{
  "cveId": "CVE-2026-98866",
  "url": "https://patchblox.com/security/cve/CVE-2026-98866",
  "summary": "CVE-2026-98866 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98866 (version 7.2.10-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched/cache: Introduce task_struct-\u003Esched_cache_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched/cache: Introduce task_struct-\u003Esched_cache_grp to fix UAF  Add a sched_cache_grp pointer to task_struct so that scheduler code can access the cache group directly via the task, without going through mm-\u003Esched_cache_grp.  This decouples the scheduler\u0027s hot-path accesses from the mm_struct.  Each task holds its own refcount on the sched_cache_group, separate from the reference held by its mm_struct.  The reference is acquired in copy_mm() (fork) and exec_mmap() (exec), and released in exit_mm(). This fixes the use-after-free when account_mm_sched() reaches the group through a task whose mm is being switched, as reported by Hyunwoo:    https://lore.kernel.org/lkml/apPb-Dr4nPYuHQOK@v4bel/  Convert all scheduler code in fair.c and exit.c to use p-\u003Esched_cache_grp instead of p-\u003Emm-\u003Esched_cache_grp.  Keep the fork/exec/exit reference management out of the generic mm paths: add sched_cache_fork(), sched_cache_fork_cleanup(), sched_cache_exec_mmap() and sched_cache_exit_mm() in kernel/sched/cache_sched.c (with empty stubs for !CONFIG_SCHED_CACHE), so fs/exec.c, kernel/fork.c and kernel/exit.c each call one helper instead of open-coding the refcounting under #ifdef.  Also add sched_cache_group_get() and task_cache_group_get().",
  "published": "2026-10-18T16:17:41Z",
  "severity": "",
  "epss": 0.00145,
  "epssPercentile": 0.03804,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.10-1",
      "fix": "DEBIAN-CVE-2026-98866",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98866",
      "released": "2026-10-19T16:27:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}