{
  "cveId": "CVE-2026-97937",
  "url": "https://patchblox.com/security/cve/CVE-2026-97937",
  "summary": "CVE-2026-97937 is fixed in linux on 1 platform by DEBIAN-CVE-2026-97937 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ftrace: fork: Initialize function graph state be...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ftrace: fork: Initialize function graph state before copy_exec_state()  dup_task_struct() copies the parent\u0027s task_struct, including ret_stack. ftrace_graph_init_task() clears the copied function graph state, but it currently runs after copy_exec_state().  For non-CLONE_VM forks, copy_exec_state() allocates a new task_exec_state. If that allocation fails, copy_process() reaches bad_fork_free and free_task() calls ftrace_graph_exit_task(). Since the child still carries the parent\u0027s ret_stack pointer, the unwind frees the parent\u0027s active function graph return stack. The parent subsequently accesses freed memory from function_graph_enter_regs().  KASAN reports:  [   22.190920] ================================================================== [   22.195899] BUG: KASAN: slab-use-after-free in function_graph_enter_regs\u002B0xa76/0xb90 [   22.200747] Write of size 8 at addr ff110000054dc0a8 by task repro/1 [   22.205134] [   22.210770] CPU: 0 UID: 0 PID: 1 Comm: repro Not tainted 7.2.0-07732-g9328b3b03bdc-dirty #3 PREEMPT(lazy) [   22.212576] Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   22.213750] Call Trace: [   22.215271]  \u003CTASK\u003E [   22.216242]  ? ftrace_stub_direct_tramp\u002B0x10/0x10 [   22.217774]  dump_stack_lvl\u002B0x4e/0x70 [   22.220531]  print_report\u002B0x157/0x4b4 [   22.223202]  ? fixup_red_left\u002B0x9/0x30 [   22.224407]  ? complete_report_info\u002B0x83/0x110 [   22.226679]  ? function_graph_enter_regs\u002B0xa76/0xb90 [   22.228084]  kasan_report\u002B0xce/0x100 [   22.230109]  ? function_graph_enter_regs\u002B0xa76/0xb90 [   22.232860]  ? stack_trace_save\u002B0x4/0xd0 [   22.234156]  function_graph_enter_regs\u002B0xa76/0xb90 [   22.236090]  ? kasan_save_stack\u002B0x30/0x50 [   22.237752]  ? __pfx_function_graph_enter_regs\u002B0x10/0x10 [   22.238694]  ? ring_buffer_lock_reserve\u002B0x345/0xf80 [   22.239628]  ? stack_trace_save\u002B0x4/0xd0 [   22.242121]  ? stack_trace_save\u002B0x4/0xd0 [   22.243588]  ftrace_graph_func\u002B0xda/0x160 [   22.245362]  ? ftrace_stub_direct_tramp\u002B0x10/0x10 [   22.246520]  0xffffffffa0000095 [   22.250528]  ? stack_trace_save\u002B0x9/0xd0 [   22.251757]  ? ring_buffer_unlock_commit\u002B0x11d/0x5c0 [   22.253152]  stack_trace_save\u002B0x9/0xd0 [   22.254264]  kasan_save_stack\u002B0x30/0x50 [   22.273631]  kasan_save_track\u002B0x14/0x30 [   22.276763]  kasan_save_free_info\u002B0x3b/0x70 [   22.278296]  __kasan_slab_free\u002B0x43/0x70 [   22.280157]  kmem_cache_free\u002B0xbf/0x3b0 [   22.282963]  ? ftrace_stub_direct_tramp\u002B0x10/0x10 [   22.284001]  free_task\u002B0xa2/0x160 [   22.285699]  ? ftrace_stub_direct_tramp\u002B0x10/0x10 [   22.286752]  copy_process\u002B0x2aae/0x7bc0  Initialize the child function graph state immediately after dup_task_struct(), before the first fallible operation.",
  "published": "2026-09-25T11:17:21Z",
  "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": 0.00154,
  "epssPercentile": 0.04535,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-97937",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97937",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}