CVE-2026-45878 (GCVE-0-2026-45878)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:16 – Updated: 2026-10-19 19:26
VLAI
Title
drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 The address watch clear code receives watch_id as an unsigned value (u32), but some helper functions were using a signed int and checked bits by shifting with watch_id. If a very large watch_id is passed from userspace, it can be converted to a negative value. This can cause invalid shifts and may access memory outside the watch_points array. drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 Fix this by checking that watch_id is within MAX_WATCH_ADDRESSES before using it. Also use BIT(watch_id) to test and clear bits safely. This keeps the behavior unchanged for valid watch IDs and avoids undefined behavior for invalid ones. Fixes the below: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448 kfd_dbg_trap_clear_dev_address_watch() error: buffer overflow 'pdd->watch_points' 4 <= u32max user_rl='0-3,2147483648-u32max' uncapped drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c 433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd, 434 uint32_t watch_id) 435 { 436 int r; 437 438 if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id)) kfd_dbg_owns_dev_watch_id() doesn't check for negative values so if watch_id is larger than INT_MAX it leads to a buffer overflow. (Negative shifts are undefined). 439 return -EINVAL; 440 441 if (!pdd->dev->kfd->shared_resources.enable_mes) { 442 r = debug_lock_and_unmap(pdd->dev->dqm); 443 if (r) 444 return r; 445 } 446 447 amdgpu_gfx_off_ctrl(pdd->dev->adev, false); --> 448 pdd->watch_points[watch_id] = pdd->dev->kfd2kgd->clear_address_watch( 449 pdd->dev->adev, 450 watch_id); v2: (as per, Jonathan Kim) - Add early watch_id >= MAX_WATCH_ADDRESSES validation in the set path to match the clear path. - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:18 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e0f85f4690d089cc1a60337decafb1acf7eec45e , < 971bf8e61e9b4abaacf9b35eaf76ec222758f9d6 (git)
Affected: e0f85f4690d089cc1a60337decafb1acf7eec45e , < a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488 (git)
Affected: e0f85f4690d089cc1a60337decafb1acf7eec45e , < 2b36c0c1bcbbe15f6cfa9652084b3124c835a150 (git)
Affected: e0f85f4690d089cc1a60337decafb1acf7eec45e , < 3c38a0f07aa2bfef2b219b1f045534ad93f85afd (git)
Affected: e0f85f4690d089cc1a60337decafb1acf7eec45e , < 5a19302cab5cec7ae7f1a60c619951e6c17d8742 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:18:15.974841Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-05-27T14:17:01.547",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2b36c0c1bcbbe15f6cfa9652084b3124c835a150"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3c38a0f07aa2bfef2b219b1f045534ad93f85afd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5a19302cab5cec7ae7f1a60c619951e6c17d8742"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/971bf8e61e9b4abaacf9b35eaf76ec222758f9d6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T10:44:13+00:00",
      "cve": "CVE-2026-45878",
      "id": "CVE-2026-45878",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_not_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45878.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-45878",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:18:15.974841Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-125",
                    "description": "CWE-125 Out-of-bounds Read",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:18:16.562Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdkfd/kfd_debug.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "971bf8e61e9b4abaacf9b35eaf76ec222758f9d6",
                  "status": "affected",
                  "version": "e0f85f4690d089cc1a60337decafb1acf7eec45e",
                  "versionType": "git"
                },
                {
                  "lessThan": "a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488",
                  "status": "affected",
                  "version": "e0f85f4690d089cc1a60337decafb1acf7eec45e",
                  "versionType": "git"
                },
                {
                  "lessThan": "2b36c0c1bcbbe15f6cfa9652084b3124c835a150",
                  "status": "affected",
                  "version": "e0f85f4690d089cc1a60337decafb1acf7eec45e",
                  "versionType": "git"
                },
                {
                  "lessThan": "3c38a0f07aa2bfef2b219b1f045534ad93f85afd",
                  "status": "affected",
                  "version": "e0f85f4690d089cc1a60337decafb1acf7eec45e",
                  "versionType": "git"
                },
                {
                  "lessThan": "5a19302cab5cec7ae7f1a60c619951e6c17d8742",
                  "status": "affected",
                  "version": "e0f85f4690d089cc1a60337decafb1acf7eec45e",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdkfd/kfd_debug.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.5"
                },
                {
                  "lessThan": "6.5",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.128",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.75",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.14",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.19.*",
