ghsa-x96q-4pr8-5qm2
Vulnerability from github
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:
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.
{ "affected": [], "aliases": [ "CVE-2024-26731" ], "database_specific": { "cwe_ids": [ "CWE-476" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-04-03T17:15:50Z", "severity": "MODERATE" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()\n\nsyzbot reported the following NULL pointer dereference issue [1]:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n [...]\n RIP: 0010:0x0\n [...]\n Call Trace:\n \u003cTASK\u003e\n sk_psock_verdict_data_ready+0x232/0x340 net/core/skmsg.c:1230\n unix_stream_sendmsg+0x9b4/0x1230 net/unix/af_unix.c:2293\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nIf sk_psock_verdict_data_ready() and sk_psock_stop_verdict() are called\nconcurrently, psock-\u003esaved_data_ready can be NULL, causing the above issue.\n\nThis patch fixes this issue by calling the appropriate data ready function\nusing the sk_psock_data_ready() helper and protecting it from concurrency\nwith sk-\u003esk_callback_lock.", "id": "GHSA-x96q-4pr8-5qm2", "modified": "2024-11-07T00:30:35Z", "published": "2024-04-03T18:30:41Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26731" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "type": "CVSS_V3" } ] }
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.