CVE-2025-37791

Kernel crash via pointer-sized CMIS reply length

Published May 1, 2025 · Updated Aug 5, 2026

Stack corruption in Linux 6.11 and later affected branches allows local users to crash the kernel during CMIS firmware flashing. In ethtool_cmis_module_poll(), a one-byte reply object is passed by pointer, but the poll call uses the pointer's size and overwrites seven adjacent stack bytes. A local request needs namespace-scoped CAP_NET_ADMIN and a CMIS transceiver; the observed consequence is an immediate kernel panic.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack corruption in Linux 6.11 and later affected branches allows local users to crash the kernel during CMIS firmware flashing. In ethtool_cmis_module_poll(), a one-byte reply object is passed by pointer, but the poll call uses the pointer's size and overwrites seven adjacent stack bytes. A local request needs namespace-scoped CAP_NET_ADMIN and a CMIS transceiver; the observed consequence is an immediate kernel panic.

The record

CVE
CVE-2025-37791
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.11
  2. Affected versionversion=a39c84d796254e6b1662ca0c46dbc313379e9291 <61765e1b417a23371c3735e3cddf4ad9354ed2e9
  3. Affected versionversion=a39c84d796254e6b1662ca0c46dbc313379e9291 <7eb0a0072f966bb0b01d8b7d529d9743a7187bd1
  4. Affected versionversion=a39c84d796254e6b1662ca0c46dbc313379e9291 <f3fdd4fba16c74697d8bc730b82fb7c1eff7fab3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=a39c84d796254e6b1662ca0c46dbc313379e9291 <61765e1b417a23371c3735e3cddf4ad9354ed2e9; version=a39c84d796254e6b1662ca0c46dbc313379e9291 <7eb0a0072f966bb0b01d8b7d529d9743a7187bd1; version=a39c84d796254e6b1662ca0c46dbc313379e9291 <f3fdd4fba16c74697d8bc730b82fb7c1eff7fab3

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.7CanonicalCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

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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

T1499Endpoint Denial of Service

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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