                  "status": "unaffected",
                  "version": "6.19.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.128",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.75",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.14",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19.4",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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              ]
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix watch_id bounds checking in debug address watch v2\n\nThe address watch clear code receives watch_id as an unsigned value\n(u32), but some helper functions were using a signed int and checked\nbits by shifting with watch_id.\n\nIf a very large watch_id is passed from userspace, it can be converted\nto a negative value.  This can cause invalid shifts and may access\nmemory outside the watch_points array.\n\ndrm/amdkfd: Fix watch_id bounds checking in debug address watch v2\n\nFix this by checking that watch_id is within MAX_WATCH_ADDRESSES before\nusing it.  Also use BIT(watch_id) to test and clear bits safely.\n\nThis keeps the behavior unchanged for valid watch IDs and avoids\nundefined behavior for invalid ones.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448\nkfd_dbg_trap_clear_dev_address_watch() error: buffer overflow\n\u0027pdd-\u003ewatch_points\u0027 4 \u003c= u32max user_rl=\u00270-3,2147483648-u32max\u0027 uncapped\n\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c\n    433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd,\n    434                                         uint32_t watch_id)\n    435 {\n    436         int r;\n    437\n    438         if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id))\n\nkfd_dbg_owns_dev_watch_id() doesn\u0027t check for negative values so if\nwatch_id is larger than INT_MAX it leads to a buffer overflow.\n(Negative shifts are undefined).\n\n    439                 return -EINVAL;\n    440\n    441         if (!pdd-\u003edev-\u003ekfd-\u003eshared_resources.enable_mes) {\n    442                 r = debug_lock_and_unmap(pdd-\u003edev-\u003edqm);\n    443                 if (r)\n    444                         return r;\n    445         }\n    446\n    447         amdgpu_gfx_off_ctrl(pdd-\u003edev-\u003eadev, false);\n--\u003e 448         pdd-\u003ewatch_points[watch_id] = pdd-\u003edev-\u003ekfd2kgd-\u003eclear_address_watch(\n    449                                                         pdd-\u003edev-\u003eadev,\n    450                                                         watch_id);\n\nv2: (as per, Jonathan Kim)\n - Add early watch_id \u003e= MAX_WATCH_ADDRESSES validation in the set path to\n   match the clear path.\n - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id()."
            }
          ],
          "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 vulnerability is reached only through an ioctl (AMDKFD_IOC_DBG_TRAP) on the local /dev/kfd device node; there is no network or remote path.\nAC:L - The attacker fully controls both the allocation of a watch point and the crafted watch_id; the negative-shift behavior is deterministic on x86, so the out-of-bounds write is triggered reliably and repeatably.\nPR:L - The ioctl has flags=0 with no capability check, and self-debugging (target==p) is permitted, so any unprivileged local user with access to the GPU device node (/dev/kfd) can reach the bug; no root/CAP_SYS_ADMIN is required.\nUI:N - The attacking process performs the enable/allocate/clear sequence entirely on its own; no action by another user is needed.\nS:U - The out-of-bounds write corrupts kernel memory within the same kernel security authority; it does not cross into a separate authority such as a hypervisor or IOMMU boundary.\nC:H - The bug is a kernel out-of-bounds write (memory corruption) that can be groomed to overwrite adjacent kernel structures (e.g., size/pointer fields), which can be leveraged to enable information disclosure.\nI:H - Attacker-influenced out-of-bounds write of a 32-bit value into kernel memory at a controllable offset is a direct kernel memory-corruption/write primitive.\nA:H - The out-of-bounds write into unmapped or critical kernel memory readily causes a kernel oops/panic, producing a denial of service."
                }
              ]
            }
          ],
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            "dateUpdated": "2026-08-05T12:28:38.911Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/971bf8e61e9b4abaacf9b35eaf76ec222758f9d6"
            },
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            },
            {
              "url": "https://git.kernel.org/stable/c/3c38a0f07aa2bfef2b219b1f045534ad93f85afd"
            },
            {
              "url": "https://git.kernel.org/stable/c/5a19302cab5cec7ae7f1a60c619951e6c17d8742"
            }
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          "title": "drm/amdkfd: Fix watch_id bounds checking in debug address watch v2",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-45878",
        "datePublished": "2026-05-27T12:16:49.108Z",
        "dateReserved": "2026-05-13T15:03:33.081Z",
        "dateUpdated": "2026-10-19T19:26:39.200Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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