cbcvebase.
CVE-2022-48734
published 2024-06-20

CVE-2022-48734: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock between quota disable and qgroup rescan worker Quota disable ioctl…

PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.18%
7.5th percentile
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock between quota disable and qgroup rescan worker Quota disable ioctl starts a transaction before waiting for the qgroup rescan worker completes. However, this wait can be infinite and results in deadlock because of circular dependency among the quota disable ioctl, the qgroup rescan worker and the other task with transaction such as block group relocation task. The deadlock happens with the steps following: 1) Task A calls ioctl to disable quota. It starts a transaction and waits for qgroup rescan worker completes. 2) Task B such as block group relocation task starts a transaction and joins to the transaction that task A started. Then task B commits to the transaction. In this commit, task B waits for a commit by task A. 3) Task C as the qgroup rescan worker starts its job and starts a transaction. In this transaction start, task C waits for completion of the transaction that task A started and task B committed. This deadlock was found with fstests test case btrfs/115 and a zoned null_blk device. The test case enables and disables quota, and the block group reclaim was triggered during the quota disable by chance. The deadlock was also observed by running quota enable and disable in parallel with 'btrfs balance' command on regular null_blk devices. An example report of the deadlock: [372.469894] INFO: task kworker/u16:6:103 blocked for more than 122 seconds. [372.479944] Not tainted 5.16.0-rc8 #7 [372.485067] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [372.493898] task:kworker/u16:6 state:D stack: 0 pid: 103 ppid: 2 flags:0x00004000 [372.503285] Workqueue: btrfs-qgroup-rescan btrfs_work_helper [btrfs] [372.510782] Call Trace: [372.514092] [372.521684] __schedule+0xb56/0x4850 [372.530104] ? io_schedule_timeout+0x190/0x190 [372.538842] ? lockdep_hardirqs_on+0x7e/0x100 [372.547092] ? _raw_spin_unlock_irqrestore+0x3e/0x60 [372.555591] schedule+0xe0

Affected

15 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.16.10-1 (bookworm)linux 5.16.10-1 (bookworm)
linuxlinux——
linuxlinux>= 967ef5131e42d6e3bb216c44161d893048a49957 < 26b3901d20bf9da2c6a00cb1fb48932166f80a4526b3901d20bf9da2c6a00cb1fb48932166f80a45
linuxlinux>= 967ef5131e42d6e3bb216c44161d893048a49957 < 32747e01436aac8ef93fe85b5b523b4f3b52f04032747e01436aac8ef93fe85b5b523b4f3b52f040
linuxlinux>= 967ef5131e42d6e3bb216c44161d893048a49957 < 89d4cca583fc9594ee7d1a0bc986886d6fb587e689d4cca583fc9594ee7d1a0bc986886d6fb587e6
linuxlinux>= 967ef5131e42d6e3bb216c44161d893048a49957 < 31198e58c09e21d4f65c49d2361f76b87aca4c3f31198e58c09e21d4f65c49d2361f76b87aca4c3f
linuxlinux>= 967ef5131e42d6e3bb216c44161d893048a49957 < e804861bd4e69cc5fe1053eedcb024982dde8e48e804861bd4e69cc5fe1053eedcb024982dde8e48
linuxlinux_kernel< 5.4.1785.4.178
linuxlinux_kernel>= 0 < 5.10.103-15.10.103-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 5.11 < 5.15.225.15.22
linuxlinux_kernel>= 5.16 < 5.16.85.16.8
linuxlinux_kernel>= 5.5 < 5.10.995.10.99

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.