{
  "threat_severity" : "Moderate",
  "public_date" : "2025-09-15T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: drm/tests: helpers: Avoid a driver uaf",
    "id" : "2395384",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2395384"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.7",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ndrm/tests: helpers: Avoid a driver uaf\nwhen using __drm_kunit_helper_alloc_drm_device() the driver may be\ndereferenced by device-managed resources up until the device is\nfreed, which is typically later than the kunit-managed resource code\nfrees it. Fix this by simply make the driver device-managed as well.\nIn short, the sequence leading to the UAF is as follows:\nINIT:\nCode allocates a struct device as a kunit-managed resource.\nCode allocates a drm driver as a kunit-managed resource.\nCode allocates a drm device as a device-managed resource.\nEXIT:\nKunit resource cleanup frees the drm driver\nKunit resource cleanup puts the struct device, which starts a\ndevice-managed resource cleanup\ndevice-managed cleanup calls drm_dev_put()\ndrm_dev_put() dereferences the (now freed) drm driver -> Boom.\nRelated KASAN message:\n[55272.551542] ==================================================================\n[55272.551551] BUG: KASAN: slab-use-after-free in drm_dev_put.part.0+0xd4/0xe0 [drm]\n[55272.551603] Read of size 8 at addr ffff888127502828 by task kunit_try_catch/10353\n[55272.551612] CPU: 4 PID: 10353 Comm: kunit_try_catch Tainted: G     U           N 6.5.0-rc7+ #155\n[55272.551620] Hardware name: ASUS System Product Name/PRIME B560M-A AC, BIOS 0403 01/26/2021\n[55272.551626] Call Trace:\n[55272.551629]  <TASK>\n[55272.551633]  dump_stack_lvl+0x57/0x90\n[55272.551639]  print_report+0xcf/0x630\n[55272.551645]  ? _raw_spin_lock_irqsave+0x5f/0x70\n[55272.551652]  ? drm_dev_put.part.0+0xd4/0xe0 [drm]\n[55272.551694]  kasan_report+0xd7/0x110\n[55272.551699]  ? drm_dev_put.part.0+0xd4/0xe0 [drm]\n[55272.551742]  drm_dev_put.part.0+0xd4/0xe0 [drm]\n[55272.551783]  devres_release_all+0x15d/0x1f0\n[55272.551790]  ? __pfx_devres_release_all+0x10/0x10\n[55272.551797]  device_unbind_cleanup+0x16/0x1a0\n[55272.551802]  device_release_driver_internal+0x3e5/0x540\n[55272.551808]  ? kobject_put+0x5d/0x4b0\n[55272.551814]  bus_remove_device+0x1f1/0x3f0\n[55272.551819]  device_del+0x342/0x910\n[55272.551826]  ? __pfx_device_del+0x10/0x10\n[55272.551830]  ? lock_release+0x339/0x5e0\n[55272.551836]  ? kunit_remove_resource+0x128/0x290 [kunit]\n[55272.551845]  ? __pfx_lock_release+0x10/0x10\n[55272.551851]  platform_device_del.part.0+0x1f/0x1e0\n[55272.551856]  ? _raw_spin_unlock_irqrestore+0x30/0x60\n[55272.551863]  kunit_remove_resource+0x195/0x290 [kunit]\n[55272.551871]  ? _raw_spin_unlock_irqrestore+0x30/0x60\n[55272.551877]  kunit_cleanup+0x78/0x120 [kunit]\n[55272.551885]  ? __kthread_parkme+0xc1/0x1f0\n[55272.551891]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10 [kunit]\n[55272.551900]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [kunit]\n[55272.551909]  kunit_generic_run_threadfn_adapter+0x4a/0x90 [kunit]\n[55272.551919]  kthread+0x2e7/0x3c0\n[55272.551924]  ? __pfx_kthread+0x10/0x10\n[55272.551929]  ret_from_fork+0x2d/0x70\n[55272.551935]  ? __pfx_kthread+0x10/0x10\n[55272.551940]  ret_from_fork_asm+0x1b/0x30\n[55272.551948]  </TASK>\n[55272.551953] Allocated by task 10351:\n[55272.551956]  kasan_save_stack+0x1c/0x40\n[55272.551962]  kasan_set_track+0x21/0x30\n[55272.551966]  __kasan_kmalloc+0x8b/0x90\n[55272.551970]  __kmalloc+0x5e/0x160\n[55272.551976]  kunit_kmalloc_array+0x1c/0x50 [kunit]\n[55272.551984]  drm_exec_test_init+0xfa/0x2c0 [drm_exec_test]\n[55272.551991]  kunit_try_run_case+0xdd/0x250 [kunit]\n[55272.551999]  kunit_generic_run_threadfn_adapter+0x4a/0x90 [kunit]\n[55272.552008]  kthread+0x2e7/0x3c0\n[55272.552012]  ret_from_fork+0x2d/0x70\n[55272.552017]  ret_from_fork_asm+0x1b/0x30\n[55272.552024] Freed by task 10353:\n[55272.552027]  kasan_save_stack+0x1c/0x40\n[55272.552032]  kasan_set_track+0x21/0x30\n[55272.552036]  kasan_save_free_info+0x27/0x40\n[55272.552041]  __kasan_slab_free+0x106/0x180\n[55272.552046]  slab_free_freelist_hook+0xb3/0x160\n[55272.552051]  __kmem_cache_free+0xb2/0x290\n[55272.552056]  kunit_remove_resource+0x195/0x290 [kunit]\n[55272.552064]  kunit_cleanup+0x7\n---truncated---" ],
  "statement" : "This issue is limited to the DRM KUnit testing helpers and does not affect production kernels.\nThe use-after-free could only be triggered when running unit tests with CONFIG_KUNIT enabled.\nIn normal deployments without KUnit, the bug is not reachable and poses no security risk.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-53235\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53235\nhttps://lore.kernel.org/linux-cve-announce/2025091515-CVE-2023-53235-1104@gregkh/T" ],
  "name" : "CVE-2023-53235",
  "csaw" : false
}