CVE-2026-74455

Out-of-bounds access via unchecked uCAN record lengths

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds memory access in affected Linux kernel releases from 4.0 allows attackers to cause unspecified impact via malformed uCAN records. pcan_usb_fd_decode_buf() reads type-specific headers and copies CAN payload bytes from a packed USB buffer without first confirming that each complete record fits. Reachability requires the peak_usb driver and a PEAK USB CAN interface; Oracle assesses local availability impact, while Amazon assesses physical confidentiality impact.

CVSS severity5.5
Medium
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 memory access in affected Linux kernel releases from 4.0 allows attackers to cause unspecified impact via malformed uCAN records. pcan_usb_fd_decode_buf() reads type-specific headers and copies CAN payload bytes from a packed USB buffer without first confirming that each complete record fits. Reachability requires the peak_usb driver and a PEAK USB CAN interface; Oracle assesses local availability impact, while Amazon assesses physical confidentiality impact.

The record

CVE
CVE-2026-74455
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=0a25e1f4f18566b750ebd3ae995af64e23111e63 <2427ef427bdd78d862c7c76597bfd9eda88b81f1
  2. Affected versionversion=0a25e1f4f18566b750ebd3ae995af64e23111e63 <2c8f08f3641a074da40acf05baa5a18ae2739260
  3. Affected versionversion=0a25e1f4f18566b750ebd3ae995af64e23111e63 <6067c878e38d02a3d5c43497347e143f85c9064a
  4. Affected versionversion=0a25e1f4f18566b750ebd3ae995af64e23111e63 <93fcab2c6968446316bbb49548848df604d6346f
  5. Affected versionversion=0a25e1f4f18566b750ebd3ae995af64e23111e63 <d9c115948c3dd5fcc2d0245cec5eb76c098503c8
  6. Affected versionversion=4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0a25e1f4f18566b750ebd3ae995af64e23111e63 <2427ef427bdd78d862c7c76597bfd9eda88b81f1; version=0a25e1f4f18566b750ebd3ae995af64e23111e63 <2c8f08f3641a074da40acf05baa5a18ae2739260; version=0a25e1f4f18566b750ebd3ae995af64e23111e63 <6067c878e38d02a3d5c43497347e143f85c9064a; version=0a25e1f4f18566b750ebd3ae995af64e23111e63 <93fcab2c6968446316bbb49548848df604d6346f; version=0a25e1f4f18566b750ebd3ae995af64e23111e63 <d9c115948c3dd5fcc2d0245cec5eb76c098503c8; version=4.0

Published CVSS scores

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

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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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