CVE-2022-50412

drm: bridge: adv7511: unregister cec i2c device after cec adapter

State: Published
Severity: 7.8 High
Published: Sep 18, 2025
Updated: May 11, 2026
Reserved: Sep 17, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

drm: bridge: adv7511: unregister cec i2c device after cec adapter

cec_unregister_adapter() assumes that the underlying adapter ops are callable. For example, if the CEC adapter currently has a valid physical address, then the unregistration procedure will invalidate the physical address by setting it to f.f.f.f. Whence the following kernel oops observed after removing the adv7511 module:

Unable to handle kernel execution of user memory at virtual address 0000000000000000 Internal error: Oops: 86000004 [#1] PREEMPT_RT SMP Call trace: 0x0 adv7511_cec_adap_log_addr+0x1ac/0x1c8 [adv7511] cec_adap_unconfigure+0x44/0x90 [cec] __cec_s_phys_addr.part.0+0x68/0x230 [cec] __cec_s_phys_addr+0x40/0x50 [cec] cec_unregister_adapter+0xb4/0x118 [cec] adv7511_remove+0x60/0x90 [adv7511] i2c_device_remove+0x34/0xe0 device_release_driver_internal+0x114/0x1f0 driver_detach+0x54/0xe0 bus_remove_driver+0x60/0xd8 driver_unregister+0x34/0x60 i2c_del_driver+0x2c/0x68 adv7511_exit+0x1c/0x67c [adv7511] __arm64_sys_delete_module+0x154/0x288 invoke_syscall+0x48/0x100 el0_svc_common.constprop.0+0x48/0xe8 do_el0_svc+0x28/0x88 el0_svc+0x1c/0x50 el0t_64_sync_handler+0xa8/0xb0 el0t_64_sync+0x15c/0x160 Code: bad PC value ---[ end trace 0000000000000000 ]---

Protect against this scenario by unregistering i2c_cec after unregistering the CEC adapter. Duly disable the CEC clock afterwards too.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 3747465c5da7a11957a34bbb9485d9fc253b91ccAffected 3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before f369fb4deed7ab997cfa703dc85ec08b3adc1af8Affected 3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 4d4d5bc659206b187263190ad9a03513f625659dAffected 3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 86ae5170786aea3e1751123ca55700fb9b37b623Affected 3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 40cdb02cb9f965732eb543d47f15bef8d10f0f5fAffected
LinuxLinux	4.15Affected before 4.15Not affected 5.10.234 through 5.10.Not affected 5.15.75 through 5.15.Not affected 5.19.17 through 5.19.Not affected 6.0.3 through 6.0.Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 3747465c5da7a11957a34bbb9485d9fc253b91ccAffected
3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before f369fb4deed7ab997cfa703dc85ec08b3adc1af8Affected
3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 4d4d5bc659206b187263190ad9a03513f625659dAffected
3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 86ae5170786aea3e1751123ca55700fb9b37b623Affected
3b1b975003e4a3da4b93ab032487a3ae4afca7b5 to before 40cdb02cb9f965732eb543d47f15bef8d10f0f5fAffected

LinuxLinux

4.15Affected
before 4.15Not affected
5.10.234 through 5.10.*Not affected
5.15.75 through 5.15.*Not affected
5.19.17 through 5.19.*Not affected
6.0.3 through 6.0.*Not affected
6.1 and laterNot affected

References

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