CVE-2026-98512 (GCVE-0-2026-98512)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:17 – Updated: 2026-10-24 14:09
VLAI
Title
drm/nouveau: RCU-free the scheduler-containing nouveau_sched
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: RCU-free the scheduler-containing nouveau_sched struct nouveau_sched embeds a struct drm_gpu_scheduler (base). nouveau_sched_destroy() calls nouveau_sched_fini() (which does drm_sched_fini(&sched->base)) and then frees the object with plain kfree(sched). drm_sched_fence_get_timeline_name() returns fence->sched->name, and the scheduler fence keeps a .release callback so it is not ops-detached on signalling. A finished fence exported to userspace via drm_syncobj / sync_file therefore keeps pointing at &sched->base after nouveau_sched_destroy(), and a later get_timeline_name() -- reachable unprivileged through SYNC_IOC_FILE_INFO -- dereferences freed memory (KASAN slab-use-after-free read). Per the dma-fence lifetime contract the exporter must keep the data backing a signalled fence alive for an RCU grace period. Free the scheduler-containing object with kfree_rcu() instead of kfree().
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6794 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < 40edf5eefc3fd94592a91d6eb074d4fc6f606c75 (git)
Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < 35151e9a8274174ccbb92e3b3ba7dc7a008dcada (git)
Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < cd6e11b6ebe04a0a1f1435df561acada9eadc563 (git)
Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < f7eae6d8d768fabd6b59779ca7da79e02c74e113 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_sched.c",
            "drivers/gpu/drm/nouveau/nouveau_sched.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "40edf5eefc3fd94592a91d6eb074d4fc6f606c75",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            },
            {
              "lessThan": "35151e9a8274174ccbb92e3b3ba7dc7a008dcada",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            },
            {
              "lessThan": "cd6e11b6ebe04a0a1f1435df561acada9eadc563",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            },
            {
              "lessThan": "f7eae6d8d768fabd6b59779ca7da79e02c74e113",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_sched.c",
            "drivers/gpu/drm/nouveau/nouveau_sched.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: RCU-free the scheduler-containing nouveau_sched\n\nstruct nouveau_sched embeds a struct drm_gpu_scheduler (base).\nnouveau_sched_destroy() calls nouveau_sched_fini() (which does\ndrm_sched_fini(\u0026sched-\u003ebase)) and then frees the object with plain\nkfree(sched).\n\ndrm_sched_fence_get_timeline_name() returns fence-\u003esched-\u003ename, and the\nscheduler fence keeps a .release callback so it is not ops-detached on\nsignalling.  A finished fence exported to userspace via drm_syncobj /\nsync_file therefore keeps pointing at \u0026sched-\u003ebase after nouveau_sched_destroy(),\nand a later get_timeline_name() -- reachable unprivileged through\nSYNC_IOC_FILE_INFO -- dereferences freed memory (KASAN slab-use-after-free\nread).\n\nPer the dma-fence lifetime contract the exporter must keep the data backing a\nsignalled fence alive for an RCU grace period.  Free the scheduler-containing\nobject with kfree_rcu() instead of kfree()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - A local process reaches the patched nouveau_sched_destroy() through DRM-fd close or DRM_IOCTL_NOUVEAU_CHANNEL_FREE, then triggers the dangling scheduler access through SYNC_IOC_FILE_INFO \u2192 sync_fill_fence_info() \u2192 drm_sched_fence_get_timeline_name(); no network path exists.\nAC:L - The attacker controls fence creation, export, scheduler teardown, and querying; affected branches permit a post-teardown query, and where concurrent timing is needed the attacker can gate its job on a syncobj and repeatedly race its completion and close against SYNC_IOC_FILE_INFO.\nPR:L - NOUVEAU_VM_INIT, VM_BIND, EXEC, CHANNEL_FREE, and the core syncobj ioctls are DRM_RENDER_ALLOW, while drm_ioctl_permit() imposes no DRM_MASTER, DRM_ROOT_ONLY, or capability check; ordinary render-node access suffices.\nUI:N - The attacker independently creates and exports the scheduler fence, closes the channel or DRM file to invoke nouveau_sched_destroy(), and queries the retained sync-file without any victim action.\nS:U - The freed nouveau_sched and the resulting disclosure or crash are within the same host-kernel security authority; the path does not cross a VM, IOMMU, or hypervisor boundary.\nC:H - drm_sched_fence_get_timeline_name() treats reclaimed nouveau_sched bytes as the name pointer; after heap reuse, sync_fill_fence_info() copies up to 31 bytes from that attacker-influenced address into user-visible obj_name, and repeated objects support arbitrary kernel-memory disclosure.\nI:N - The stale value is used only as the source pointer for strscpy() into a correctly sized, newly allocated sync_fence_info buffer; this path never writes through fence-\u003esched or the attacker-influenced pointer, so it provides no demonstrated modification primitive.\nA:H - If reclaimed sched-\u003ename contains an invalid address, strscpy() in sync_fill_fence_info() can cause a kernel page fault and oops or panic; KASAN directly detects the slab use-after-free, and the local sequence is repeatable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:12.662Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/40edf5eefc3fd94592a91d6eb074d4fc6f606c75"
