In the Linux kernel, the following vulnerability has been resolved:

ext4: fix use-after-free in ext4_orphan_cleanup

I caught a issue as follows:
==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0
Read of size 8 at addr ffff88814b13f378 by task mount/710

CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370
Call Trace:
<TASK>
dump_stack_lvl+0x73/0x9f
print_report+0x25d/0x759
kasan_report+0xc0/0x120
__asan_load8+0x99/0x140
__list_add_valid+0x28/0x1a0
ext4_orphan_cleanup+0x564/0x9d0 [ext4]
__ext4_fill_super+0x48e2/0x5300 [ext4]
ext4_fill_super+0x19f/0x3a0 [ext4]
get_tree_bdev+0x27b/0x450
ext4_get_tree+0x19/0x30 [ext4]
vfs_get_tree+0x49/0x150
path_mount+0xaae/0x1350
do_mount+0xe2/0x110
__x64_sys_mount+0xf0/0x190
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
[...]
==================================================================

Above issue may happen as follows:
-------------------------------------
ext4_fill_super
ext4_orphan_cleanup
--- loop1: assume last_orphan is 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan)
ext4_truncate --> return 0
ext4_inode_attach_jinode --> return -ENOMEM
iput(inode) --> free inode<12>
--- loop2: last_orphan is still 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
// use inode<12> and trigger UAF

To solve this issue, we need to propagate the return value of
ext4_inode_attach_jinode() appropriately.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00036.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < 7f801a1593cb957f73659732836b2dafbdfc7709
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < 026a4490b5381229a30f23d073b58e8e35ee6858
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < 7223d5e75f26352354ea2c0ccf8b579821b52adf
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < cf0e0817b0f925b70d101d7014ea81b7094e1159
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < c2bdbd4c69308835d1b6f6ba74feeccbfe113478
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < 7908b8a541b1578cc61b4da7f19b604a931441da
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 affected < a71248b1accb2b42e4980afef4fa4a27fa0e36f5
Linux Linux affected
Version Status Constraints
4.10 affected —
0 unaffected < 4.10
4.19.270 unaffected ≤ 4.19.*
5.4.229 unaffected ≤ 5.4.*
5.10.163 unaffected ≤ 5.10.*
5.15.87 unaffected ≤ 5.15.*
6.0.18 unaffected ≤ 6.0.*
6.1.4 unaffected ≤ 6.1.*
6.2 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/026a4490b5381229a30f23d073b58e8e35ee6858 cve-icon cve-icon
https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf cve-icon cve-icon
https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da cve-icon cve-icon
https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709 cve-icon cve-icon
https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5 cve-icon cve-icon
https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478 cve-icon cve-icon
https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025120947-CVE-2022-50673-f920@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50673 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50673 cve-icon
History

Wed, 10 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Tue, 09 Dec 2025 02:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in ext4_orphan_cleanup I caught a issue as follows: ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710 CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.
Title ext4: fix use-after-free in ext4_orphan_cleanup
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-23T13:30:30.545Z

Reserved: 2025-12-09T01:26:45.991Z

Link: CVE-2022-50673

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-09T16:17:19.473

Modified: 2025-12-09T18:37:13.640

Link: CVE-2022-50673

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-12-09T00:00:00Z

Links: CVE-2022-50673 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.