net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size (CVE-2026-98030) | HOL Guard CVE

High · CVSS 7.0CVE-2026-98030

net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size

Answer in brief

CVE-2026-98030 records a High severity (CVSS 7.0) vulnerability in net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.0
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=7318166cacad158b46240f66250d7cc5a481653b <f1a2869b3629c0e8394b77b38cb9f19a018c653c \|\| >=7318166cacad158b46240f66250d7cc5a481653b <fd1a78c16b1f6978c09cf048e15f349732e4c707 \|\| >=7318166cacad158b46240f66250d7cc5a481653b <b231b6d8516d3fe0d4bba549908e08d26a4531a5 \|\| >=7318166cacad158b46240f66250d7cc5a481653b <cdb719f4b8596d9ccee2d56d204c2c4dce982f46	f1a2869b3629c0e8394b77b38cb9f19a018c653c, fd1a78c16b1f6978c09cf048e15f349732e4c707, b231b6d8516d3fe0d4bba549908e08d26a4531a5, cdb719f4b8596d9ccee2d56d204c2c4dce982f46
Linux/Linuxgeneric	4.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to f1a2869b3629c0e8394b77b38cb9f19a018c653c if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size bcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into rule_locs[] without consulting nfc->rule_cnt, which is how many entries the caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the buffer from the rule_cnt userspace passes in, so once an admin has installed CFP rules any user can ask for fewer slots than there are rules and run off the end of the allocation. A rule_cnt of 0 leaves the buffer pointer NULL and the walk dereferences it.

Quoted source text, attributed separately from HOL analysis.