CVE-2024-36938 (GCVE-0-2024-36938)
Vulnerability from cvelistv5
Published
2024-05-30 15:29
Modified
2026-05-11 20:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue Fix NULL pointer data-races in sk_psock_skb_ingress_enqueue() which syzbot reported [1]. [1] BUG: KCSAN: data-race in sk_psock_drop / sk_psock_skb_ingress_enqueue write to 0xffff88814b3278b8 of 8 bytes by task 10724 on cpu 1: sk_psock_stop_verdict net/core/skmsg.c:1257 [inline] sk_psock_drop+0x13e/0x1f0 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:459 [inline] sock_map_close+0x1a7/0x260 net/core/sock_map.c:1648 unix_release+0x4b/0x80 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0x68/0x150 net/socket.c:1421 __fput+0x2c1/0x660 fs/file_table.c:422 __fput_sync+0x44/0x60 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x101/0x1b0 fs/open.c:1541 __x64_sys_close+0x1f/0x30 fs/open.c:1541 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffff88814b3278b8 of 8 bytes by task 10713 on cpu 0: sk_psock_data_ready include/linux/skmsg.h:464 [inline] sk_psock_skb_ingress_enqueue+0x32d/0x390 net/core/skmsg.c:555 sk_psock_skb_ingress_self+0x185/0x1e0 net/core/skmsg.c:606 sk_psock_verdict_apply net/core/skmsg.c:1008 [inline] sk_psock_verdict_recv+0x3e4/0x4a0 net/core/skmsg.c:1202 unix_read_skb net/unix/af_unix.c:2546 [inline] unix_stream_read_skb+0x9e/0xf0 net/unix/af_unix.c:2682 sk_psock_verdict_data_ready+0x77/0x220 net/core/skmsg.c:1223 unix_stream_sendmsg+0x527/0x860 net/unix/af_unix.c:2339 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 ____sys_sendmsg+0x312/0x410 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x1e9/0x280 net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 value changed: 0xffffffff83d7feb0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10713 Comm: syz-executor.4 Tainted: G W 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Prior to this, commit 4cd12c6065df ("bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()") fixed one NULL pointer similarly due to no protection of saved_data_ready. Here is another different caller causing the same issue because of the same reason. So we should protect it with sk_callback_lock read lock because the writer side in the sk_psock_drop() uses "write_lock_bh(&sk->sk_callback_lock);". To avoid errors that could happen in future, I move those two pairs of lock into the sk_psock_data_ready(), which is suggested by John Fastabend.
References
Impacted products
Vendor Product Version
Linux Linux Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue\n\nFix NULL pointer data-races in sk_psock_skb_ingress_enqueue() which\nsyzbot reported [1].\n\n[1]\nBUG: KCSAN: data-race in sk_psock_drop / sk_psock_skb_ingress_enqueue\n\nwrite to 0xffff88814b3278b8 of 8 bytes by task 10724 on cpu 1:\n sk_psock_stop_verdict net/core/skmsg.c:1257 [inline]\n sk_psock_drop+0x13e/0x1f0 net/core/skmsg.c:843\n sk_psock_put include/linux/skmsg.h:459 [inline]\n sock_map_close+0x1a7/0x260 net/core/sock_map.c:1648\n unix_release+0x4b/0x80 net/unix/af_unix.c:1048\n __sock_release net/socket.c:659 [inline]\n sock_close+0x68/0x150 net/socket.c:1421\n __fput+0x2c1/0x660 fs/file_table.c:422\n __fput_sync+0x44/0x60 fs/file_table.c:507\n __do_sys_close fs/open.c:1556 [inline]\n __se_sys_close+0x101/0x1b0 fs/open.c:1541\n __x64_sys_close+0x1f/0x30 fs/open.c:1541\n do_syscall_64+0xd3/0x1d0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nread to 0xffff88814b3278b8 of 8 bytes by task 10713 on cpu 0:\n sk_psock_data_ready include/linux/skmsg.h:464 [inline]\n sk_psock_skb_ingress_enqueue+0x32d/0x390 net/core/skmsg.c:555\n sk_psock_skb_ingress_self+0x185/0x1e0 net/core/skmsg.c:606\n sk_psock_verdict_apply net/core/skmsg.c:1008 [inline]\n sk_psock_verdict_recv+0x3e4/0x4a0 net/core/skmsg.c:1202\n unix_read_skb net/unix/af_unix.c:2546 [inline]\n unix_stream_read_skb+0x9e/0xf0 net/unix/af_unix.c:2682\n sk_psock_verdict_data_ready+0x77/0x220 net/core/skmsg.c:1223\n unix_stream_sendmsg+0x527/0x860 net/unix/af_unix.c:2339\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x140/0x180 net/socket.c:745\n ____sys_sendmsg+0x312/0x410 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x1e9/0x280 net/socket.c:2667\n __do_sys_sendmsg net/socket.c:2676 [inline]\n __se_sys_sendmsg net/socket.c:2674 [inline]\n __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674\n do_syscall_64+0xd3/0x1d0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nvalue changed: 0xffffffff83d7feb0 -\u003e 0x0000000000000000\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 0 PID: 10713 Comm: syz-executor.4 Tainted: G        W          6.8.0-syzkaller-08951-gfe46a7dd189e #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024\n\nPrior to this, commit 4cd12c6065df (\"bpf, sockmap: Fix NULL pointer\ndereference in sk_psock_verdict_data_ready()\") fixed one NULL pointer\nsimilarly due to no protection of saved_data_ready. Here is another\ndifferent caller causing the same issue because of the same reason. So\nwe should protect it with sk_callback_lock read lock because the writer\nside in the sk_psock_drop() uses \"write_lock_bh(\u0026sk-\u003esk_callback_lock);\".\n\nTo avoid errors that could happen in future, I move those two pairs of\nlock into the sk_psock_data_ready(), which is suggested by John Fastabend."
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        "dateUpdated": "2026-05-11T20:17:24.694Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c0809c128dad4c3413818384eb06a341633db973"
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          "url": "https://git.kernel.org/stable/c/5965bc7535fb87510b724e5465ccc1a1cf00916d"
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36938",
    "datePublished": "2024-05-30T15:29:26.929Z",
    "dateReserved": "2024-05-30T15:25:07.071Z",
    "dateUpdated": "2026-05-11T20:17:24.694Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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