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cve/2025/CVE-2025-21683.md
0xMarcio cb00e1339f Update CVE list 2025-09-29 21:09
2025-09-29 21:09:30 +02:00

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CVE-2025-21683

Description

In the Linux kernel, the following vulnerability has been resolved:bpf: Fix bpf_sk_select_reuseport() memory leakAs pointed out in the original comment, lookup in sockmap can return a TCPESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPFset before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cbdoes not imply a non-refcounted socket.Drop sk's reference in both error paths.unreferenced object 0xffff888101911800 (size 2048): comm "test_progs", pid 44109, jiffies 4297131437 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e

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