CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the nfp_net_get_fs_loc() function, which improperly handles the size of the buffer for rule locations, allowing users to read beyond allocated memory when querying flow steering rules. This can lead to potential information disclosure or application crashes due to dereferencing a NULL pointer when a rule count of zero is provided. Administrators and developers managing Linux systems with flow steering capabilities should prioritize addressing this issue to mitigate risks associated with unauthorized access and system instability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: eth: nfp: bound the ntuple rule dump by the caller's buffer size nfp_net_get_fs_loc() dumps every entry of nn->fs.list into rule_locs[] without consulting cmd->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 flow steering 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. Bail out with -EMSGSIZE when the buffer fills up, the way the other ntuple capable drivers do, and report how many locations were filled so a shrinking rule list does not leave the caller reading stale slots.