FKIE_CVE-2025-71305

Vulnerability from fkie_nvd - Published: 2026-05-27 14:16 - Updated: 2026-05-27 14:48
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/display/dp_mst: Add protection against 0 vcpi When releasing a timeslot there is a slight chance we may end up with the wrong payload mask due to overflow if the delayed_destroy_work ends up coming into play after a DP 2.1 monitor gets disconnected which causes vcpi to become 0 then we try to make the payload = ~BIT(vcpi - 1) which is a negative shift. VCPI id should never really be 0 hence skip changing the payload mask if VCPI is 0. Otherwise it leads to <7> [515.287237] xe 0000:03:00.0: [drm:drm_dp_mst_get_port_malloc [drm_display_helper]] port ffff888126ce9000 (3) <4> [515.287267] -----------[ cut here ]----------- <3> [515.287268] UBSAN: shift-out-of-bounds in ../drivers/gpu/drm/display/drm_dp_mst_topology.c:4575:36 <3> [515.287271] shift exponent -1 is negative <4> [515.287275] CPU: 7 UID: 0 PID: 3108 Comm: kworker/u64:33 Tainted: G S U 6.17.0-rc6-lgci-xe-xe-3795-3e79699fa1b216e92+ #1 PREEMPT(voluntary) <4> [515.287279] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER <4> [515.287279] Hardware name: ASUS System Product Name/PRIME Z790-P WIFI, BIOS 1645 03/15/2024 <4> [515.287281] Workqueue: drm_dp_mst_wq drm_dp_delayed_destroy_work [drm_display_helper] <4> [515.287303] Call Trace: <4> [515.287304] <TASK> <4> [515.287306] dump_stack_lvl+0xc1/0xf0 <4> [515.287313] dump_stack+0x10/0x20 <4> [515.287316] __ubsan_handle_shift_out_of_bounds+0x133/0x2e0 <4> [515.287324] ? drm_atomic_get_private_obj_state+0x186/0x1d0 <4> [515.287333] drm_dp_atomic_release_time_slots.cold+0x17/0x3d [drm_display_helper] <4> [515.287355] mst_connector_atomic_check+0x159/0x180 [xe] <4> [515.287546] drm_atomic_helper_check_modeset+0x4d9/0xfa0 <4> [515.287550] ? __ww_mutex_lock.constprop.0+0x6f/0x1a60 <4> [515.287562] intel_atomic_check+0x119/0x2b80 [xe] <4> [515.287740] ? find_held_lock+0x31/0x90 <4> [515.287747] ? lock_release+0xce/0x2a0 <4> [515.287754] drm_atomic_check_only+0x6a2/0xb40 <4> [515.287758] ? drm_atomic_add_affected_connectors+0x12b/0x140 <4> [515.287765] drm_atomic_commit+0x6e/0xf0 <4> [515.287766] ? _pfx__drm_printfn_info+0x10/0x10 <4> [515.287774] drm_client_modeset_commit_atomic+0x25c/0x2b0 <4> [515.287794] drm_client_modeset_commit_locked+0x60/0x1b0 <4> [515.287795] ? mutex_lock_nested+0x1b/0x30 <4> [515.287801] drm_client_modeset_commit+0x26/0x50 <4> [515.287804] __drm_fb_helper_restore_fbdev_mode_unlocked+0xdc/0x110 <4> [515.287810] drm_fb_helper_hotplug_event+0x120/0x140 <4> [515.287814] drm_fbdev_client_hotplug+0x28/0xd0 <4> [515.287819] drm_client_hotplug+0x6c/0xf0 <4> [515.287824] drm_client_dev_hotplug+0x9e/0xd0 <4> [515.287829] drm_kms_helper_hotplug_event+0x1a/0x30 <4> [515.287834] drm_dp_delayed_destroy_work+0x3df/0x410 [drm_display_helper] <4> [515.287861] process_one_work+0x22b/0x6f0 <4> [515.287874] worker_thread+0x1e8/0x3d0 <4> [515.287879] ? __pfx_worker_thread+0x10/0x10 <4> [515.287882] kthread+0x11c/0x250 <4> [515.287886] ? __pfx_kthread+0x10/0x10 <4> [515.287890] ret_from_fork+0x2d7/0x310 <4> [515.287894] ? __pfx_kthread+0x10/0x10 <4> [515.287897] ret_from_fork_asm+0x1a/0x30
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/342ccffd9f77fc29fe1c05fd145e4d842bd2feaa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f44cdb5371faf225af37d5caba8f21ec0572469
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d2ccdea18b564e3f73e3e543854acea64e6277d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95dbd525efce2a9e9e1c50ad15213de644c85ad0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac9a7c329a5610051fc476644c9b9145a5965ecb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6afc7539ce06dadfa5b4787b3cfe79b95d8f67a
