CVE-2024-36478 (GCVE-0-2024-36478)

Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2025-11-03 21:55
VLAI?
Title
null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues' Writing 'power' and 'submit_queues' concurrently will trigger kernel panic: Test script: modprobe null_blk nr_devices=0 mkdir -p /sys/kernel/config/nullb/nullb0 while true; do echo 1 > submit_queues; echo 4 > submit_queues; done & while true; do echo 1 > power; echo 0 > power; done Test result: BUG: kernel NULL pointer dereference, address: 0000000000000148 Oops: 0000 [#1] PREEMPT SMP RIP: 0010:__lock_acquire+0x41d/0x28f0 Call Trace: <TASK> lock_acquire+0x121/0x450 down_write+0x5f/0x1d0 simple_recursive_removal+0x12f/0x5c0 blk_mq_debugfs_unregister_hctxs+0x7c/0x100 blk_mq_update_nr_hw_queues+0x4a3/0x720 nullb_update_nr_hw_queues+0x71/0xf0 [null_blk] nullb_device_submit_queues_store+0x79/0xf0 [null_blk] configfs_write_iter+0x119/0x1e0 vfs_write+0x326/0x730 ksys_write+0x74/0x150 This is because del_gendisk() can concurrent with blk_mq_update_nr_hw_queues(): nullb_device_power_store nullb_apply_submit_queues null_del_dev del_gendisk nullb_update_nr_hw_queues if (!dev->nullb) // still set while gendisk is deleted return 0 blk_mq_update_nr_hw_queues dev->nullb = NULL Fix this problem by resuing the global mutex to protect nullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < 1d4c8baef435c98e8d5aa7027dc5a9f70834ba16 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < aaadb755f2d684f715a6eb85cb7243aa0c67dfa9 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < 5d0495473ee4c1d041b5a917f10446a22c047f47 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < a2db328b0839312c169eb42746ec46fc1ab53ed2 (git)
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    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 6.1.119 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.9.4 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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