7.8

CVE-2023-53222: linux Out-of-bounds Read

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2023-53222DEBIAN-CVE-2023-53222
Published 15-09-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2023-53222 is a high (CVSS 7.8) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 14
SUSE-SU-2025:03600-1SUSE-SU-2025:03615-1SUSE-SU-2025:03628-1SUSE-SU-2025:03634-1SUSE-SU-2025:20851-1SUSE-SU-2025:20861-1

Timeline

  1. 15-09-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.16% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu124 products
  • linuxAll versions (No fix recorded) | < 5.4.0-166.183 | < 5.15.0-86.96
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1113.123 | < 5.15.0-1047.52
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8c1efe3f74a7864461b0dff281c5562154b4aa8e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a4855aeb13e4ad1f23e16753b68212e180f7d848 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 47b7eaae08e8b2f25bdf37bc14d21be090bcb20f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < de984faecddb900fa850af4df574a25b32bb93f5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c7feb54b113802d2aba98708769d3c33fb017254 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2a03c4e683d33d17b667418eb717b13dda1fac6b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 11509910c599cbd04585ec35a6d5e1a0053d84c1 | 2.6.12
  • linux_kernel< 4.14.322 | ≥ 4.15, < 4.19.291 | ≥ 4.20, < 5.4.251 | ≥ 5.5, < 5.10.188 | ≥ 5.11, < 5.15.121 | ≥ 5.16, < 6.1.40 | ≥ 6.2, < 6.4.5
Debian1 product
  • linux< 6.1.52-1 | < 6.4.11-1

3 vendors · 127 products

References

12 links
Show all 12 references