        },
        {
          "url": "https://git.kernel.org/stable/c/35151e9a8274174ccbb92e3b3ba7dc7a008dcada"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd6e11b6ebe04a0a1f1435df561acada9eadc563"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7eae6d8d768fabd6b59779ca7da79e02c74e113"
        }
      ],
      "title": "drm/nouveau: RCU-free the scheduler-containing nouveau_sched",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98512",
    "datePublished": "2026-10-18T15:17:27.102Z",
    "dateReserved": "2026-09-25T10:25:14.354Z",
    "dateUpdated": "2026-10-24T14:09:12.662Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98512",
      "date": "2026-11-02",
      "epss": "0.00159",
      "percentile": "0.05051"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:37:10.000Z",
      "cve": "CVE-2026-98512",
      "id": "msrc_CVE-2026-98512",
      "initial_release_date": "2026-10-20T22:24:19.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/nouveau: RCU-free the scheduler-containing nouveau_sched",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98512.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/nouveau/nouveau_sched.c",
                  "drivers/gpu/drm/nouveau/nouveau_sched.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "40edf5eefc3fd94592a91d6eb074d4fc6f606c75",
                    "status": "affected",
                    "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "35151e9a8274174ccbb92e3b3ba7dc7a008dcada",
                    "status": "affected",
                    "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "cd6e11b6ebe04a0a1f1435df561acada9eadc563",
                    "status": "affected",
                    "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f7eae6d8d768fabd6b59779ca7da79e02c74e113",
                    "status": "affected",
                    "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/nouveau/nouveau_sched.c",
                  "drivers/gpu/drm/nouveau/nouveau_sched.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.8"
                  },
                  {
                    "lessThan": "6.8",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.55",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.9",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: RCU-free the scheduler-containing nouveau_sched\n\nstruct nouveau_sched embeds a struct drm_gpu_scheduler (base).\nnouveau_sched_destroy() calls nouveau_sched_fini() (which does\ndrm_sched_fini(\u0026sched-\u003ebase)) and then frees the object with plain\nkfree(sched).\n\ndrm_sched_fence_get_timeline_name() returns fence-\u003esched-\u003ename, and the\nscheduler fence keeps a .release callback so it is not ops-detached on\nsignalling.  A finished fence exported to userspace via drm_syncobj /\nsync_file therefore keeps pointing at \u0026sched-\u003ebase after nouveau_sched_destroy(),\nand a later get_timeline_name() -- reachable unprivileged through\nSYNC_IOC_FILE_INFO -- dereferences freed memory (KASAN slab-use-after-free\nread).\n\nPer the dma-fence lifetime contract the exporter must keep the data backing a\nsignalled fence alive for an RCU grace period.  Free the scheduler-containing\nobject with kfree_rcu() instead of kfree()."
          }
        ],
        "id": "CVE-2026-98512",
        "lastModified": "2026-10-24T14:16:45.290",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-18T16:17:02.457",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/35151e9a8274174ccbb92e3b3ba7dc7a008dcada"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/40edf5eefc3fd94592a91d6eb074d4fc6f606c75"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cd6e11b6ebe04a0a1f1435df561acada9eadc563"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f7eae6d8d768fabd6b59779ca7da79e02c74e113"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:01:52+00:00",
      "cve": "CVE-2026-98512",
      "id": "CVE-2026-98512",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "186",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/nouveau: RCU-free the scheduler-containing nouveau_sched",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98512.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.