CVE-2026-98027
CVE CVE-2026-98027EUVD EUVD-2026-86680Published 2026-09-25T10:23:45.000ZLast changed 2026-09-25T14:41:52.000ZCVSS 7.0
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 5.4; da7dc87553046a43be1620a783ce3d9f6583d322 <b1fffc273112e7284c5b705e186b43b5770cd3d5; patch: 6.12.111; patch: 6.18.53; da7dc87553046a43be1620a783ce3d9f6583d322 <cda5ac8fe8ac8e80b1703ebb8c4250726fc19739; da7dc87553046a43be1620a783ce3d9f6583d322 <44cd4674d9aa5bdf793b8a8b481c9e8536ed6070; patch: 7.3-rc3; patch: 0; da7dc87553046a43be1620a783ce3d9f6583d322 <7a683c2b062810bca203e41866389daf387c235b; patch: 7.2.7
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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