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cvelist/2021/47xxx/CVE-2021-47566.json

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"-Synchronized-Data."
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{
"data_version": "4.0",
"data_type": "CVE",
"data_format": "MITRE",
"CVE_data_meta": {
"ID": "CVE-2021-47566",
"ASSIGNER": "cve@kernel.org",
"STATE": "PUBLIC"
},
"description": {
"description_data": [
{
"lang": "eng",
"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."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"affects": {
"vendor": {
"vendor_data": [
{
"vendor_name": "Linux",
"product": {
"product_data": [
{
"product_name": "Linux",
"version": {
"version_data": [
{
"version_affected": "<",
"version_name": "997c136f518c",
"version_value": "a9e164bd160b"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
"versions": [
{
"version": "3.0",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.0",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.4.294",
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.292",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.257",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.219",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.163",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.83",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.6",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
],
"defaultStatus": "affected"
}
}
]
}
}
]
}
}
]
}
},
"references": {
"reference_data": [
{
"url": "https://git.kernel.org/stable/c/a9e164bd160be8cbee1df70acb379129e3cd2e7c",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/a9e164bd160be8cbee1df70acb379129e3cd2e7c"
},
{
"url": "https://git.kernel.org/stable/c/33a7d698f30fa0b99d50569e9909d3baa65d8f6a",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/33a7d698f30fa0b99d50569e9909d3baa65d8f6a"
},
{
"url": "https://git.kernel.org/stable/c/99d348b82bcb36171f24411d3f1a15706a2a937a",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/99d348b82bcb36171f24411d3f1a15706a2a937a"
},
{
"url": "https://git.kernel.org/stable/c/9ef384ed300d1bcfb23d0ab0b487d544444d4b52",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/9ef384ed300d1bcfb23d0ab0b487d544444d4b52"
},
{
"url": "https://git.kernel.org/stable/c/fd7974c547abfb03072a4ee706d3a6f182266f89",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/fd7974c547abfb03072a4ee706d3a6f182266f89"
},
{
"url": "https://git.kernel.org/stable/c/a8a917058faf4abaec9fb614bb6d5f8fe3529ec6",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/a8a917058faf4abaec9fb614bb6d5f8fe3529ec6"
},
{
"url": "https://git.kernel.org/stable/c/7b3a34f08d11e7f05cd00b8e09adaa15192f0ad1",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/7b3a34f08d11e7f05cd00b8e09adaa15192f0ad1"
},
{
"url": "https://git.kernel.org/stable/c/c1e63117711977cc4295b2ce73de29dd17066c82",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/c1e63117711977cc4295b2ce73de29dd17066c82"
}
]
},
"generator": {
"-Synchronized-Data."
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"engine": "bippy-a5840b7849dd"
"-Synchronized-Data."
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}
}
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