ghsa-93qw-f7pr-wpxr
Vulnerability from github
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: 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": [],
"aliases": [
"CVE-2022-50092"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:38Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: fix use-after-free crash in dm_sm_register_threshold_callback\n\nFault inject on pool metadata device reports:\n BUG: KASAN: use-after-free in dm_pool_register_metadata_threshold+0x40/0x80\n Read of size 8 at addr ffff8881b9d50068 by task dmsetup/950\n\n CPU: 7 PID: 950 Comm: dmsetup Tainted: G W 5.19.0-rc6 #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x34/0x44\n print_address_description.constprop.0.cold+0xeb/0x3f4\n kasan_report.cold+0xe6/0x147\n dm_pool_register_metadata_threshold+0x40/0x80\n pool_ctr+0xa0a/0x1150\n dm_table_add_target+0x2c8/0x640\n table_load+0x1fd/0x430\n ctl_ioctl+0x2c4/0x5a0\n dm_ctl_ioctl+0xa/0x10\n __x64_sys_ioctl+0xb3/0xd0\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis can be easily reproduced using:\n echo offline \u003e /sys/block/sda/device/state\n dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10\n dmsetup load pool --table \"0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0\"\n\nIf a metadata commit fails, the transaction will be aborted and the\nmetadata space maps will be destroyed. If a DM table reload then\nhappens for this failed thin-pool, a use-after-free will occur in\ndm_sm_register_threshold_callback (called from\ndm_pool_register_metadata_threshold).\n\nFix this by in dm_pool_register_metadata_threshold() by returning the\n-EINVAL error if the thin-pool is in fail mode. Also fail pool_ctr()\nwith a new error message: \"Error registering metadata threshold\".",
"id": "GHSA-93qw-f7pr-wpxr",
"modified": "2025-06-18T12:30:48Z",
"published": "2025-06-18T12:30:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50092"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/05cef0999b3208b5a6ede1bfac855139e4de55ef"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1a199fa9217d28511ff88529238fd9980ea64cf3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3534e5a5ed2997ca1b00f44a0378a075bd05e8a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5e2cf705155a1514be3c96ea664a9cd356998ee7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e4dbe24f4bfd8377e7ba79fdcdb7c4d6eb1c6790"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f83131a3071a0b61a4d7dca70f95adb3ffad920e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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