CVE-2024-56616

Kernel memory corruption via zero-length MST message

Published Dec 27, 2024 · Updated May 11, 2026

Memory corruption in Linux DRM DisplayPort MST code allows physically proximate attackers to corrupt kernel memory via a branch device. drm_dp_decode_sideband_msg_hdr accepts a zero message length even though the trailing body CRC requires at least one byte, so drm_dp_sideband_append_payload indexes before the buffer and passes an underflowed length to memcpy. A crafted or faulty DisplayPort MST branch device is required; published evidence demonstrates kernel-memory corruption but does not establish a specific follow-on outcome.

CVSS severity7.0
High
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

Memory corruption in Linux DRM DisplayPort MST code allows physically proximate attackers to corrupt kernel memory via a branch device. drm_dp_decode_sideband_msg_hdr accepts a zero message length even though the trailing body CRC requires at least one byte, so drm_dp_sideband_append_payload indexes before the buffer and passes an underflowed length to memcpy. A crafted or faulty DisplayPort MST branch device is required; published evidence demonstrates kernel-memory corruption but does not establish a specific follow-on outcome.

The record

CVE
CVE-2024-56616
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.17
  2. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <109f91d8b9335b0f3714ef9920eae5a8b21d56af
  3. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <1fc1f32c4a3421b9d803f18ec3ef49db2fb5d5ef
  4. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <70e7166612f4e6da8d7d0305c47c465d88d037e5
  5. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <780fa184d4dc38ad6c4fded345ab8f9be7a63e96
  6. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <bd2fccac61b40eaf08d9546acc9fef958bfe4763
  7. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <c58947a8d4a500902597ee1dbadf0518d7ff8801

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <109f91d8b9335b0f3714ef9920eae5a8b21d56af; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <1fc1f32c4a3421b9d803f18ec3ef49db2fb5d5ef; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <70e7166612f4e6da8d7d0305c47c465d88d037e5; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <780fa184d4dc38ad6c4fded345ab8f9be7a63e96; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <bd2fccac61b40eaf08d9546acc9fef958bfe4763; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <c58947a8d4a500902597ee1dbadf0518d7ff8801

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0UbuntuCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

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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