CVE-2026-31488 (GCVE-0-2026-31488)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-08-17 12:04
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Do not skip unrelated mode changes in DSC validation Starting with commit 17ce8a6907f7 ("drm/amd/display: Add dsc pre-validation in atomic check"), amdgpu resets the CRTC state mode_changed flag to false when recomputing the DSC configuration results in no timing change for a particular stream. However, this is incorrect in scenarios where a change in MST/DSC configuration happens in the same KMS commit as another (unrelated) mode change. For example, the integrated panel of a laptop may be configured differently (e.g., HDR enabled/disabled) depending on whether external screens are attached. In this case, plugging in external DP-MST screens may result in the mode_changed flag being dropped incorrectly for the integrated panel if its DSC configuration did not change during precomputation in pre_validate_dsc(). At this point, however, dm_update_crtc_state() has already created new streams for CRTCs with DSC-independent mode changes. In turn, amdgpu_dm_commit_streams() will never release the old stream, resulting in a memory leak. amdgpu_dm_atomic_commit_tail() will never acquire a reference to the new stream either, which manifests as a use-after-free when the stream gets disabled later on: BUG: KASAN: use-after-free in dc_stream_release+0x25/0x90 [amdgpu] Write of size 4 at addr ffff88813d836524 by task kworker/9:9/29977 Workqueue: events drm_mode_rmfb_work_fn Call Trace: <TASK> dump_stack_lvl+0x6e/0xa0 print_address_description.constprop.0+0x88/0x320 ? dc_stream_release+0x25/0x90 [amdgpu] print_report+0xfc/0x1ff ? srso_alias_return_thunk+0x5/0xfbef5 ? __virt_addr_valid+0x225/0x4e0 ? dc_stream_release+0x25/0x90 [amdgpu] kasan_report+0xe1/0x180 ? dc_stream_release+0x25/0x90 [amdgpu] kasan_check_range+0x125/0x200 dc_stream_release+0x25/0x90 [amdgpu] dc_state_destruct+0x14d/0x5c0 [amdgpu] dc_state_release.part.0+0x4e/0x130 [amdgpu] dm_atomic_destroy_state+0x3f/0x70 [amdgpu] drm_atomic_state_default_clear+0x8ee/0xf30 ? drm_mode_object_put.part.0+0xb1/0x130 __drm_atomic_state_free+0x15c/0x2d0 atomic_remove_fb+0x67e/0x980 Since there is no reliable way of figuring out whether a CRTC has unrelated mode changes pending at the time of DSC validation, remember the value of the mode_changed flag from before the point where a CRTC was marked as potentially affected by a change in DSC configuration. Reset the mode_changed flag to this earlier value instead in pre_validate_dsc(). (cherry picked from commit cc7c7121ae082b7b82891baa7280f1ff2608f22b)
References
Impacted products
Vendor Product Version
Linux Linux Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
Version: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
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                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Do not skip unrelated mode changes in DSC validation\n\nStarting with commit 17ce8a6907f7 (\"drm/amd/display: Add dsc pre-validation in\natomic check\"), amdgpu resets the CRTC state mode_changed flag to false when\nrecomputing the DSC configuration results in no timing change for a particular\nstream.\n\nHowever, this is incorrect in scenarios where a change in MST/DSC configuration\nhappens in the same KMS commit as another (unrelated) mode change. For example,\nthe integrated panel of a laptop may be configured differently (e.g., HDR\nenabled/disabled) depending on whether external screens are attached. In this\ncase, plugging in external DP-MST screens may result in the mode_changed flag\nbeing dropped incorrectly for the integrated panel if its DSC configuration\ndid not change during precomputation in pre_validate_dsc().