{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.170-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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 \u003c7\u003e [515.287237] xe 0000:03:00.0: [drm:drm_dp_mst_get_port_malloc [drm_display_helper]] port ffff888126ce9000 (3) \u003c4\u003e [515.287267] -----------[ cut here ]----------- \u003c3\u003e [515.287268] UBSAN: shift-out-of-bounds in ../drivers/gpu/drm/display/drm_dp_mst_topology.c:4575:36 \u003c3\u003e [515.287271] shift exponent -1 is negative \u003c4\u003e [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) \u003c4\u003e [515.287279] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER \u003c4\u003e [515.287279] Hardware name: ASUS System Product Name/PRIME Z790-P WIFI, BIOS 1645 03/15/2024 \u003c4\u003e [515.287281] Workqueue: drm_dp_mst_wq drm_dp_delayed_destroy_work [drm_display_helper] \u003c4\u003e [515.287303] Call Trace: \u003c4\u003e [515.287304] \u003cTASK\u003e \u003c4\u003e [515.287306] dump_stack_lvl+0xc1/0xf0 \u003c4\u003e [515.287313] dump_stack+0x10/0x20 \u003c4\u003e [515.287316] __ubsan_handle_shift_out_of_bounds+0x133/0x2e0 \u003c4\u003e [515.287324] ? drm_atomic_get_private_obj_state+0x186/0x1d0 \u003c4\u003e [515.287333] drm_dp_atomic_release_time_slots.cold+0x17/0x3d [drm_display_helper] \u003c4\u003e [515.287355] mst_connector_atomic_check+0x159/0x180 [xe] \u003c4\u003e [515.287546] drm_atomic_helper_check_modeset+0x4d9/0xfa0 \u003c4\u003e [515.287550] ? __ww_mutex_lock.constprop.0+0x6f/0x1a60 \u003c4\u003e [515.287562] intel_atomic_check+0x119/0x2b80 [xe] \u003c4\u003e [515.287740] ? find_held_lock+0x31/0x90 \u003c4\u003e [515.287747] ? lock_release+0xce/0x2a0 \u003c4\u003e [515.287754] drm_atomic_check_only+0x6a2/0xb40 \u003c4\u003e [515.287758] ? drm_atomic_add_affected_connectors+0x12b/0x140 \u003c4\u003e [515.287765] drm_atomic_commit+0x6e/0xf0 \u003c4\u003e [515.287766] ? _pfx__drm_printfn_info+0x10/0x10 \u003c4\u003e [515.287774] drm_client_modeset_commit_atomic+0x25c/0x2b0 \u003c4\u003e [515.287794] drm_client_modeset_commit_locked+0x60/0x1b0 \u003c4\u003e [515.287795] ? mutex_lock_nested+0x1b/0x30 \u003c4\u003e [515.287801] drm_client_modeset_commit+0x26/0x50 \u003c4\u003e [515.287804] __drm_fb_helper_restore_fbdev_mode_unlocked+0xdc/0x110 \u003c4\u003e [515.287810] drm_fb_helper_hotplug_event+0x120/0x140 \u003c4\u003e [515.287814] drm_fbdev_client_hotplug+0x28/0xd0 \u003c4\u003e [515.287819] drm_client_hotplug+0x6c/0xf0 \u003c4\u003e [515.287824] drm_client_dev_hotplug+0x9e/0xd0 \u003c4\u003e [515.287829] drm_kms_helper_hotplug_event+0x1a/0x30 \u003c4\u003e [515.287834] drm_dp_delayed_destroy_work+0x3df/0x410 [drm_display_helper] \u003c4\u003e [515.287861] process_one_work+0x22b/0x6f0 \u003c4\u003e [515.287874] worker_thread+0x1e8/0x3d0 \u003c4\u003e [515.287879] ? __pfx_worker_thread+0x10/0x10 \u003c4\u003e [515.287882] kthread+0x11c/0x250 \u003c4\u003e [515.287886] ? __pfx_kthread+0x10/0x10 \u003c4\u003e [515.287890] ret_from_fork+0x2d7/0x310 \u003c4\u003e [515.287894] ? __pfx_kthread+0x10/0x10 \u003c4\u003e [515.287897] ret_from_fork_asm+0x1a/0x30",
  "id": "DEBIAN-CVE-2025-71305",
  "modified": "2026-09-01T19:48:02.682353139Z",
  "published": "2026-05-27T14:16:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2025-71305"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2025-71305"
  ]
}