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CVE-2022-50398

Estado: ModificadaMedia (5.5)—

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

drm/msm/dp: add atomic_check to bridge ops

DRM commit_tails() will disable downstream crtc/encoder/bridge if both disable crtc is required and crtc->active is set before pushing a new frame downstream.

There is a rare case that user space display manager issue an extra screen update immediately followed by close DRM device while down stream display interface is disabled. This extra screen update will timeout due to the downstream interface is disabled but will cause crtc->active be set.

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Hence the followed commit_tails() called by drm_release() will pass the disable downstream crtc/encoder/bridge conditions checking even downstream interface is disabled. This cause the crash to happen at dp_bridge_disable() due to it trying to access the main link register to push the idle pattern out while main link clocks is disabled.

This patch adds atomic_check to prevent the extra frame will not be pushed down if display interface is down so that crtc->active will not be set neither. This will fail the conditions checking of disabling down stream crtc/encoder/bridge which prevent drm_release() from calling dp_bridge_disable() so that crash at dp_bridge_disable() prevented.

There is no protection in the DRM framework to check if the display pipeline has been already disabled before trying again. The only check is the crtc_state->active but this is controlled by usermode using UAPI. Hence if the usermode sets this and then crashes, the driver needs to protect against double disable.

Detalles técnicos trazas, registros y código del informe original
SError Interrupt on CPU7, code 0x00000000be000411 -- SError
CPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19
Hardware name: Google Lazor (rev3 - 8) (DT)
pstate: a04000c9 (NzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __cmpxchg_case_acq_32+0x14/0x2c
lr : do_raw_spin_lock+0xa4/0xdc
sp : ffffffc01092b6a0
x29: ffffffc01092b6a0 x28: 0000000000000028 x27: 0000000000000038
x26: 0000000000000004 x25: ffffffd2973dce48 x24: 0000000000000000
x23: 00000000ffffffff x22: 00000000ffffffff x21: ffffffd2978d0008
x20: ffffffd2978d0008 x19: ffffff80ff759fc0 x18: 0000000000000000
x17: 004800a501260460 x16: 0441043b04600438 x15: 04380000089807d0
x14: 07b0089807800780 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000438 x10: 00000000000007d0 x9 : ffffffd2973e09e4
x8 : ffffff8092d53300 x7 : ffffff808902e8b8 x6 : 0000000000000001
x5 : ffffff808902e880 x4 : 0000000000000000 x3 : ffffff80ff759fc0
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffff80ff759fc0
Kernel panic - not syncing: Asynchronous SError Interrupt
CPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19
Hardware name: Google Lazor (rev3 - 8) (DT)
Call trace:
 dump_backtrace.part.0+0xbc/0xe4
 show_stack+0x24/0x70
 dump_stack_lvl+0x68/0x84
 dump_stack+0x18/0x34
 panic+0x14c/0x32c
 nmi_panic+0x58/0x7c
 arm64_serror_panic+0x78/0x84
 do_serror+0x40/0x64
 el1h_64_error_handler+0x30/0x48
 el1h_64_error+0x68/0x6c
 __cmpxchg_case_acq_32+0x14/0x2c
 _raw_spin_lock_irqsave+0x38/0x4c
 lock_timer_base+0x40/0x78
 __mod_timer+0xf4/0x25c
 schedule_timeout+0xd4/0xfc
 __wait_for_common+0xac/0x140
 wait_for_completion_timeout+0x2c/0x54
 dp_ctrl_push_idle+0x40/0x88
 dp_bridge_disable+0x24/0x30
 drm_atomic_bridge_chain_disable+0x90/0xbc
 drm_atomic_helper_commit_modeset_disables+0x198/0x444
 msm_atomic_commit_tail+0x1d0/0x374
 commit_tail+0x80/0x108
 drm_atomic_helper_commit+0x118/0x11c
 drm_atomic_commit+0xb4/0xe0
 drm_client_modeset_commit_atomic+0x184/0x224
 drm_client_modeset_commit_locked+0x58/0x160
 drm_client_modeset_commit+0x3c/0x64
 __drm_fb_helper_restore_fbdev_mode_unlocked+0x98/0xac
 drm_fb_helper_set_par+0x74/0x80
 drm_fb_helper_hotplug_event+0xdc/0xe0
 __drm_fb_helper_restore_fbdev_mode_unlocked+0x7c/0xac
 drm_fb_helper_restore_fbdev_mode_unlocked+0x20/0x2c
 drm_fb_helper_lastclose+0x20/0x2c
 drm_lastclose+0x44/0x6c
 drm_release+0x88/0xd4
 __fput+0x104/0x220
 ____fput+0x1c/0x28
 task_work_run+0x8c/0x100
 d
---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)

