{
  "cveId": "CVE-2026-99093",
  "url": "https://patchblox.com/security/cve/CVE-2026-99093",
  "summary": "CVE-2026-99093 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99093 (version 7.2.11-1), released October 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm: don\u0027t schedule deferred kernel page table fr...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm: don\u0027t schedule deferred kernel page table freeing while booting  Booting with a boot-time function tracer and a filter, for example    ftrace=function ftrace_filter=pud_free_pmd_page  panics on 7.3-rc4 as soon as the tracer starts:    [   23.531178] Starting tracer \u0027function\u0027   [   23.675800] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN NOPTI   [   23.819917] KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]   [   23.964025] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 7.3.0-rc4-fe2ec83746e5-with-fixes-v2\u002B #195 PREEMPT(undef)   [   24.252248] RIP: 0010:__queue_work\u002B0xab/0xf00   [   25.981629] Call Trace:   [   26.125727]  \u003CTASK\u003E   [   26.413912]  ? pagetable_free_kernel\u002B0x20/0x120   [   26.990283]  queue_work_on\u002B0x97/0xf0   [   27.134382]  __cpa_collapse_large_pages\u002B0x501/0x6f0   [   27.566662]  cpa_flush\u002B0x394/0x620   [   27.998953]  change_page_attr_set_clr\u002B0x321/0x4a0   [   29.151729]  set_memory_rox\u002B0xa2/0xf0   [   29.584018]  create_trampoline\u002B0x431/0x6f0   ...   [   44.343347] Kernel panic - not syncing: Attempted to kill the idle task!  The boot-time tracer is started from early_trace_init(), which runs before workqueue_init_early().  Making its trampoline read-only splits a large page, and CPA collapses it again right away.  The split table has been a kernel page table since commit 9e4a3ec3411b (\u0022x86/mm/pat: Allocate split page tables as kernel page tables\u0022), so the collapse frees it through pagetable_free_kernel(), which queues work on system_percpu_wq - still NULL at that point.  That commit is correct in itself; it only lets CPA reach pagetable_free_kernel() before the workqueue that function relies on exists.  Keep putting the table on the list, but don\u0027t schedule the work while the system is still booting.  A core_initcall schedules it once to free whatever was queued by then.",
  "published": "2026-10-26T15:16:48Z",
  "severity": "",
  "epss": 0.00162,
  "epssPercentile": 0.05412,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.11-1",
      "fix": "DEBIAN-CVE-2026-99093",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99093",
      "released": "2026-10-27T21:14:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}