cve-2024-26731
Vulnerability from cvelistv5
Published
2024-04-03 17:00
Modified
2024-12-19 08:46
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4588b13abcbd561ec67f5b3c1cb2eff690990a54
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9b099ed46dcaf1403c531ff02c3d7400fa37fa26
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949
Impacted products
Vendor Product Version
Linux Linux Version: dd628fc697ee59b76bd3877c4bd13f07ccc3776f
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
Version: 6df7f764cd3cf5a03a4a47b23be47e57e41fcd85
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   Linux Linux Version: 6.4
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\"https://git.kernel.org/stable/c/d61608a4e394f23e0dca099df9eb8e555453d949\"}, {\"url\": \"https://git.kernel.org/stable/c/4cd12c6065dfcdeba10f49949bffcf383b3952d8\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:46:03.323Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26731\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:46:03.323Z\", \"dateReserved\": \"2024-02-19T14:20:24.164Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T17:00:18.823Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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