CVE-2022-49153

wireguard: socket: free skb in send6 when ipv6 is disabled

State: Published
Severity: 5.5 Medium
Published: Feb 26, 2025
Updated: May 11, 2026
Reserved: Feb 26, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

wireguard: socket: free skb in send6 when ipv6 is disabled

I got a memory leak report:

unreferenced object 0xffff8881191fc040 (size 232): comm "kworker/u17:0", pid 23193, jiffies 4295238848 (age 3464.870s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff814c3ef4>] slab_post_alloc_hook+0x84/0x3b0 [<ffffffff814c8977>] kmem_cache_alloc_node+0x167/0x340 [<ffffffff832974fb>] __alloc_skb+0x1db/0x200 [<ffffffff82612b5d>] wg_socket_send_buffer_to_peer+0x3d/0xc0 [<ffffffff8260e94a>] wg_packet_send_handshake_initiation+0xfa/0x110 [<ffffffff8260ec81>] wg_packet_handshake_send_worker+0x21/0x30 [<ffffffff8119c558>] process_one_work+0x2e8/0x770 [<ffffffff8119ca2a>] worker_thread+0x4a/0x4b0 [<ffffffff811a88e0>] kthread+0x120/0x160 [<ffffffff8100242f>] ret_from_fork+0x1f/0x30

In function wg_socket_send_buffer_as_reply_to_skb() or wg_socket_send_ buffer_to_peer(), the semantics of send6() is required to free skb. But when CONFIG_IPV6 is disable, kfree_skb() is missing. This patch adds it to fix this bug.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-401 Missing Release of Memory after Effective Lifetime

Affected Products

Product	Versions
LinuxLinux	e7096c131e5161fa3b8e52a650d7719d2857adfd to before 096f9d35cac0a0c95ffafc00db84786b665a4837Affected e7096c131e5161fa3b8e52a650d7719d2857adfd to before 402991a9771587acc2947cf6c4d689c5397f2258Affected e7096c131e5161fa3b8e52a650d7719d2857adfd to before ebcc492f4ba14bae54b898f1016a37b4282558d1Affected e7096c131e5161fa3b8e52a650d7719d2857adfd to before 0b19bcb753dbfb74710d12bb2761ec5ed706c726Affected e7096c131e5161fa3b8e52a650d7719d2857adfd to before bbbf962d9460194993ee1943a793a0a0af4a7fbfAffected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.110 through 5.10.Not affected 5.15.33 through 5.15.Not affected 5.16.19 through 5.16.Not affected 5.17.2 through 5.17.Not affected 5.18 and laterNot affected

Product

Versions

LinuxLinux

e7096c131e5161fa3b8e52a650d7719d2857adfd to before 096f9d35cac0a0c95ffafc00db84786b665a4837Affected
e7096c131e5161fa3b8e52a650d7719d2857adfd to before 402991a9771587acc2947cf6c4d689c5397f2258Affected
e7096c131e5161fa3b8e52a650d7719d2857adfd to before ebcc492f4ba14bae54b898f1016a37b4282558d1Affected
e7096c131e5161fa3b8e52a650d7719d2857adfd to before 0b19bcb753dbfb74710d12bb2761ec5ed706c726Affected
e7096c131e5161fa3b8e52a650d7719d2857adfd to before bbbf962d9460194993ee1943a793a0a0af4a7fbfAffected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.110 through 5.10.*Not affected
5.15.33 through 5.15.*Not affected
5.16.19 through 5.16.*Not affected
5.17.2 through 5.17.*Not affected
5.18 and laterNot affected

References

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