In the Linux kernel, the following vulnerability has been resolved: jfs: jfs_dmap: Validate db_l2nbperpage while mounting In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting. Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181. Thus, make sure that db_l2nbperpage is correct while mounting. Max number of blocks per page = Page size / Min block size => log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size) => Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE

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/11509910c599cbd04585ec35a6d5e1a0053d84c1 cve-icon cve-icon
https://git.kernel.org/stable/c/2a03c4e683d33d17b667418eb717b13dda1fac6b cve-icon cve-icon
https://git.kernel.org/stable/c/47b7eaae08e8b2f25bdf37bc14d21be090bcb20f cve-icon cve-icon
https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8e cve-icon cve-icon
https://git.kernel.org/stable/c/a4855aeb13e4ad1f23e16753b68212e180f7d848 cve-icon cve-icon
https://git.kernel.org/stable/c/c7feb54b113802d2aba98708769d3c33fb017254 cve-icon cve-icon
https://git.kernel.org/stable/c/de984faecddb900fa850af4df574a25b32bb93f5 cve-icon cve-icon
https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091513-CVE-2023-53222-c1a9@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-53222 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-53222 cve-icon
History

Wed, 17 Sep 2025 11:00:00 +0000

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

Tue, 16 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

Mon, 15 Sep 2025 14:45:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: jfs: jfs_dmap: Validate db_l2nbperpage while mounting In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting. Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181. Thus, make sure that db_l2nbperpage is correct while mounting. Max number of blocks per page = Page size / Min block size => log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size) => Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE
Title jfs: jfs_dmap: Validate db_l2nbperpage while mounting
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-09-15T14:21:50.970Z

Updated: 2025-09-15T14:21:50.970Z

Reserved: 2025-09-15T14:19:21.845Z

Link: CVE-2023-53222

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-15T15:15:48.983

Modified: 2025-09-15T15:22:27.090

Link: CVE-2023-53222

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-09-15T00:00:00Z

Links: CVE-2023-53222 - Bugzilla