CVE-2024-26731
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,…
Does this matter?
Lower severity and a low EPSS score (0.83%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 0.83% probability · 55th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54Patch
- https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8Patch
- https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26Patch
- https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949Patch
- https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54Patch
- https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8Patch
- https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26Patch
- https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.