CVE-2023-53222

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Source
https://cve.org/CVERecord?id=CVE-2023-53222
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53222.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-53222
Downstream
Related
Published
2025-09-15T14:21:50.970Z
Modified
2026-03-20T12:33:02.227340Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
jfs: jfs_dmap: Validate db_l2nbperpage while mounting
Details

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

jfs: jfsdmap: Validate dbl2nbperpage while mounting

In jfsdmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). dbl2nbperpage, 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

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53222.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
8c1efe3f74a7864461b0dff281c5562154b4aa8e
Fixed
ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2
Fixed
a4855aeb13e4ad1f23e16753b68212e180f7d848
Fixed
47b7eaae08e8b2f25bdf37bc14d21be090bcb20f
Fixed
de984faecddb900fa850af4df574a25b32bb93f5
Fixed
c7feb54b113802d2aba98708769d3c33fb017254
Fixed
2a03c4e683d33d17b667418eb717b13dda1fac6b
Fixed
11509910c599cbd04585ec35a6d5e1a0053d84c1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53222.json"