{
  "cveId": "CVE-2026-98385",
  "url": "https://patchblox.com/security/cve/CVE-2026-98385",
  "summary": "CVE-2026-98385 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98385 (version 7.2.9-1), released October 12, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched/cache: Decouple sched_cache_group from mm...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched/cache: Decouple sched_cache_group from mm to fix UAF  Currently the sched cache grouping is by mm and the scheduling statistics sched_cache_stat lives in the mm structure.  This ties the life cycle of scheduling stats with mm.  In account_mm_sched(), the scheduling stats are accessed by task-\u003Emm-\u003Esc_stat.  However, a task may be switching mm on one CPU when another CPU is running account_mm_sched(), and possibly accessing the old mm that was freed.  This problem was found when running tests with KASAN by Hyunwoo:    https://lore.kernel.org/lkml/apPb-Dr4nPYuHQOK@v4bel/  Instead of serializing the mm access by introducing extra acquisition of rq lock in the mm free path, extract sched_cache_stat from mm_struct, rename it as sched_cache_group and manage its life cycle apart from mm_struct with its own ref counting.  This allows us in the next patch access sched_cache_group directly from task, and add a refcount on sched_cache_group when a task links to it. This prevents the use after free issue when accessing stale and released old mm and its sched cache stat a task switches to a new mm while account_mm_sched() is done elsewhere.  The other benefit of this restructure is in the future, the grouping of tasks to a LLC would have the flexibility to be associated with a user defined grouping, or cgroup, cookie group, numa_group or others instead of just with a single mm address space.  Rename sched_cache_stat to sched_cache_group and turn it into a refcounted object allocated from mm_struct.  The mm_struct now holds a pointer (sched_cache_grp) to this object instead of embedding it.",
  "published": "2026-10-12T06:17:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00177,
  "epssPercentile": 0.07309,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98385",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98385",
      "released": "2026-10-12T23:16:46Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}