CVE-2024-57923

Kernel panic via page-rounded zlib input length

Published Jan 19, 2025 · Updated May 11, 2026

Out-of-bounds read in Linux 6.12 through 6.12.9 allows local users to crash debug kernels during Btrfs zlib compression on s390. zlib_compress_folios() sets strm.avail_in to a PAGE_SIZE multiple instead of limiting it to the remaining input, so hardware compression reads past the supplied range. The demonstrated panic requires a debug kernel, Btrfs zlib compression, and the s390 hardware-acceleration path; release-kernel impact is not published.

CVSS severity5.5
Medium
EPSS probability0.21%
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 read in Linux 6.12 through 6.12.9 allows local users to crash debug kernels during Btrfs zlib compression on s390. zlib_compress_folios() sets strm.avail_in to a PAGE_SIZE multiple instead of limiting it to the remaining input, so hardware compression reads past the supplied range. The demonstrated panic requires a debug kernel, Btrfs zlib compression, and the s390 hardware-acceleration path; release-kernel impact is not published.

The record

CVE
CVE-2024-57923
Published
Jan 19, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=6.12
  2. Affected versionversion=fd1e75d0105d2289e24b6d63cee49e6f7952c8bf <0ee4736c003daded513de0ff112d4a1e9c85bbab
  3. Affected versionversion=fd1e75d0105d2289e24b6d63cee49e6f7952c8bf <25adbb08aeadcff883ab801df99fd20fefbb6ca4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=fd1e75d0105d2289e24b6d63cee49e6f7952c8bf <0ee4736c003daded513de0ff112d4a1e9c85bbab; version=fd1e75d0105d2289e24b6d63cee49e6f7952c8bf <25adbb08aeadcff883ab801df99fd20fefbb6ca4

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1Amazon LinuxCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

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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