CVE-2024-56557

Local kernel memory corruption via undersized transfer buffers

Published Dec 27, 2024 · Updated Aug 5, 2026

Heap buffer overflow in the AD7923 IIO ADC driver in affected Linux kernels allows local users to corrupt kernel memory via IIO sysfs. ad7923_update_scan_mode() sizes tx_buf and ring_xfer for four transfers but iterates the active scan mask for eight-channel AD7908, AD7918, and AD7928 devices. Access to writable IIO scan-element and buffer controls on one of those SPI ADC devices is required; triggering five or more channels overwrites adjacent kernel heap state and crashes the kernel.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the AD7923 IIO ADC driver in affected Linux kernels allows local users to corrupt kernel memory via IIO sysfs. ad7923_update_scan_mode() sizes tx_buf and ring_xfer for four transfers but iterates the active scan mask for eight-channel AD7908, AD7918, and AD7928 devices. Access to writable IIO scan-element and buffer controls on one of those SPI ADC devices is required; triggering five or more channels overwrites adjacent kernel heap state and crashes the kernel.

The record

CVE
CVE-2024-56557
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120, T1068
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=5.6
  2. Affected versionversion=851644a60d200c9a294de5a5594004bcf13d34c7 <00663d3e000c31d0d49ef86a809f5c107c2d09cd
  3. Affected versionversion=851644a60d200c9a294de5a5594004bcf13d34c7 <218ecc35949129171ca39bcc0d407c8dc4cd0bbc
  4. Affected versionversion=851644a60d200c9a294de5a5594004bcf13d34c7 <3a4187ec454e19903fd15f6e1825a4b84e59a4cd
  5. Affected versionversion=851644a60d200c9a294de5a5594004bcf13d34c7 <6e4d236d9c4b38571c394d3ab6e85dfb71c33ed3
  6. Affected versionversion=851644a60d200c9a294de5a5594004bcf13d34c7 <e5cac32721997cb8bcb208a29f4598b3faf46338

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=851644a60d200c9a294de5a5594004bcf13d34c7 <00663d3e000c31d0d49ef86a809f5c107c2d09cd; version=851644a60d200c9a294de5a5594004bcf13d34c7 <218ecc35949129171ca39bcc0d407c8dc4cd0bbc; version=851644a60d200c9a294de5a5594004bcf13d34c7 <3a4187ec454e19903fd15f6e1825a4b84e59a4cd; version=851644a60d200c9a294de5a5594004bcf13d34c7 <6e4d236d9c4b38571c394d3ab6e85dfb71c33ed3; version=851644a60d200c9a294de5a5594004bcf13d34c7 <e5cac32721997cb8bcb208a29f4598b3faf46338

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1068Exploitation for Privilege Escalation

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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