CVE-2025-39810

Kernel memory corruption via undersized TX ring array

Published Sep 16, 2025 · Updated Sep 16, 2025

Memory corruption in the Linux bnxt_en network driver allows local users to corrupt kernel memory during an interface shutdown. bnxt_set_dflt_rings fails to scale the TX-ring count by bp->num_tc, leaving bp->tx_ring undersized before bnxt_alloc_cp_rings writes entries. The path requires multiple traffic classes and a firmware resource or capability change during ifdown; no demonstrated outcome beyond kernel memory corruption is published.

CVSS severity7.8
High
EPSS probability0.16%
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 the Linux bnxt_en network driver allows local users to corrupt kernel memory during an interface shutdown. bnxt_set_dflt_rings fails to scale the TX-ring count by bp->num_tc, leaving bp->tx_ring undersized before bnxt_alloc_cp_rings writes entries. The path requires multiple traffic classes and a firmware resource or capability change during ifdown; no demonstrated outcome beyond kernel memory corruption is published.

The record

CVE
CVE-2025-39810
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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=5.4
  2. Affected versionversion=ec5d31e3c15d5233b491400133c67f78a320062c <2747328ba2714f1a7454208dbbc1dc0631990b4a
  3. Affected versionversion=ec5d31e3c15d5233b491400133c67f78a320062c <9ab6a9950f152e094395d2e3967f889857daa185
  4. Affected versionversion=ec5d31e3c15d5233b491400133c67f78a320062c <d00e98977ef519280b075d783653e2c492fffbb6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=ec5d31e3c15d5233b491400133c67f78a320062c <2747328ba2714f1a7454208dbbc1dc0631990b4a; version=ec5d31e3c15d5233b491400133c67f78a320062c <9ab6a9950f152e094395d2e3967f889857daa185; version=ec5d31e3c15d5233b491400133c67f78a320062c <d00e98977ef519280b075d783653e2c492fffbb6

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/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 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-787Out-of-bounds Write

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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