ghsa-3v8f-wj9v-rfpm
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
io_uring: check for non-NULL file pointer in io_file_can_poll()
In earlier kernels, it was possible to trigger a NULL pointer dereference off the forced async preparation path, if no file had been assigned. The trace leading to that looks as follows:
BUG: kernel NULL pointer dereference, address: 00000000000000b0
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP
CPU: 67 PID: 1633 Comm: buf-ring-invali Not tainted 6.8.0-rc3+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 2/2/2022
RIP: 0010:io_buffer_select+0xc3/0x210
Code: 00 00 48 39 d1 0f 82 ae 00 00 00 48 81 4b 48 00 00 01 00 48 89 73 70 0f b7 50 0c 66 89 53 42 85 ed 0f 85 d2 00 00 00 48 8b 13 <48> 8b 92 b0 00 00 00 48 83 7a 40 00 0f 84 21 01 00 00 4c 8b 20 5b
RSP: 0018:ffffb7bec38c7d88 EFLAGS: 00010246
RAX: ffff97af2be61000 RBX: ffff97af234f1700 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffff97aecfb04820 RDI: ffff97af234f1700
RBP: 0000000000000000 R08: 0000000000200030 R09: 0000000000000020
R10: ffffb7bec38c7dc8 R11: 000000000000c000 R12: ffffb7bec38c7db8
R13: ffff97aecfb05800 R14: ffff97aecfb05800 R15: ffff97af2be5e000
FS: 00007f852f74b740(0000) GS:ffff97b1eeec0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 000000016deab005 CR4: 0000000000370ef0
Call Trace:
because the request is marked forced ASYNC and has a bad file fd, and hence takes the forced async prep path.
Current kernels with the request async prep cleaned up can no longer hit this issue, but for ease of backporting, let's add this safety check in here too as it really doesn't hurt. For both cases, this will inevitably end with a CQE posted with -EBADF.
{
"affected": [],
"aliases": [
"CVE-2024-39371"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-06-25T15:15:14Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: check for non-NULL file pointer in io_file_can_poll()\n\nIn earlier kernels, it was possible to trigger a NULL pointer\ndereference off the forced async preparation path, if no file had\nbeen assigned. The trace leading to that looks as follows:\n\nBUG: kernel NULL pointer dereference, address: 00000000000000b0\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP\nCPU: 67 PID: 1633 Comm: buf-ring-invali Not tainted 6.8.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 2/2/2022\nRIP: 0010:io_buffer_select+0xc3/0x210\nCode: 00 00 48 39 d1 0f 82 ae 00 00 00 48 81 4b 48 00 00 01 00 48 89 73 70 0f b7 50 0c 66 89 53 42 85 ed 0f 85 d2 00 00 00 48 8b 13 \u003c48\u003e 8b 92 b0 00 00 00 48 83 7a 40 00 0f 84 21 01 00 00 4c 8b 20 5b\nRSP: 0018:ffffb7bec38c7d88 EFLAGS: 00010246\nRAX: ffff97af2be61000 RBX: ffff97af234f1700 RCX: 0000000000000040\nRDX: 0000000000000000 RSI: ffff97aecfb04820 RDI: ffff97af234f1700\nRBP: 0000000000000000 R08: 0000000000200030 R09: 0000000000000020\nR10: ffffb7bec38c7dc8 R11: 000000000000c000 R12: ffffb7bec38c7db8\nR13: ffff97aecfb05800 R14: ffff97aecfb05800 R15: ffff97af2be5e000\nFS: 00007f852f74b740(0000) GS:ffff97b1eeec0000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00000000000000b0 CR3: 000000016deab005 CR4: 0000000000370ef0\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x1f/0x60\n ? page_fault_oops+0x14d/0x420\n ? do_user_addr_fault+0x61/0x6a0\n ? exc_page_fault+0x6c/0x150\n ? asm_exc_page_fault+0x22/0x30\n ? io_buffer_select+0xc3/0x210\n __io_import_iovec+0xb5/0x120\n io_readv_prep_async+0x36/0x70\n io_queue_sqe_fallback+0x20/0x260\n io_submit_sqes+0x314/0x630\n __do_sys_io_uring_enter+0x339/0xbc0\n ? __do_sys_io_uring_register+0x11b/0xc50\n ? vm_mmap_pgoff+0xce/0x160\n do_syscall_64+0x5f/0x180\n entry_SYSCALL_64_after_hwframe+0x46/0x4e\nRIP: 0033:0x55e0a110a67e\nCode: ba cc 00 00 00 45 31 c0 44 0f b6 92 d0 00 00 00 31 d2 41 b9 08 00 00 00 41 83 e2 01 41 c1 e2 04 41 09 c2 b8 aa 01 00 00 0f 05 \u003cc3\u003e 90 89 30 eb a9 0f 1f 40 00 48 8b 42 20 8b 00 a8 06 75 af 85 f6\n\nbecause the request is marked forced ASYNC and has a bad file fd, and\nhence takes the forced async prep path.\n\nCurrent kernels with the request async prep cleaned up can no longer hit\nthis issue, but for ease of backporting, let\u0027s add this safety check in\nhere too as it really doesn\u0027t hurt. For both cases, this will inevitably\nend with a CQE posted with -EBADF.",
"id": "GHSA-3v8f-wj9v-rfpm",
"modified": "2024-08-19T21:35:07Z",
"published": "2024-06-25T15:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39371"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/43cfac7b88adedfb26c27834386992650f1642f3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5fc16fa5f13b3c06fdb959ef262050bd810416a2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/65561b4c1c9e01443cb76387eb36a9109e7048ee"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c2844d5e58576c55d8e8d4a9f74902d3f7be8044"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date |
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