CVE-2023-53222

Kernel crash via unchecked JFS shift count

Published Sep 15, 2025 · Updated Sep 15, 2025

Out-of-bounds shift in Linux JFS allows local users to crash an affected kernel by mounting a crafted filesystem image. dbMount accepts an oversized on-disk db_l2nbperpage value, and BLKTODMAP later uses it as a shift count in dbFree without validating the page geometry. Exploitation requires local access to mount the crafted image and trigger a subsequent JFS block-free operation.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds shift in Linux JFS allows local users to crash an affected kernel by mounting a crafted filesystem image. dbMount accepts an oversized on-disk db_l2nbperpage value, and BLKTODMAP later uses it as a shift count in dbFree without validating the page geometry. Exploitation requires local access to mount the crafted image and trigger a subsequent JFS block-free operation.

The record

CVE
CVE-2023-53222
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11509910c599cbd04585ec35a6d5e1a0053d84c1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a03c4e683d33d17b667418eb717b13dda1fac6b
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47b7eaae08e8b2f25bdf37bc14d21be090bcb20f
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c1efe3f74a7864461b0dff281c5562154b4aa8e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4855aeb13e4ad1f23e16753b68212e180f7d848
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7feb54b113802d2aba98708769d3c33fb017254
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de984faecddb900fa850af4df574a25b32bb93f5
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11509910c599cbd04585ec35a6d5e1a0053d84c1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a03c4e683d33d17b667418eb717b13dda1fac6b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47b7eaae08e8b2f25bdf37bc14d21be090bcb20f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c1efe3f74a7864461b0dff281c5562154b4aa8e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4855aeb13e4ad1f23e16753b68212e180f7d848; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7feb54b113802d2aba98708769d3c33fb017254; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de984faecddb900fa850af4df574a25b32bb93f5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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