In the Linux kernel, the following vulnerability has been resolved:
class: fix use-after-free in class_register()
The lock_class_key is still registered and can be found in lock_keys_hash hlist after subsys_private is freed in error handler path.A task who iterate over the lock_keys_hash later may cause use-after-free.So fix that up and unregister the lock_class_key before kfree(cp).
On our platform, a driver fails to kset_register because of creating duplicate filename '/class/xxx'.With Kasan enabled, it prints a invalid-access bug report.
KASAN bug report:
BUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc Write of size 8 at addr 15ffff808b8c0368 by task modprobe/252 Pointer tag: [15], memory tag: [fe]
CPU: 7 PID: 252 Comm: modprobe Tainted: G W 6.6.0-mainline-maybe-dirty #1
Call trace: dump_backtrace+0x1b0/0x1e4 show_stack+0x2c/0x40 dump_stack_lvl+0xac/0xe0 print_report+0x18c/0x4d8 kasan_report+0xe8/0x148 __hwasan_store8_noabort+0x88/0x98 lockdep_register_key+0x19c/0x1bc class_register+0x94/0x1ec init_module+0xbc/0xf48 [rfkill] do_one_initcall+0x17c/0x72c do_init_module+0x19c/0x3f8 ... Memory state around the buggy address: ffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a ffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe >ffffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
As CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access not use-after-free here.In this case, modprobe is manipulating the corrupted lock_keys_hash hlish where lock_class_key is already freed before.
It's worth noting that this only can happen if lockdep is enabled, which is not true for normal system.
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 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2024 |
| Ubuntu | — | Upgrade linux-image-azure-fdeUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.5.0-1024-oemUpgrade linux-image-raspiUpgrade linux-image-awsUpgrade linux-image-6.5.0-1018-raspiUpgrade linux-image-nvidia-64k-6.5Upgrade linux-image-lowlatencyUpgrade linux-image-6.5.0-1021-awsUpgrade linux-image-starfiveUpgrade linux-image-kvmUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.5.0-1024-oracleUpgrade linux-image-6.5.0-1024-oracle-64kUpgrade linux-image-6.5.0-1021-nvidia-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-6.5Upgrade linux-image-raspi-nolpaeUpgrade linux-image-azureUpgrade linux-image-6.5.0-1015-starfiveUpgrade linux-image-6.5.0-1017-laptopUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.5.0-1021-nvidiaUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.5.0-41-lowlatencyUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gcpUpgrade linux-image-genericUpgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-laptop-23.10Upgrade linux-image-6.5.0-1022-gcpUpgrade linux-image-oem-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-6.5.0-1022-azure-fdeUpgrade linux-image-6.5.0-1022-azureUpgrade linux-image-6.5.0-41-lowlatency-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-generic-64kUpgrade linux-image-6.5.0-41-genericUpgrade linux-image-6.5.0-41-generic-64kUpgrade linux-image-virtualUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-oracle | May 17, 2024 | Feb 26, 2024 |
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