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CVE-2022-50393 (GCVE-0-2022-50393)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-15 12:23
VLAI
Title
drm/amdgpu: SDMA update use unlocked iterator
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: SDMA update use unlocked iterator SDMA update page table may be called from unlocked context, this generate below warning. Use unlocked iterator to handle this case. WARNING: CPU: 0 PID: 1475 at drivers/dma-buf/dma-resv.c:483 dma_resv_iter_next Call Trace: dma_resv_iter_first+0x43/0xa0 amdgpu_vm_sdma_update+0x69/0x2d0 [amdgpu] amdgpu_vm_ptes_update+0x29c/0x870 [amdgpu] amdgpu_vm_update_range+0x2f6/0x6c0 [amdgpu] svm_range_unmap_from_gpus+0x115/0x300 [amdgpu] svm_range_cpu_invalidate_pagetables+0x510/0x5e0 [amdgpu] __mmu_notifier_invalidate_range_start+0x1d3/0x230 unmap_vmas+0x140/0x150 unmap_region+0xa8/0x110
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:51 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8bb31587820a6e04cb613b49238b1800d1a97223 , < b892c57a3a04c8de247ab9ee08a0a8cf53290e19 (git)
Affected: 8bb31587820a6e04cb613b49238b1800d1a97223 , < 4ff3d517cebe8a29b9f3c302b5292bb1ce291e00 (git)
Affected: 8bb31587820a6e04cb613b49238b1800d1a97223 , < 3913f0179ba366f7d7d160c506ce00de1602bbc4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "description": "CWE-noinfo Not enough information",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T18:50:59.514Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "b892c57a3a04c8de247ab9ee08a0a8cf53290e19",
                  "status": "affected",
                  "version": "8bb31587820a6e04cb613b49238b1800d1a97223",
                  "versionType": "git"
                },
                {
                  "lessThan": "4ff3d517cebe8a29b9f3c302b5292bb1ce291e00",
                  "status": "affected",
                  "version": "8bb31587820a6e04cb613b49238b1800d1a97223",
                  "versionType": "git"
                },
                {
                  "lessThan": "3913f0179ba366f7d7d160c506ce00de1602bbc4",
                  "status": "affected",
                  "version": "8bb31587820a6e04cb613b49238b1800d1a97223",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.19"
                },
                {
                  "lessThan": "5.19",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.19.*",
                  "status": "unaffected",
                  "version": "5.19.17",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.0.*",
                  "status": "unaffected",
                  "version": "6.0.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.19.17",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.0.3",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: SDMA update use unlocked iterator\n\nSDMA update page table may be called from unlocked context, this\ngenerate below warning. Use unlocked iterator to handle this case.\n\nWARNING: CPU: 0 PID: 1475 at\ndrivers/dma-buf/dma-resv.c:483 dma_resv_iter_next\nCall Trace:\n dma_resv_iter_first+0x43/0xa0\n amdgpu_vm_sdma_update+0x69/0x2d0 [amdgpu]\n amdgpu_vm_ptes_update+0x29c/0x870 [amdgpu]\n amdgpu_vm_update_range+0x2f6/0x6c0 [amdgpu]\n svm_range_unmap_from_gpus+0x115/0x300 [amdgpu]\n svm_range_cpu_invalidate_pagetables+0x510/0x5e0 [amdgpu]\n __mmu_notifier_invalidate_range_start+0x1d3/0x230\n unmap_vmas+0x140/0x150\n unmap_region+0xa8/0x110"
            }
          ],
          "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 - Reachable only via local KFD SVM: open /dev/kfd, set up an SVM range, then munmap triggers svm_range_cpu_invalidate_pagetables \u2192 svm_range_unmap_from_gpus \u2192 amdgpu_vm_update_range(unlocked=true) \u2192 amdgpu_vm_sdma_update; no network or adjacent-link path.\nAC:L - The attacker controls both sides\u2014munmap to hit the unlocked MMU-notifier path while concurrently driving GPU/SVM updates that lock and rewrite the same PD/PT dma_resv fence list\u2014so the race does not depend on conditions outside their influence.\nPR:L - /dev/kfd and DRM render nodes are group-accessible to unprivileged users in the render/video group (typically 0660 root:render) with no capability gate, so init-ns root is not required.\nUI:N - The attacker opens KFD, configures SVM mappings, and unmaps/races GPU updates entirely themselves; no separate victim action is required.\nS:U - Impact stays within the local host kernel privilege boundary as a standard kernel memory-safety/privilege-escalation issue, not a VM, IOMMU, or sandbox escape.\nC:H - The locked iterator walks dma_resv fences without rcu_read_lock or dma_fence_get_rcu while writers may kfree_rcu the list and drop fence refs, yielding a UAF of dma_resv_list/dma_fence usable for arbitrary kernel reads.\nI:H - The same unlocked locked-iteration UAF lets the attacker reclaim freed fence/list objects and build write or control-flow hijacking primitives beyond a pure crash.\nA:H - The path reliably hits dma_resv_assert_held WARN/oops under lockdep, and the concurrent UAF can crash the kernel even without full exploitation, so availability impact is high."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-15T12:23:26.499Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b892c57a3a04c8de247ab9ee08a0a8cf53290e19"
            },
            {
              "url": "https://git.kernel.org/stable/c/4ff3d517cebe8a29b9f3c302b5292bb1ce291e00"
            },
            {
              "url": "https://git.kernel.org/stable/c/3913f0179ba366f7d7d160c506ce00de1602bbc4"
            }
          ],
          "title": "drm/amdgpu: SDMA update use unlocked iterator",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-50393",
        "datePublished": "2025-09-18T13:33:12.247Z",
        "dateReserved": "2025-09-17T14:53:06.998Z",
        "dateUpdated": "2026-08-15T12:23:26.499Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.