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vuln-cve/data/2021/47xxx/CVE-2021-47566.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2021-47566",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-24T15:11:00.728Z",
"datePublished": "2024-05-24T15:12:53.432Z",
"dateUpdated": "2026-05-11T13:57:06.193Z"
},
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"shortName": "Linux",
"dateUpdated": "2026-05-11T13:57:06.193Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nproc/vmcore: fix clearing user buffer by properly using clear_user()\n\nTo clear a user buffer we cannot simply use memset, we have to use\nclear_user(). With a virtio-mem device that registers a vmcore_cb and\nhas some logically unplugged memory inside an added Linux memory block,\nI can easily trigger a BUG by copying the vmcore via \"cp\":\n\n systemd[1]: Starting Kdump Vmcore Save Service...\n kdump[420]: Kdump is using the default log level(3).\n kdump[453]: saving to /sysroot/var/crash/127.0.0.1-2021-11-11-14:59:22/\n kdump[458]: saving vmcore-dmesg.txt to /sysroot/var/crash/127.0.0.1-2021-11-11-14:59:22/\n kdump[465]: saving vmcore-dmesg.txt complete\n kdump[467]: saving vmcore\n BUG: unable to handle page fault for address: 00007f2374e01000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0003) - permissions violation\n PGD 7a523067 P4D 7a523067 PUD 7a528067 PMD 7a525067 PTE 800000007048f867\n Oops: 0003 [#1] PREEMPT SMP NOPTI\n CPU: 0 PID: 468 Comm: cp Not tainted 5.15.0+ #6\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.14.0-27-g64f37cc530f1-prebuilt.qemu.org 04/01/2014\n RIP: 0010:read_from_oldmem.part.0.cold+0x1d/0x86\n Code: ff ff ff e8 05 ff fe ff e9 b9 e9 7f ff 48 89 de 48 c7 c7 38 3b 60 82 e8 f1 fe fe ff 83 fd 08 72 3c 49 8d 7d 08 4c 89 e9 89 e8 <49> c7 45 00 00 00 00 00 49 c7 44 05 f8 00 00 00 00 48 83 e7 f81\n RSP: 0018:ffffc9000073be08 EFLAGS: 00010212\n RAX: 0000000000001000 RBX: 00000000002fd000 RCX: 00007f2374e01000\n RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 00007f2374e01008\n RBP: 0000000000001000 R08: 0000000000000000 R09: ffffc9000073bc50\n R10: ffffc9000073bc48 R11: ffffffff829461a8 R12: 000000000000f000\n R13: 00007f2374e01000 R14: 0000000000000000 R15: ffff88807bd421e8\n FS: 00007f2374e12140(0000) GS:ffff88807f000000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f2374e01000 CR3: 000000007a4aa000 CR4: 0000000000350eb0\n Call Trace:\n read_vmcore+0x236/0x2c0\n proc_reg_read+0x55/0xa0\n vfs_read+0x95/0x190\n ksys_read+0x4f/0xc0\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nSome x86-64 CPUs have a CPU feature called \"Supervisor Mode Access\nPrevention (SMAP)\", which is used to detect wrong access from the kernel\nto user buffers like this: SMAP triggers a permissions violation on\nwrong access. In the x86-64 variant of clear_user(), SMAP is properly\nhandled via clac()+stac().\n\nTo fix, properly use clear_user() when we're dealing with a user buffer."
}
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