CVE-2026-98030

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

State: Published
Severity: 7.0 High
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7318166cacad158b46240f66250d7cc5a481653b to before ca49c526291d7cd3a5cb49b0edd7f50a5ae7176eAffected 7318166cacad158b46240f66250d7cc5a481653b to before 8e41ce02589c92356bfd8ef62f6ceff840546e1aAffected 7318166cacad158b46240f66250d7cc5a481653b to before f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4Affected 7318166cacad158b46240f66250d7cc5a481653b to before f5e93162b3dd195bfda815e8f7a39aaf1d45437bAffected 7318166cacad158b46240f66250d7cc5a481653b to before f1a2869b3629c0e8394b77b38cb9f19a018c653cAffected 7318166cacad158b46240f66250d7cc5a481653b to before fd1a78c16b1f6978c09cf048e15f349732e4c707Affected 7318166cacad158b46240f66250d7cc5a481653b to before b231b6d8516d3fe0d4bba549908e08d26a4531a5Affected 7318166cacad158b46240f66250d7cc5a481653b to before cdb719f4b8596d9ccee2d56d204c2c4dce982f46Affected
LinuxLinux	4.11Affected before 4.11Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

7318166cacad158b46240f66250d7cc5a481653b to before ca49c526291d7cd3a5cb49b0edd7f50a5ae7176eAffected
7318166cacad158b46240f66250d7cc5a481653b to before 8e41ce02589c92356bfd8ef62f6ceff840546e1aAffected
7318166cacad158b46240f66250d7cc5a481653b to before f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4Affected
7318166cacad158b46240f66250d7cc5a481653b to before f5e93162b3dd195bfda815e8f7a39aaf1d45437bAffected
7318166cacad158b46240f66250d7cc5a481653b to before f1a2869b3629c0e8394b77b38cb9f19a018c653cAffected
7318166cacad158b46240f66250d7cc5a481653b to before fd1a78c16b1f6978c09cf048e15f349732e4c707Affected
7318166cacad158b46240f66250d7cc5a481653b to before b231b6d8516d3fe0d4bba549908e08d26a4531a5Affected
7318166cacad158b46240f66250d7cc5a481653b to before cdb719f4b8596d9ccee2d56d204c2c4dce982f46Affected

LinuxLinux

4.11Affected
before 4.11Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.