{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1fadebbbf31f65beba353fa9d1373bf183e03fed",
              "status": "affected",
              "version": "6b1c66c9cca99bf00386481c7b2aa7394c26d8b8",
              "versionType": "git"
            },
            {
              "lessThan": "08cacffeef8f64f1a222c93467ca84f24a46c953",
              "status": "affected",
              "version": "6b1c66c9cca99bf00386481c7b2aa7394c26d8b8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "lessThan": "7.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: fork: Initialize function graph state before copy_exec_state()\n\ndup_task_struct() copies the parent\u0027s task_struct, including ret_stack.\nftrace_graph_init_task() clears the copied function graph state, but it\ncurrently runs after copy_exec_state().\n\nFor non-CLONE_VM forks, copy_exec_state() allocates a new task_exec_state.\nIf that allocation fails, copy_process() reaches bad_fork_free and\nfree_task() calls ftrace_graph_exit_task(). Since the child still carries\nthe parent\u0027s ret_stack pointer, the unwind frees the parent\u0027s active\nfunction graph return stack. The parent subsequently accesses freed memory\nfrom function_graph_enter_regs().\n\nKASAN reports:\n\n[   22.190920] ==================================================================\n[   22.195899] BUG: KASAN: slab-use-after-free in function_graph_enter_regs+0xa76/0xb90\n[   22.200747] Write of size 8 at addr ff110000054dc0a8 by task repro/1\n[   22.205134]\n[   22.210770] CPU: 0 UID: 0 PID: 1 Comm: repro Not tainted 7.2.0-07732-g9328b3b03bdc-dirty #3 PREEMPT(lazy)\n[   22.212576] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   22.213750] Call Trace:\n[   22.215271]  \u003cTASK\u003e\n[   22.216242]  ? ftrace_stub_direct_tramp+0x10/0x10\n[   22.217774]  dump_stack_lvl+0x4e/0x70\n[   22.220531]  print_report+0x157/0x4b4\n[   22.223202]  ? fixup_red_left+0x9/0x30\n[   22.224407]  ? complete_report_info+0x83/0x110\n[   22.226679]  ? function_graph_enter_regs+0xa76/0xb90\n[   22.228084]  kasan_report+0xce/0x100\n[   22.230109]  ? function_graph_enter_regs+0xa76/0xb90\n[   22.232860]  ? stack_trace_save+0x4/0xd0\n[   22.234156]  function_graph_enter_regs+0xa76/0xb90\n[   22.236090]  ? kasan_save_stack+0x30/0x50\n[   22.237752]  ? __pfx_function_graph_enter_regs+0x10/0x10\n[   22.238694]  ? ring_buffer_lock_reserve+0x345/0xf80\n[   22.239628]  ? stack_trace_save+0x4/0xd0\n[   22.242121]  ? stack_trace_save+0x4/0xd0\n[   22.243588]  ftrace_graph_func+0xda/0x160\n[   22.245362]  ? ftrace_stub_direct_tramp+0x10/0x10\n[   22.246520]  0xffffffffa0000095\n[   22.250528]  ? stack_trace_save+0x9/0xd0\n[   22.251757]  ? ring_buffer_unlock_commit+0x11d/0x5c0\n[   22.253152]  stack_trace_save+0x9/0xd0\n[   22.254264]  kasan_save_stack+0x30/0x50\n[   22.273631]  kasan_save_track+0x14/0x30\n[   22.276763]  kasan_save_free_info+0x3b/0x70\n[   22.278296]  __kasan_slab_free+0x43/0x70\n[   22.280157]  kmem_cache_free+0xbf/0x3b0\n[   22.282963]  ? ftrace_stub_direct_tramp+0x10/0x10\n[   22.284001]  free_task+0xa2/0x160\n[   22.285699]  ? ftrace_stub_direct_tramp+0x10/0x10\n[   22.286752]  copy_process+0x2aae/0x7bc0\n\nInitialize the child function graph state immediately after\ndup_task_struct(), before the first fallible operation."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Triggered by a local fork()/clone() without CLONE_VM entering copy_process(): copy_exec_state() -\u003e task_exec_state_copy() fails, and bad_fork_free -\u003e free_task() -\u003e ftrace_graph_exit_task() frees the ret_stack pointer the child inherited from the parent. No remote input is involved.\nAC:L - placeholder\nPR:L - placeholder\nUI:N - placeholder\nS:U - placeholder\nC:H - placeholder\nI:H - placeholder\nA:H - placeholder"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:11:03.903Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1fadebbbf31f65beba353fa9d1373bf183e03fed"
        },
        {
          "url": "https://git.kernel.org/stable/c/08cacffeef8f64f1a222c93467ca84f24a46c953"
        }
      ],
      "title": "ftrace: fork: Initialize function graph state before copy_exec_state()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97937",
    "datePublished": "2026-09-25T10:22:51.075Z",
    "dateReserved": "2026-09-25T10:18:58.204Z",
    "dateUpdated": "2026-10-19T09:11:03.903Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}