In the Linux kernel, the following vulnerability has been resolved:
drm: zynqmp_dpsub: Always register bridge
We must always register the DRM bridge, since zynqmp_dp_hpd_work_func calls drm_bridge_hpd_notify, which in turn expects hpd_mutex to be initialized. We do this before zynqmp_dpsub_drm_init since that calls drm_bridge_attach. This fixes the following lockdep warning:
[ 19.217084] ------------[ cut here ]------------ [ 19.227530] DEBUG_LOCKS_WARN_ON(lock->magic != lock) [ 19.227768] WARNING: CPU: 0 PID: 140 at kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550 [ 19.241696] Modules linked in: [ 19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 Not tainted 6.6.20+ #96 [ 19.252046] Hardware name: xlnx,zynqmp (DT) [ 19.256421] Workqueue: events zynqmp_dp_hpd_work_func [ 19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 19.269104] pc : __mutex_lock+0x4bc/0x550 [ 19.273364] lr : __mutex_lock+0x4bc/0x550 [ 19.277592] sp : ffffffc085c5bbe0 [ 19.281066] x29: ffffffc085c5bbe0 x28: 0000000000000000 x27: ffffff88009417f8 [ 19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000 [ 19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 0000000000000000 [ 19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000 [ 19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720 [ 19.318922] x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001 [ 19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9 : 0001ff88003f3888 [ 19.334003] x8 : 0001ff88003f3888 x7 : 0000000000000000 x6 : 0000000000000000 [ 19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000 [ 19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880 [ 19.356581] Call trace: [ 19.359160] __mutex_lock+0x4bc/0x550 [ 19.363032] mutex_lock_nested+0x24/0x30 [ 19.367187] drm_bridge_hpd_notify+0x2c/0x6c [ 19.371698] zynqmp_dp_hpd_work_func+0x44/0x54 [ 19.376364] process_one_work+0x3ac/0x988 [ 19.380660] worker_thread+0x398/0x694 [ 19.384736] kthread+0x1bc/0x1c0 [ 19.388241] ret_from_fork+0x10/0x20 [ 19.392031] irq event stamp: 183 [ 19.395450] hardirqs last enabled at (183): [<ffffffc0800b9278>] finish_task_switch.isra.0+0xa8/0x2d4 [ 19.405140] hardirqs last disabled at (182): [<ffffffc081ad3754>] __schedule+0x714/0xd04 [ 19.413612] softirqs last enabled at (114): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c [ 19.423128] softirqs last disabled at (110): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c [ 19.432614] ---[ end trace 0000000000000000 ]---
(cherry picked from commit 61ba791c4a7a09a370c45b70a81b8c7d4cf6b2ae)
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Suse | — | Upgrade dtb-apmUpgrade dlm-kmp-azureUpgrade kernel-docs-htmlUpgrade kernel-symsUpgrade kernel-kvmsmall-livepatch-develUpgrade dlm-kmp-rtUpgrade dtb-hisiliconUpgrade dlm-kmp-defaultUpgrade dtb-marvellUpgrade cluster-md-kmp-64kbUpgrade kernel-64kb-optionalUpgrade kernel-default-baseUpgrade kernel-docsUpgrade kselftests-kmp-rtUpgrade dtb-nvidiaUpgrade dtb-armUpgrade dtb-amdUpgrade kernel-rt-livepatch-develUpgrade dtb-sprdUpgrade kernel-kvmsmall-vdsoUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debug-vdsoUpgrade kernel-64kb-extraUpgrade kernel-azure-vdsoUpgrade kernel-rt-extraUpgrade kernel-rt_debugUpgrade dtb-appleUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-obs-qaUpgrade dtb-renesasUpgrade cluster-md-kmp-defaultUpgrade dtb-amlogicUpgrade kernel-rt-vdsoUpgrade kernel-default-livepatch-develUpgrade kernel-macrosUpgrade dtb-socionextUpgrade kernel-debug-develUpgrade kernel-debug-livepatch-develUpgrade dtb-broadcomUpgrade kernel-syms-rtUpgrade ocfs2-kmp-rtUpgrade reiserfs-kmp-defaultUpgrade kernel-defaultUpgrade reiserfs-kmp-rtUpgrade kernel-debugUpgrade kernel-default-extraUpgrade kernel-azure-extraUpgrade kernel-azure-optionalUpgrade kernel-64kb-develUpgrade kernel-rt_debug-develUpgrade kernel-devel-azureUpgrade dtb-caviumUpgrade gfs2-kmp-defaultUpgrade gfs2-kmp-64kbUpgrade dtb-freescaleUpgrade reiserfs-kmp-azureUpgrade kernel-rtUpgrade kernel-default-base-rebuildUpgrade kernel-debug-vdsoUpgrade dtb-allwinnerUpgrade cluster-md-kmp-azureUpgrade kernel-default-optionalUpgrade dtb-amazonUpgrade kernel-source-vanillaUpgrade kernel-kvmsmallUpgrade kernel-devel-rtUpgrade ocfs2-kmp-64kbUpgrade kernel-azure-livepatch-develUpgrade kernel-zfcpdumpUpgrade dtb-mediatekUpgrade dtb-lgUpgrade gfs2-kmp-azureUpgrade dtb-rockchipUpgrade kselftests-kmp-azureUpgrade dtb-xilinxUpgrade kernel-kvmsmall-develUpgrade kernel-default-develUpgrade ocfs2-kmp-defaultUpgrade kernel-syms-azureUpgrade kernel-source-azureUpgrade kernel-rt-optionalUpgrade reiserfs-kmp-64kbUpgrade kernel-default-vdsoUpgrade kernel-default-livepatchUpgrade gfs2-kmp-rtUpgrade dtb-alteraUpgrade kernel-obs-buildUpgrade dtb-qcomUpgrade ocfs2-kmp-azureUpgrade kernel-64kb-livepatch-develUpgrade kernel-azureUpgrade dlm-kmp-64kbUpgrade cluster-md-kmp-rtUpgrade kselftests-kmp-64kbUpgrade kernel-source-rtUpgrade kernel-64kbUpgrade kernel-sourceUpgrade kernel-azure-develUpgrade dtb-exynosUpgrade kernel-rt-develUpgrade kernel-devel | Jul 23, 2024 | Jun 24, 2024 |
| Ubuntu | — | Upgrade linux-image-genericUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1013-nvidia-lowlatencyUpgrade linux-image-nvidiaUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1014-azure-fdeUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1013-nvidia-64kUpgrade linux-image-oem-22.04dUpgrade linux-image-gkeUpgrade linux-image-oracle-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-44-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-1014-azureUpgrade linux-image-kvmUpgrade linux-image-6.8.0-45-genericUpgrade linux-image-ibmUpgrade linux-image-ibm-classicUpgrade linux-image-azureUpgrade linux-image-6.8.0-1013-nvidia-lowlatency-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-1011-raspiUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-virtualUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.8.0-1013-nvidiaUpgrade linux-image-6.8.0-44-genericUpgrade linux-image-6.8.0-1012-oemUpgrade linux-image-gcpUpgrade linux-image-6.8.0-45-generic-64kUpgrade linux-image-6.8.0-1014-gcpUpgrade linux-image-6.8.0-1010-gkeUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-oracleUpgrade linux-image-6.8.0-1015-awsUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1012-oracleUpgrade linux-image-azure-fdeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1012-oracle-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-44-lowlatencyUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-44-generic-64kUpgrade linux-image-6.8.0-1012-ibmUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-aws | Sep 12, 2024 | Jun 24, 2024 |
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