CVE-2024-26892

wifi: mt76: mt7921e: fix use-after-free in free_irq()

State: Published
Severity: Not scored
Published: Apr 17, 2024
Updated: May 23, 2026
Reserved: Feb 19, 2024

Description

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

wifi: mt76: mt7921e: fix use-after-free in free_irq()

From commit a304e1b82808 ("[PATCH] Debug shared irqs"), there is a test to make sure the shared irq handler should be able to handle the unexpected event after deregistration. For this case, let's apply MT76_REMOVED flag to indicate the device was removed and do not run into the resource access anymore.

BUG: KASAN: use-after-free in mt7921_irq_handler+0xd8/0x100 [mt7921e] Read of size 8 at addr ffff88824a7d3b78 by task rmmod/11115 CPU: 28 PID: 11115 Comm: rmmod Tainted: G W L 5.17.0 #10 Hardware name: Micro-Star International Co., Ltd. MS-7D73/MPG B650I EDGE WIFI (MS-7D73), BIOS 1.81 01/05/2024 Call Trace: <TASK> dump_stack_lvl+0x6f/0xa0 print_address_description.constprop.0+0x1f/0x190 ? mt7921_irq_handler+0xd8/0x100 [mt7921e] ? mt7921_irq_handler+0xd8/0x100 [mt7921e] kasan_report.cold+0x7f/0x11b ? mt7921_irq_handler+0xd8/0x100 [mt7921e] mt7921_irq_handler+0xd8/0x100 [mt7921e] free_irq+0x627/0xaa0 devm_free_irq+0x94/0xd0 ? devm_request_any_context_irq+0x160/0x160 ? kobject_put+0x18d/0x4a0 mt7921_pci_remove+0x153/0x190 [mt7921e] pci_device_remove+0xa2/0x1d0 __device_release_driver+0x346/0x6e0 driver_detach+0x1ef/0x2c0 bus_remove_driver+0xe7/0x2d0 ? __check_object_size+0x57/0x310 pci_unregister_driver+0x26/0x250 __do_sys_delete_module+0x307/0x510 ? free_module+0x6a0/0x6a0 ? fpregs_assert_state_consistent+0x4b/0xb0 ? rcu_read_lock_sched_held+0x10/0x70 ? syscall_enter_from_user_mode+0x20/0x70 ? trace_hardirqs_on+0x1c/0x130 do_syscall_64+0x5c/0x80 ? trace_hardirqs_on_prepare+0x72/0x160 ? do_syscall_64+0x68/0x80 ? trace_hardirqs_on_prepare+0x72/0x160 entry_SYSCALL_64_after_hwframe+0x44/0xae

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9270270d62191b7549296721e8d5f3dc0df01563 to before c7dd42fbebcfb02bef070fd48f774d6412d0b49dAffected 9270270d62191b7549296721e8d5f3dc0df01563 to before bfe1adf1606f76c180324e53b130f0e76d5cc6c3Affected 9270270d62191b7549296721e8d5f3dc0df01563 to before bfeaef901194c5923ce3330272786eff2fac513aAffected 9270270d62191b7549296721e8d5f3dc0df01563 to before c957280ef6ab6bdf559a91ae693a6b34310697e3Affected a76eaaaafd8b408238d7865bbbbd311f08988f3dAffected 95e41ac30a0d0b3637f0b3c93235a7a107a2fb7fAffected 6.2.15 to before 6.3Affected 6.3.2 to before 6.4Affected
LinuxLinux	6.4Affected before 6.4Not affected 6.6.23 through 6.6.Not affected 6.7.11 through 6.7.Not affected 6.8.2 through 6.8.*Not affected 6.9 and laterNot affected

Product

Versions

LinuxLinux

9270270d62191b7549296721e8d5f3dc0df01563 to before c7dd42fbebcfb02bef070fd48f774d6412d0b49dAffected
9270270d62191b7549296721e8d5f3dc0df01563 to before bfe1adf1606f76c180324e53b130f0e76d5cc6c3Affected
9270270d62191b7549296721e8d5f3dc0df01563 to before bfeaef901194c5923ce3330272786eff2fac513aAffected
9270270d62191b7549296721e8d5f3dc0df01563 to before c957280ef6ab6bdf559a91ae693a6b34310697e3Affected
a76eaaaafd8b408238d7865bbbbd311f08988f3dAffected
95e41ac30a0d0b3637f0b3c93235a7a107a2fb7fAffected
6.2.15 to before 6.3Affected
6.3.2 to before 6.4Affected

LinuxLinux

6.4Affected
before 6.4Not affected
6.6.23 through 6.6.*Not affected
6.7.11 through 6.7.*Not affected
6.8.2 through 6.8.*Not affected
6.9 and laterNot affected

References

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