\n\nAt this point, however, dm_update_crtc_state() has already created new streams\nfor CRTCs with DSC-independent mode changes. In turn,\namdgpu_dm_commit_streams() will never release the old stream, resulting in a\nmemory leak. amdgpu_dm_atomic_commit_tail() will never acquire a reference to\nthe new stream either, which manifests as a use-after-free when the stream gets\ndisabled later on:\n\nBUG: KASAN: use-after-free in dc_stream_release+0x25/0x90 [amdgpu]\nWrite of size 4 at addr ffff88813d836524 by task kworker/9:9/29977\n\nWorkqueue: events drm_mode_rmfb_work_fn\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x6e/0xa0\n print_address_description.constprop.0+0x88/0x320\n ? dc_stream_release+0x25/0x90 [amdgpu]\n print_report+0xfc/0x1ff\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __virt_addr_valid+0x225/0x4e0\n ? dc_stream_release+0x25/0x90 [amdgpu]\n kasan_report+0xe1/0x180\n ? dc_stream_release+0x25/0x90 [amdgpu]\n kasan_check_range+0x125/0x200\n dc_stream_release+0x25/0x90 [amdgpu]\n dc_state_destruct+0x14d/0x5c0 [amdgpu]\n dc_state_release.part.0+0x4e/0x130 [amdgpu]\n dm_atomic_destroy_state+0x3f/0x70 [amdgpu]\n drm_atomic_state_default_clear+0x8ee/0xf30\n ? drm_mode_object_put.part.0+0xb1/0x130\n __drm_atomic_state_free+0x15c/0x2d0\n atomic_remove_fb+0x67e/0x980\n\nSince there is no reliable way of figuring out whether a CRTC has unrelated\nmode changes pending at the time of DSC validation, remember the value of the\nmode_changed flag from before the point where a CRTC was marked as potentially\naffected by a change in DSC configuration. Reset the mode_changed flag to this\nearlier value instead in pre_validate_dsc().\n\n(cherry picked from commit cc7c7121ae082b7b82891baa7280f1ff2608f22b)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through local DRM/KMS ioctls, especially DRM_IOCTL_MODE_ATOMIC on an amdgpu primary device, not through network input.\nAC:L - On an affected AMD display setup with DSC/MST-capable outputs, the bad state transition is deterministically triggered by a crafted atomic modeset combining MST/DSC changes with an unrelated mode change.\nPR:L - The attacker must be a local DRM client with access to the primary node and current DRM master capability; this is attainable by an unprivileged graphical-session user and does not require real root.\nUI:N - Once the attacker has the local DRM access, exploitation is driven by ioctls and later framebuffer/CRTC teardown without requiring a separate victim action.\nS:U - The corruption occurs within the kernel display driver and affects the same kernel security authority, with no VM escape or cross-scope boundary involved.\nC:H - The bug creates a use-after-free of a kernel dc_stream_state object, and kernel UAF memory corruption is defensibly capable of exposing arbitrary kernel memory.\nI:H - The observed failure is a write through kref_put to a freed object, and a reclaimable kernel UAF write can be shaped into memory corruption or control-flow compromise.\nA:H - The commit documents a KASAN use-after-free in dc_stream_release, and this class of kernel memory corruption can reliably crash or destabilize the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:23:01.480Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/da1d0ed31e9802fd99384f43cc63678a5a11cb41"
        },
        {
          "url": "https://git.kernel.org/stable/c/21159d8b335a6b9f44cbb506733013a902ae2da4"
        },
        {
          "url": "https://git.kernel.org/stable/c/10862e344b4d6434642a48c87d765813fc0b0ba7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a5edc97fd9c6415ff2eff872748439a97e3c3d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/111208b5b7ebcdadb3f922cc52d8425f0fa91b33"
        },
        {
          "url": "https://git.kernel.org/stable/c/aed3d041ab061ec8a64f50a3edda0f4db7280025"
        }
      ],
      "title": "drm/amd/display: Do not skip unrelated mode changes in DSC validation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31488",
    "datePublished": "2026-04-22T13:54:12.963Z",
    "dateReserved": "2026-03-09T15:48:24.101Z",
    "dateUpdated": "2026-08-17T12:04:49.431Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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