CVE-2026-68277

One-byte memory over-read via sideband reply parsing

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds reads in Linux 3.17 and later allow local users to read one byte beyond malformed DisplayPort MST sideband replies. Three reply parsers consume the second byte of 16-bit bandwidth fields before checking whether idx + 2 exceeds raw->curlen. Reachability requires DisplayPort MST; the extra byte comes from neighboring parser state, while Red Hat rates the availability impact high.

CVSS severity5.5
Medium
EPSS probability0.22%
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 3.17 and later allow local users to read one byte beyond malformed DisplayPort MST sideband replies. Three reply parsers consume the second byte of 16-bit bandwidth fields before checking whether idx + 2 exceeds raw->curlen. Reachability requires DisplayPort MST; the extra byte comes from neighboring parser state, while Red Hat rates the availability impact high.

The record

CVE
CVE-2026-68277
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

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 <0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df
  3. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73
  4. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <6b89ba3dba2f583626fb693e47e951ffb8bf591f
  5. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <bdf0508b1e6785d4a8982c637e97e68d60b47d7b
  6. Affected versionversion=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <d5c70523cafa26ad2c7a37b612849abe2683baa8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <6b89ba3dba2f583626fb693e47e951ffb8bf591f; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <bdf0508b1e6785d4a8982c637e97e68d60b47d7b; version=ad7f8a1f9ced7f049f9b66d588723f243a7034cd <d5c70523cafa26ad2c7a37b612849abe2683baa8

Published CVSS scores

5.5Red HatCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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