{"id":"CVE-2026-99138","published":"2026-10-28T11:17:33.740","lastModified":"2026-10-28T11:17:33.740","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)\n\ndo_tcp_getsockopt() reads icsk->icsk_ca_ops and dereferences the\nget_info function pointer without rcu_read_lock(). With BPF struct_ops\ncongestion control, ca_ops can point to dynamically allocated memory\nthat is freed concurrently, resulting in a use-after-free when the\nkernel dereferences or calls through the stale pointer.\n\n  BUG: KASAN: slab-use-after-free in do_tcp_getsockopt+0x2037/0x23e0\n  Read of size 8 at addr ffff888013701258 by task exploit/149\n   do_tcp_getsockopt+0x2037/0x23e0 (net/ipv4/tcp.c:4564)\n   tcp_getsockopt+0x91/0xf0\n   __sys_getsockopt+0xf7/0x170\n\nFix this by wrapping the ca_ops load and get_info call within\nrcu_read_lock()/rcu_read_unlock(), and using READ_ONCE() to load\nthe icsk_ca_ops pointer.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/385e474086c2e7e29e2dded690be40dc273e20ee","tags":[]},{"url":"https://git.kernel.org/stable/c/39aa489e85752f9de214edb0f85e4d578e57af29","tags":[]},{"url":"https://git.kernel.org/stable/c/86814e5370068ec2bf0caa6e6d55c3e5bfc6c324","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}