High 7.0Published Sep 25, 2026

CVE-2026-98027net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size

Updated under an hour ago (Oct 27, 2026, 3:23 PM 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: mv88e6xxx: bound the policy rule dump by the caller's buffer size mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while dumping the policy IDR, clobbering the input value before it has been looked at. That input is the number of 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 policy 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. Count into a local so the caller's limit survives the walk, and stop with -EMSGSIZE once it is reached.

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 da7dc87553046a43be1620a783ce3d9f6583d322 before 7e4bfc5f0b66feb22cba821303fc25ca22cd0887; from da7dc87553046a43be1620a783ce3d9f6583d322 before 01124cd2cf4b71755b1130ac82d78dcfbd5d69e3; from da7dc87553046a43be1620a783ce3d9f6583d322 before 609c4378f212cf580aae02250f1146caf63d873f; from da7dc87553046a43be1620a783ce3d9f6583d322 before c5b5c52b6524c9fb50def2260baac745c095ec3a; from da7dc87553046a43be1620a783ce3d9f6583d322 before 44cd4674d9aa5bdf793b8a8b481c9e8536ed6070; from da7dc87553046a43be1620a783ce3d9f6583d322 before 7a683c2b062810bca203e41866389daf387c235b; from da7dc87553046a43be1620a783ce3d9f6583d322 before cda5ac8fe8ac8e80b1703ebb8c4250726fc19739; from da7dc87553046a43be1620a783ce3d9f6583d322 before b1fffc273112e7284c5b705e186b43b5770cd3d5	CNA record

References

References

https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887
https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3
https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f
https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a
https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070
https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b
https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739
https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5

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.