Memory Management Issue in Linux Kernel Affects Multiple Networking Functions
CVE-2026-23001
What is CVE-2026-23001?
A vulnerability in the Linux kernel related to the macvlan networking implementation has been identified. This flaw may lead to a use-after-free condition in the macvlan_forward_source function, potentially allowing an attacker to exploit memory management issues within the kernel. The vulnerability arises if the macvlan_hash_del_source function doesn't correctly handle the clearing of the vlan pointer before the RCU grace period, allowing it to potentially skip over entries queued for freeing. This could impact the stability and security of network operations that rely on macvlan features.
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Affected Version(s)
Linux 79cf79abce71eb7dbc40e2f3121048ca5405cb47 < 8133e85b8a3ec9f10d861e0002ec6037256e987e
Linux 79cf79abce71eb7dbc40e2f3121048ca5405cb47 < 484919832e2db6ce1e8add92c469e5d459a516b5
Linux 79cf79abce71eb7dbc40e2f3121048ca5405cb47 < 232afc74a6dde0fe1830988e5827921f5ec9bb3f