CVE-2026-98029
HighCVSS 7.0Summary
In the Linux kernel, the nfp ethernet driver dumps ntuple rules into a caller-provided buffer without checking its size. nfp_net_get_fs_loc() writes every entry of nn->fs.list into rule_locs[] while ignoring cmd->rule_cnt, so a user without CAP_NET_ADMIN can call ETHTOOL_GRXCLSRLALL with fewer slots than there are rules and run past the allocation; a rule_cnt of 0 leaves a NULL pointer that gets dereferenced.
Risk Assessment
Once an administrator installs flow steering rules, any local user can trigger a kernel buffer overflow, leading to memory corruption or a system crash (denial of service).
Recommendation
Update the Linux kernel to a version containing the fix that bounds the rule dump by the caller's buffer size and returns -EMSGSIZE when the buffer fills up.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS