CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of the bcm_sf2 driver, specifically in the function that retrieves CFP rules, which does not properly limit the number of rules returned based on the caller's buffer size. This oversight can lead to buffer overflows, allowing unauthorized users to potentially access sensitive memory areas, which could result in system crashes or arbitrary code execution. Organizations using affected Linux kernel versions, particularly those with the bcm_sf2 driver, should prioritize remediation to mitigate the risk of exploitation.
Original NVD Description
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.