgpu] [ 253.015249] amdgpu_sriov_wreg+0xc5/0xd0 [amdgpu] [ 253.015435] gmc_v11_0_flush_gpu_tlb+0x44b/0x4f0 [amdgpu] [ 253.015667] gfx_v11_0_hw_init+0x499/0x29c0 [amdgpu] [ 253.015901] ? __pfx_smu_v13_0_update_pcie_parameters+0x10/0x10 [amdgpu] [ 253.016159] ? srso_alias_return_thunk+0x5/0xfbef5 [ 253.016173] ? smu_hw_init+0x18d/0x300 [amdgpu] [ 253.016403] amdgpu_device_init+0x29ad/0x36a0 [amdgpu] [ 253.016614] amdgpu_driver_load_kms+0x1a/0xc0 [amdgpu]  ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T09:16:03.740",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3C1CF6BD-119A-4E7E-87C2-10661A098361",
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