CVE-2024-56597

Kernel memory exposure and corruption via negative budmin

Published Dec 27, 2024 · Updated Aug 5, 2026

Out-of-bounds access in Linux JFS allows local users to expose kernel memory, corrupt filesystem data, or interrupt service via a crafted image. dbAllocCtl accepts a negative on-disk dmt_budmin value, letting dbSplit perform an undefined shift and derive out-of-range buddy indices. Exploitation requires mounting an attacker-supplied JFS image or block device and then allocating blocks; the resulting kernel access can disclose memory, corrupt disk state, or crash the host.

CVSS severity7.8
High
EPSS probability0.24%
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 access in Linux JFS allows local users to expose kernel memory, corrupt filesystem data, or interrupt service via a crafted image. dbAllocCtl accepts a negative on-disk dmt_budmin value, letting dbSplit perform an undefined shift and derive out-of-range buddy indices. Exploitation requires mounting an attacker-supplied JFS image or block device and then allocating blocks; the resulting kernel access can disclose memory, corrupt disk state, or crash the host.

The record

CVE
CVE-2024-56597
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51a203470f502a64a3da8dcea51c4748e8267a6c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52756a57e978e2706543a254f88f266cc6702f36
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6676034aa753aa448beb30dbd75630927ba7cd96
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bbb24ce7f06ef9b7c05beb9340787cbe9fd3d08e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c56245baf3fd1f79145dd7408e3ead034b74255c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <df7c76636952670b31bd6c12b3aed3c502122273
  8. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51a203470f502a64a3da8dcea51c4748e8267a6c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52756a57e978e2706543a254f88f266cc6702f36; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6676034aa753aa448beb30dbd75630927ba7cd96; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bbb24ce7f06ef9b7c05beb9340787cbe9fd3d08e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c56245baf3fd1f79145dd7408e3ead034b74255c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <df7c76636952670b31bd6c12b3aed3c502122273; version=2.6.12

Published CVSS scores

5.3SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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-125Out-of-bounds Read
T1565.001Stored Data Manipulation

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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