Detections
Analytics
CVE-2026-98027
high
Description
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.
References
https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739
https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a
https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5
https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887
https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b
https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f
https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070
https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3