CVE-2024-26733 is an out-of-bounds write in the Linux kernel IPv4 ARP ioctl handling path. When a process issues SIOCGARP, arp_req_get() copies a neighbour entry's hardware address into arpreq.arp_ha.sa_data. This destination is a struct sockaddr field with a 14-byte buffer, but the copy length derives from the network device hardware-address length. Device address lengths exceeding 14 bytes therefore write past sa_data. Although arp_flags is initialized after the copy, sufficiently large address lengths, such as MAX_ADDR_LEN, can overwrite arp_netmask, which may have been initialized by arp_ioctl(). The fix bounds the copy to the capacity of sa_data.
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Linux kernel ARP overflow vulnerability in arp_req_get().
Linux kernel ARP overflow vulnerability in arp_req_get().
Linux kernel ARP overflow vulnerability in arp_req_get().
Linux kernel ARP request handling overflow vulnerability.
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