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CVE-2024-41041 is a race condition in the Linux kernel's UDP socket handling. In udp_lib_get_port(), a bound socket is inserted into the UDP hash table before SOCK_RCU_FREE is set. Concurrent udp_v4_early_demux(), udp_v6_early_demux(), or sk_lookup() operations can therefore encounter the socket before its RCU lifetime protection is established. These lookup paths access sockets without incrementing their reference counts and use sock_pfree() as the packet-buffer destructor. Syzkaller reproduced a kernel warning in udp_v4_early_demux(). The fix sets SOCK_RCU_FREE before publishing the socket in the hash table.
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A race condition in Linux kernel UDP socket handling occurs because SOCK_RCU_FREE is set after a bound socket is inserted into the hash table. Concurrent socket lookups can encounter the socket before this flag is set, undermining RCU lifetime-safety checks and triggering a kernel warning. The listed CVSS v3 score is 5.5, indicating a local, low-privilege vulnerability with high availability impact and no confidentiality or integrity impact.
Linux kernel vulnerability covered by the security update.
Linux kernel UDP socket-lifecycle issue in udp_lib_get_port(), addressed by earlier setting of SOCK_RCU_FREE.
Linux kernel UDP lifecycle issue addressed by setting SOCK_RCU_FREE earlier in udp_lib_get_port().
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