High 7.0Published Sep 25, 2026

CVE-2026-98030net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size

Updated under an hour ago (Oct 27, 2026, 11:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7318166cacad158b46240f66250d7cc5a481653b before ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e; 7318166cacad158b46240f66250d7cc5a481653b builds before 8e41ce02589c92356bfd8ef62f6ceff840546e1a; from 7318166cacad158b46240f66250d7cc5a481653b before f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4; from 7318166cacad158b46240f66250d7cc5a481653b before f5e93162b3dd195bfda815e8f7a39aaf1d45437b; from 7318166cacad158b46240f66250d7cc5a481653b before f1a2869b3629c0e8394b77b38cb9f19a018c653c; from 7318166cacad158b46240f66250d7cc5a481653b before fd1a78c16b1f6978c09cf048e15f349732e4c707; from 7318166cacad158b46240f66250d7cc5a481653b before b231b6d8516d3fe0d4bba549908e08d26a4531a5; from 7318166cacad158b46240f66250d7cc5a481653b before cdb719f4b8596d9ccee2d56d204c2c4dce982f46	CNA record

References

References

https://git.kernel.org/stable/c/ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e
https://git.kernel.org/stable/c/8e41ce02589c92356bfd8ef62f6ceff840546e1a
https://git.kernel.org/stable/c/f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4
https://git.kernel.org/stable/c/f5e93162b3dd195bfda815e8f7a39aaf1d45437b
https://git.kernel.org/stable/c/f1a2869b3629c0e8394b77b38cb9f19a018c653c
https://git.kernel.org/stable/c/fd1a78c16b1f6978c09cf048e15f349732e4c707
https://git.kernel.org/stable/c/b231b6d8516d3fe0d4bba549908e08d26a4531a5
https://git.kernel.org/stable/c/cdb719f4b8596d9ccee2d56d204c2c4dce982f46

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.