Mostrar
{
  "id": "CVE-2022-50398",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-50398",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-14T18:52:11.243292Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
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          "version": "3.1",
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          "attackVector": "LOCAL",
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
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      }
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  },
  "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": [
            {
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              "lessThan": "d106b866439c63a618d020477bfbe7b46c759657",
              "versionType": "git"
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              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/msm/dp/dp_drm.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.17",
              "versionType": "semver"
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            {
              "status": "unaffected",
              "version": "6.0.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/msm/dp/dp_drm.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-09-18T14:15:39.000",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3a661247967a6f3c99a95a8ba4c8073c5846ea4b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d106b866439c63a618d020477bfbe7b46c759657",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dp: add atomic_check to bridge ops\n\nDRM commit_tails() will disable downstream crtc/encoder/bridge if\nboth disable crtc is required and crtc->active is set before pushing\na new frame downstream.\n\nThere is a rare case that user space display manager issue an extra\nscreen update immediately followed by close DRM device while down\nstream display interface is disabled. This extra screen update will\ntimeout due to the downstream interface is disabled but will cause\ncrtc->active be set. Hence the followed commit_tails() called by\ndrm_release() will pass the disable downstream crtc/encoder/bridge\nconditions checking even downstream interface is disabled.\nThis cause the crash to happen at dp_bridge_disable() due to it trying\nto access the main link register to push the idle pattern out while main\nlink clocks is disabled.\n\nThis patch adds atomic_check to prevent the extra frame will not\nbe pushed down if display interface is down so that crtc->active\nwill not be set neither. This will fail the conditions checking\nof disabling down stream crtc/encoder/bridge which prevent\ndrm_release() from calling dp_bridge_disable() so that crash\nat dp_bridge_disable() prevented.\n\nThere is no protection in the DRM framework to check if the display\npipeline has been already disabled before trying again. The only\ncheck is the crtc_state->active but this is controlled by usermode\nusing UAPI. Hence if the usermode sets this and then crashes, the\ndriver needs to protect against double disable.\n\nSError Interrupt on CPU7, code 0x00000000be000411 -- SError\nCPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19\nHardware name: Google Lazor (rev3 - 8) (DT)\npstate: a04000c9 (NzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __cmpxchg_case_acq_32+0x14/0x2c\nlr : do_raw_spin_lock+0xa4/0xdc\nsp : ffffffc01092b6a0\nx29: ffffffc01092b6a0 x28: 0000000000000028 x27: 0000000000000038\nx26: 0000000000000004 x25: ffffffd2973dce48 x24: 0000000000000000\nx23: 00000000ffffffff x22: 00000000ffffffff x21: ffffffd2978d0008\nx20: ffffffd2978d0008 x19: ffffff80ff759fc0 x18: 0000000000000000\nx17: 004800a501260460 x16: 0441043b04600438 x15: 04380000089807d0\nx14: 07b0089807800780 x13: 0000000000000000 x12: 0000000000000000\nx11: 0000000000000438 x10: 00000000000007d0 x9 : ffffffd2973e09e4\nx8 : ffffff8092d53300 x7 : ffffff808902e8b8 x6 : 0000000000000001\nx5 : ffffff808902e880 x4 : 0000000000000000 x3 : ffffff80ff759fc0\nx2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffff80ff759fc0\nKernel panic - not syncing: Asynchronous SError Interrupt\nCPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19\nHardware name: Google Lazor (rev3 - 8) (DT)\nCall trace:\n dump_backtrace.part.0+0xbc/0xe4\n show_stack+0x24/0x70\n dump_stack_lvl+0x68/0x84\n dump_stack+0x18/0x34\n panic+0x14c/0x32c\n nmi_panic+0x58/0x7c\n arm64_serror_panic+0x78/0x84\n do_serror+0x40/0x64\n el1h_64_error_handler+0x30/0x48\n el1h_64_error+0x68/0x6c\n __cmpxchg_case_acq_32+0x14/0x2c\n _raw_spin_lock_irqsave+0x38/0x4c\n lock_timer_base+0x40/0x78\n __mod_timer+0xf4/0x25c\n schedule_timeout+0xd4/0xfc\n __wait_for_common+0xac/0x140\n wait_for_completion_timeout+0x2c/0x54\n dp_ctrl_push_idle+0x40/0x88\n dp_bridge_disable+0x24/0x30\n drm_atomic_bridge_chain_disable+0x90/0xbc\n drm_atomic_helper_commit_modeset_disables+0x198/0x444\n msm_atomic_commit_tail+0x1d0/0x374\n commit_tail+0x80/0x108\n drm_atomic_helper_commit+0x118/0x11c\n drm_atomic_commit+0xb4/0xe0\n drm_client_modeset_commit_atomic+0x184/0x224\n drm_client_modeset_commit_locked+0x58/0x160\n drm_client_modeset_commit+0x3c/0x64\n __drm_fb_helper_restore_fbdev_mode_unlocked+0x98/0xac\n drm_fb_helper_set_par+0x74/0x80\n drm_fb_helper_hotplug_event+0xdc/0xe0\n __drm_fb_helper_restore_fbdev_mode_unlocked+0x7c/0xac\n drm_fb_helper_restore_fbdev_mode_unlocked+0x20/0x2c\n drm_fb_helper_lastclose+0x20/0x2c\n drm_lastclose+0x44/0x6c\n drm_release+0x88/0xd4\n __fput+0x104/0x220\n ____fput+0x1c/0x28\n task_work_run+0x8c/0x100\n d\n---truncated---"
    }
  ],
  "lastModified": "2026-06-17T05:23:27.137",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}