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
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | May 28, 2026 | May 28, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 27, 2026 |
| Ubuntu | — | Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-22.04aUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-raspi-6.8Upgrade linux-image-aws-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-6.8.0-134-fipsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-134-genericUpgrade linux-image-ibm-classicUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-awsUpgrade linux-image-fips-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-6.8.0-1060-raspiUpgrade linux-image-gke-64k-6.8Upgrade linux-image-virtual-6.8Upgrade linux-image-6.8.0-1058-nvidia-lowlatencyUpgrade linux-image-xilinx-6.8Upgrade linux-image-6.8.0-134-lowlatencyUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1058-nvidia-lowlatency-64kUpgrade linux-image-gke-64kUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-6.8.0-1062-azure-fipsUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oem-20.04dUpgrade linux-image-raspiUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-1060-ibmUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-1057-oracleUpgrade linux-image-generic-64k-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-ibmUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1029-nvidia-tegra-rtUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-azureUpgrade linux-image-azure-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1058-nvidia-64kUpgrade linux-image-generic-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-kvmUpgrade linux-image-6.8.0-1063-gcp-64kUpgrade linux-image-aws-fipsUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-realtime-6.8.1Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-6.8.0-136-genericUpgrade linux-image-azure-fde-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-1058-gke-64kUpgrade linux-image-oem-22.04Upgrade linux-image-gkeopUpgrade linux-image-genericUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1063-azureUpgrade linux-image-oem-20.04bUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-generic-64kUpgrade linux-image-gcp-6.8Upgrade linux-image-gcpUpgrade linux-image-6.8.0-1060-aws-fipsUpgrade linux-image-6.8.0-1060-aws-64kUpgrade linux-image-6.8.0-1045-gkeopUpgrade linux-image-6.8.0-1029-nvidia-tegraUpgrade linux-image-virtualUpgrade linux-image-realtimeUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oracleUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-nvidiaUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-aws-64kUpgrade linux-image-6.8.0-134-generic-64kUpgrade linux-image-6.8.0-1058-gkeUpgrade linux-image-oem-20.04cUpgrade linux-image-gkeUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-1057-oracle-64kUpgrade linux-image-fipsUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-2049-raspi-realtimeUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-oem-20.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1063-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-nvidia-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1063-gcp-fipsUpgrade linux-image-6.8.0-1060-awsUpgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-laptop-23.10Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-1058-nvidiaUpgrade linux-image-xilinxUpgrade linux-image-oracle-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.1-1055-realtimeUpgrade linux-image-6.8.0-134-lowlatency-64k | Jul 2, 2026 | Jul 1, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 10, 2026 | May 27, 2026 |
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