CVE-2026-74737

Kernel crash via unmasked RX source tag

Published Aug 26, 2026 · Updated Aug 26, 2026

Out-of-bounds access in the Linux AM65 CPSW NUSS Ethernet driver allows remote attackers on an adjacent network to crash the kernel. The receive path stores a full 16-bit DMA Source Tag in port_id even though only its lower eight bits identify a MAC port, so reserved upper bits produce an invalid array index. Exposure requires TI AM65 CPSW NUSS hardware using the affected driver, and the demonstrated consequence is a sporadic system crash.

CVSS severity9.8
Critical
EPSS probability0.56%
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 access in the Linux AM65 CPSW NUSS Ethernet driver allows remote attackers on an adjacent network to crash the kernel. The receive path stores a full 16-bit DMA Source Tag in port_id even though only its lower eight bits identify a MAC port, so reserved upper bits produce an invalid array index. Exposure requires TI AM65 CPSW NUSS hardware using the affected driver, and the demonstrated consequence is a sporadic system crash.

The record

CVE
CVE-2026-74737
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=5.7
  2. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <14fc40bf28390e0ebee6a072457c36b82c614100
  3. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <1c0e35ce761131f82062222779d8574849790892
  4. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <36a05d2820077bb3955acb8111e1041d39148037
  5. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <46a8e084a159e638ac2728e96980b65d752d65fd
  6. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <551688b410d3fb0dae7739724422f268cd9446d6
  7. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <72e4e3d7efc3b7d85f86abbe8b94f8e45074abe3
  8. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <914e0100df3435bd14d09f397238e891cf9b7dce
  9. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <9a220225efd6f58350bbb53fe70bdec08519267f

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=93a76530316a3d8cc2d82c3deca48424fee92100 <14fc40bf28390e0ebee6a072457c36b82c614100; version=93a76530316a3d8cc2d82c3deca48424fee92100 <1c0e35ce761131f82062222779d8574849790892; version=93a76530316a3d8cc2d82c3deca48424fee92100 <36a05d2820077bb3955acb8111e1041d39148037; version=93a76530316a3d8cc2d82c3deca48424fee92100 <46a8e084a159e638ac2728e96980b65d752d65fd; version=93a76530316a3d8cc2d82c3deca48424fee92100 <551688b410d3fb0dae7739724422f268cd9446d6; version=93a76530316a3d8cc2d82c3deca48424fee92100 <72e4e3d7efc3b7d85f86abbe8b94f8e45074abe3; version=93a76530316a3d8cc2d82c3deca48424fee92100 <914e0100df3435bd14d09f397238e891cf9b7dce; version=93a76530316a3d8cc2d82c3deca48424fee92100 <9a220225efd6f58350bbb53fe70bdec08519267f

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3Amazon LinuxCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
9.8CanonicalCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation Flood

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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