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PUBLISHED

CVE-2024-26731

bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-04

Description

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.

Product status

Default status
unaffected

dd628fc697ee before 4588b13abcbd
affected

6df7f764cd3c before 9b099ed46dca
affected

6df7f764cd3c before d61608a4e394
affected

6df7f764cd3c before 4cd12c6065df
affected

Default status
affected

6.4
affected

Any version before 6.4
unaffected

6.1.80
unaffected

6.6.19
unaffected

6.7.7
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54

https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26

https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949

https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8

cve.org CVE-2024-26731

nvd.nist.gov CVE-2024-26731

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