In the Linux kernel, the following vulnerability has been resolved: ext4: fix undefined behavior in bit shift for ext4_check_flag_values Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in fs/ext4/ext4.h:591:2 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c ext4_init_fs+0x5a/0x277 do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>

Metrics

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.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/205ac16628aca9093931fcbdb4bcd00d0eb94132 cve-icon cve-icon
https://git.kernel.org/stable/c/3bf678a0f9c017c9ba7c581541dbc8453452a7ae cve-icon cve-icon
https://git.kernel.org/stable/c/4690a4bdcf1470cb161aff1be30bd143b9dffd89 cve-icon cve-icon
https://git.kernel.org/stable/c/5da9e607547f73dc7a643f35b0487992fd66910f cve-icon cve-icon
https://git.kernel.org/stable/c/743e9d708743d98464ccbd56e820d87dc6d1d629 cve-icon cve-icon
https://git.kernel.org/stable/c/7753d6657873a2523a9989e6c09090cd503bbcda cve-icon cve-icon
https://git.kernel.org/stable/c/d7f93fc6fba8ff017be871be7edf8614a785ccad cve-icon cve-icon
https://git.kernel.org/stable/c/dd5639d36a5e4e42fd0fe05cc0b2ad9ddd3fca9d cve-icon cve-icon
https://git.kernel.org/stable/c/f9cd6980800bbfd11bf94eb5f942049d4d4eaa52 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091852-CVE-2022-50403-0471@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50403 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50403 cve-icon
History

Fri, 19 Sep 2025 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Fri, 19 Sep 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

Thu, 18 Sep 2025 16:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ext4: fix undefined behavior in bit shift for ext4_check_flag_values Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in fs/ext4/ext4.h:591:2 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c ext4_init_fs+0x5a/0x277 do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>
Title ext4: fix undefined behavior in bit shift for ext4_check_flag_values
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-09-18T16:03:48.950Z

Updated: 2025-09-18T16:03:48.950Z

Reserved: 2025-09-17T14:53:06.999Z

Link: CVE-2022-50403

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-09-18T16:15:43.377

Modified: 2025-09-18T16:15:43.377

Link: CVE-2022-50403

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-09-18T00:00:00Z

Links: CVE-2022-50403 - Bugzilla