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/display/dp_mst: Add protection against 0 vcpi\n\nWhen releasing a timeslot there is a slight chance we may end up\nwith the wrong payload mask due to overflow if the delayed_destroy_work\nends up coming into play after a DP 2.1 monitor gets disconnected\nwhich causes vcpi to become 0 then we try to make the payload =\n~BIT(vcpi - 1) which is a negative shift. VCPI id should never\nreally be 0 hence skip changing the payload mask if VCPI is 0.\n\nOtherwise it leads to\n\u003c7\u003e [515.287237] xe 0000:03:00.0: [drm:drm_dp_mst_get_port_malloc\n[drm_display_helper]] port ffff888126ce9000 (3)\n\u003c4\u003e [515.287267] -----------[ cut here ]-----------\n\u003c3\u003e [515.287268] UBSAN: shift-out-of-bounds in\n../drivers/gpu/drm/display/drm_dp_mst_topology.c:4575:36\n\u003c3\u003e [515.287271] shift exponent -1 is negative\n\u003c4\u003e [515.287275] CPU: 7 UID: 0 PID: 3108 Comm: kworker/u64:33 Tainted: G\nS U 6.17.0-rc6-lgci-xe-xe-3795-3e79699fa1b216e92+ #1 PREEMPT(voluntary)\n\u003c4\u003e [515.287279] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER\n\u003c4\u003e [515.287279] Hardware name: ASUS System Product Name/PRIME Z790-P\nWIFI, BIOS 1645 03/15/2024\n\u003c4\u003e [515.287281] Workqueue: drm_dp_mst_wq drm_dp_delayed_destroy_work\n[drm_display_helper]\n\u003c4\u003e [515.287303] Call Trace:\n\u003c4\u003e [515.287304] \u003cTASK\u003e\n\u003c4\u003e [515.287306] dump_stack_lvl+0xc1/0xf0\n\u003c4\u003e [515.287313] dump_stack+0x10/0x20\n\u003c4\u003e [515.287316] __ubsan_handle_shift_out_of_bounds+0x133/0x2e0\n\u003c4\u003e [515.287324] ? drm_atomic_get_private_obj_state+0x186/0x1d0\n\u003c4\u003e [515.287333] drm_dp_atomic_release_time_slots.cold+0x17/0x3d\n[drm_display_helper]\n\u003c4\u003e [515.287355] mst_connector_atomic_check+0x159/0x180 [xe]\n\u003c4\u003e [515.287546] drm_atomic_helper_check_modeset+0x4d9/0xfa0\n\u003c4\u003e [515.287550] ? __ww_mutex_lock.constprop.0+0x6f/0x1a60\n\u003c4\u003e [515.287562] intel_atomic_check+0x119/0x2b80 [xe]\n\u003c4\u003e [515.287740] ? find_held_lock+0x31/0x90\n\u003c4\u003e [515.287747] ? lock_release+0xce/0x2a0\n\u003c4\u003e [515.287754] drm_atomic_check_only+0x6a2/0xb40\n\u003c4\u003e [515.287758] ? drm_atomic_add_affected_connectors+0x12b/0x140\n\u003c4\u003e [515.287765] drm_atomic_commit+0x6e/0xf0\n\u003c4\u003e [515.287766] ? _pfx__drm_printfn_info+0x10/0x10\n\u003c4\u003e [515.287774] drm_client_modeset_commit_atomic+0x25c/0x2b0\n\u003c4\u003e [515.287794] drm_client_modeset_commit_locked+0x60/0x1b0\n\u003c4\u003e [515.287795] ? mutex_lock_nested+0x1b/0x30\n\u003c4\u003e [515.287801] drm_client_modeset_commit+0x26/0x50\n\u003c4\u003e [515.287804] __drm_fb_helper_restore_fbdev_mode_unlocked+0xdc/0x110\n\u003c4\u003e [515.287810] drm_fb_helper_hotplug_event+0x120/0x140\n\u003c4\u003e [515.287814] drm_fbdev_client_hotplug+0x28/0xd0\n\u003c4\u003e [515.287819] drm_client_hotplug+0x6c/0xf0\n\u003c4\u003e [515.287824] drm_client_dev_hotplug+0x9e/0xd0\n\u003c4\u003e [515.287829] drm_kms_helper_hotplug_event+0x1a/0x30\n\u003c4\u003e [515.287834] drm_dp_delayed_destroy_work+0x3df/0x410\n[drm_display_helper]\n\u003c4\u003e [515.287861] process_one_work+0x22b/0x6f0\n\u003c4\u003e [515.287874] worker_thread+0x1e8/0x3d0\n\u003c4\u003e [515.287879] ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e [515.287882] kthread+0x11c/0x250\n\u003c4\u003e [515.287886] ? __pfx_kthread+0x10/0x10\n\u003c4\u003e [515.287890] ret_from_fork+0x2d7/0x310\n\u003c4\u003e [515.287894] ? __pfx_kthread+0x10/0x10\n\u003c4\u003e [515.287897] ret_from_fork_asm+0x1a/0x30"
    }
  ],
  "id": "CVE-2025-71305",
  "lastModified": "2026-05-27T14:48:31.480",
  "metrics": {},
  "published": "2026-05-27T14:16:43.000",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/342ccffd9f77fc29fe1c05fd145e4d842bd2feaa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f44cdb5371faf225af37d5caba8f21ec0572469"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4d2ccdea18b564e3f73e3e543854acea64e6277d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95dbd525efce2a9e9e1c50ad15213de644c85ad0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ac9a7c329a5610051fc476644c9b9145a5965ecb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d6afc7539ce06dadfa5b4787b3cfe79b95d8f67a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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