CVE-2026-98030

Kernel crash via undersized CFP rule buffer

Published Sep 25, 2026 · Updated Sep 25, 2026

Out-of-bounds write in the Linux bcm_sf2 DSA driver allows local users to corrupt kernel memory through an ethtool rule-list ioctl. bcm_sf2_cfp_rule_get_all() copies every set CFP bitmap entry into rule_locs[] without stopping at the caller-supplied nfc->rule_cnt allocation size, and a zero count leaves the destination NULL. An administrator must first install CFP rules; an unprivileged local caller can then crash the kernel or corrupt kernel memory by requesting zero or too few slots.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux bcm_sf2 DSA driver allows local users to corrupt kernel memory through an ethtool rule-list ioctl. bcm_sf2_cfp_rule_get_all() copies every set CFP bitmap entry into rule_locs[] without stopping at the caller-supplied nfc->rule_cnt allocation size, and a zero count leaves the destination NULL. An administrator must first install CFP rules; an unprivileged local caller can then crash the kernel or corrupt kernel memory by requesting zero or too few slots.

The record

CVE
CVE-2026-98030
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=4.11
  2. Affected versionversion=7318166cacad158b46240f66250d7cc5a481653b <b231b6d8516d3fe0d4bba549908e08d26a4531a5
  3. Affected versionversion=7318166cacad158b46240f66250d7cc5a481653b <cdb719f4b8596d9ccee2d56d204c2c4dce982f46
  4. Affected versionversion=7318166cacad158b46240f66250d7cc5a481653b <f1a2869b3629c0e8394b77b38cb9f19a018c653c
  5. Affected versionversion=7318166cacad158b46240f66250d7cc5a481653b <fd1a78c16b1f6978c09cf048e15f349732e4c707

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=7318166cacad158b46240f66250d7cc5a481653b <b231b6d8516d3fe0d4bba549908e08d26a4531a5; version=7318166cacad158b46240f66250d7cc5a481653b <cdb719f4b8596d9ccee2d56d204c2c4dce982f46; version=7318166cacad158b46240f66250d7cc5a481653b <f1a2869b3629c0e8394b77b38cb9f19a018c653c; version=7318166cacad158b46240f66250d7cc5a481653b <fd1a78c16b1f6978c09cf048e15f349732e4c707

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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