Vulnerability-Lookup

GHSA-2689-7JHQ-FVHW

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-24 15:32

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98512"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:02Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-2689-7jhq-fvhw",
  "modified": "2026-10-24T15:32:47Z",
  "published": "2026-10-18T18:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35151e9a8274174ccbb92e3b3ba7dc7a008dcada"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40edf5eefc3fd94592a91d6eb074d4fc6f606c75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd6e11b6ebe04a0a1f1435df561acada9eadc563"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7eae6d8d768fabd6b59779ca7da79e02c74e113"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-10-18 15:17 – Updated: 2026-10-24 14:09

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 6820 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/40edf5eefc3fd9459…
https://git.kernel.org/stable/c/35151e9a8274174cc…
https://git.kernel.org/stable/c/cd6e11b6ebe04a0a1…
https://git.kernel.org/stable/c/f7eae6d8d768fabd6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < 40edf5eefc3fd94592a91d6eb074d4fc6f606c75 (git) Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < 35151e9a8274174ccbb92e3b3ba7dc7a008dcada (git) Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < cd6e11b6ebe04a0a1f1435df561acada9eadc563 (git) Affected: 5f03a507b29e44a848f315c7240c19894dd8be4f , < f7eae6d8d768fabd6b59779ca7da79e02c74e113 (git)
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)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_sched.c",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "40edf5eefc3fd94592a91d6eb074d4fc6f606c75",
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              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            },
            {
              "lessThan": "35151e9a8274174ccbb92e3b3ba7dc7a008dcada",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
              "versionType": "git"
            },
            {
              "lessThan": "cd6e11b6ebe04a0a1f1435df561acada9eadc563",
              "status": "affected",
              "version": "5f03a507b29e44a848f315c7240c19894dd8be4f",
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            },
            {
              "lessThan": "f7eae6d8d768fabd6b59779ca7da79e02c74e113",
              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
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          "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",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "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": [
        {
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            "baseSeverity": "HIGH",
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              "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."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:12.662Z",
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        "shortName": "Linux"
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        },
        {
          "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",
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    "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"
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  "dataType": "CVE_RECORD",
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}

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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