CVE-2026-68279

Kernel out-of-bounds reads via oversized MST replies

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds reads in Linux DisplayPort MST parsers allow physically proximate attackers to trigger kernel memory over-reads via a malicious hub. drm_dp_sideband_parse_remote_dpcd_read() and drm_dp_sideband_parse_remote_i2c_read_ack() copy num_bytes from raw->msg without ensuring idx plus num_bytes stays within raw->curlen. Reachability requires a DisplayPort MST hub that returns an oversized DPCD or I2C sideband reply; the parsers then consume bytes beyond the received payload, with no reported write primitive.

CVSS severity2.4
Low
EPSS probability0.18%
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 reads in Linux DisplayPort MST parsers allow physically proximate attackers to trigger kernel memory over-reads via a malicious hub. drm_dp_sideband_parse_remote_dpcd_read() and drm_dp_sideband_parse_remote_i2c_read_ack() copy num_bytes from raw->msg without ensuring idx plus num_bytes stays within raw->curlen. Reachability requires a DisplayPort MST hub that returns an oversized DPCD or I2C sideband reply; the parsers then consume bytes beyond the received payload, with no reported write primitive.

The record

CVE
CVE-2026-68279
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=3.17
  2. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <04d953f50d61e542e94a5977822cc53735f8c0ce
  3. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <1a8f537f5a1eeac941f262fe73078d6b08ba83c0
  4. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2
  5. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <533d9e2bede4aeefdc2a0561d7071cfede95958f
  6. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <e6ef5455b06cb4e5d181aabcd723791587c79f12

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <04d953f50d61e542e94a5977822cc53735f8c0ce; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <1a8f537f5a1eeac941f262fe73078d6b08ba83c0; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <533d9e2bede4aeefdc2a0561d7071cfede95958f; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <e6ef5455b06cb4e5d181aabcd723791587c79f12

Published CVSS scores

2.4Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.5Oracle LinuxCVSS: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 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.

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Technologies

Your stack

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Your stack

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