CVE-2022-50092

dm thin: fix use-after-free crash in dm_sm_register_threshold_callback

MEDIUM

5.5

CVSS Score

Published: June 18, 2025 at 11:02 AM UTC

Updated: June 17, 2026 at 05:22 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: dm thin: fix use-after-free crash in dm_sm_register_threshold_callback Fault inject on pool metadata device reports: BUG: KASAN: use-after-free in dm_pool_register_metadata_threshold+0x40/0x80 Read of size 8 at addr ffff8881b9d50068 by task dmsetup/950 CPU: 7 PID: 950 Comm: dmsetup Tainted: G W 5.19.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 print_address_description.constprop.0.cold+0xeb/0x3f4 kasan_report.cold+0xe6/0x147 dm_pool_register_metadata_threshold+0x40/0x80 pool_ctr+0xa0a/0x1150 dm_table_add_target+0x2c8/0x640 table_load+0x1fd/0x430 ctl_ioctl+0x2c4/0x5a0 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb3/0xd0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 This can be easily reproduced using: echo offline > /sys/block/sda/device/state dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10 dmsetup load pool --table "0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0" If a metadata commit fails, the transaction will be aborted and the metadata space maps will be destroyed. If a DM table reload then happens for this failed thin-pool, a use-after-free will occur in dm_sm_register_threshold_callback (called from dm_pool_register_metadata_threshold). Fix this by in dm_pool_register_metadata_threshold() by returning the -EINVAL error if the thin-pool is in fail mode. Also fail pool_ctr() with a new error message: "Error registering metadata threshold".

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.10 ≤ v < 5.10.1373.10 ≤ v < 5.15.613.10 ≤ v < 5.18.183.10 ≤ v < 5.19.23.10 ≤ v < 5.4.2113.10 ≤ v < 6.05.11 ≤ v < 5.15.615.16 ≤ v < 5.18.185.19 ≤ v < 5.19.25.5 ≤ v < 5.10.1373.10ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e

Vendor states this is fixed in 05cef0999b3208b5a6ede1bfac855139e4de55ef (fixed)

Vendor states this is fixed in 1a199fa9217d28511ff88529238fd9980ea64cf3 (fixed)

Vendor states this is fixed in 3534e5a5ed2997ca1b00f44a0378a075bd05e8a3 (fixed)

Vendor states this is fixed in 5e2cf705155a1514be3c96ea664a9cd356998ee7 (fixed)

Vendor states this is fixed in e4dbe24f4bfd8377e7ba79fdcdb7c4d6eb1c6790 (fixed)

Vendor states this is fixed in f83131a3071a0b61a4d7dca70f95adb3ffad920e (fixed)

Vendor states this is fixed in 3.10 (unaffected)

Vendor states this is fixed in 5.10.137 (unaffected)

Vendor states this is fixed in 5.15.61 (unaffected)

Vendor states this is fixed in 5.18.18 (unaffected)

Vendor states this is fixed in 5.19.2 (unaffected)

Vendor states this is fixed in 5.4.211 (unaffected)