CVE-2026-98030

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7318166cacad158b46240f66250d7cc5a481653b < f1a2869b3629c0e8394b77b38cb9f19a018c653caffected
LinuxLinux7318166cacad158b46240f66250d7cc5a481653b < fd1a78c16b1f6978c09cf048e15f349732e4c707affected
LinuxLinux7318166cacad158b46240f66250d7cc5a481653b < b231b6d8516d3fe0d4bba549908e08d26a4531a5affected
LinuxLinux7318166cacad158b46240f66250d7cc5a481653b < cdb719f4b8596d9ccee2d56d204c2c4dce982f46affected
LinuxLinux4.11affected
LinuxLinux0 < 4.11unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References