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

Vulnerability from cvelistv5 – Published: 2026-10-18 15:17 – Updated: 2026-10-19 09:20
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
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 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.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_sched.c",
            "drivers/gpu/drm/nouveau/nouveau_sched.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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      "cpeApplicability": [
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              "operator": "OR"
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      "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:20:52.234Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/40edf5eefc3fd94592a91d6eb074d4fc6f606c75"
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          "url": "https://git.kernel.org/stable/c/35151e9a8274174ccbb92e3b3ba7dc7a008dcada"
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        },
        {
          "url": "https://git.kernel.org/stable/c/f7eae6d8d768fabd6b59779ca7da79e02c74e113"
        }
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      "title": "drm/nouveau: RCU-free the scheduler-containing nouveau_sched",
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  "cveMetadata": {
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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": "2026-10-19T09:20:52.234Z",
    "state": "PUBLISHED"
  },
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      "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",
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      "version": "2"
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        "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": "2026-10-19T10:19:04.787",
        "metrics": {},
        "published": "2026-10-18T16:17:02.457",
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      "cve": "CVE-2026-98512",
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      "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"
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      "id": "CVE-2026-98512",
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      "product_status:known_affected": "0",
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      "source": "SUSE CSAF VEX",
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    }
  }
}



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