CVE-2024-26731 (GCVE-0-2024-26731)
Vulnerability from cvelistv5
Published
2024-04-03 17:00
Modified
2026-05-23 15:37
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready() syzbot reported the following NULL pointer dereference issue [1]: BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] RIP: 0010:0x0 [...] Call Trace: <TASK> sk_psock_verdict_data_ready+0x232/0x340 net/core/skmsg.c:1230 unix_stream_sendmsg+0x9b4/0x1230 net/unix/af_unix.c:2293 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 If sk_psock_verdict_data_ready() and sk_psock_stop_verdict() are called concurrently, psock->saved_data_ready can be NULL, causing the above issue. This patch fixes this issue by calling the appropriate data ready function using the sk_psock_data_ready() helper and protecting it from concurrency with sk->sk_callback_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: dd628fc697ee59b76bd3877c4bd13f07ccc3776f
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
Version: d3cbd7c571446a876aefd8320500300b2c951c58
Version: 6.1.32   ≤
Version: 6.3.6   ≤
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