cnvd - cnvd-2018-20467

cnvd-2018-20467

Vulnerability from cnvd

Title: Linux kernel KVM拒绝服务漏洞（CNVD-2018-20467）

Description:

Linux kernel是美国Linux基金会发布的操作系统Linux所使用的内核。KVM是其中的一个基于内核的虚拟机。

基于arm64平台的Linux kernel 4.18.12之前版本中的KVM的t.c文件存在安全漏洞，该漏洞源于程序未能充分的执行访问限制并且PSTATE.M检测机制没有阻止非预期的执行状态。攻击者可利用该漏洞重定向虚拟机监视器的控制流或造成拒绝服务。

Severity: 中

Patch Name: Linux kernel KVM拒绝服务漏洞（CNVD-2018-20467）的补丁

Patch Description:

Linux kernel是美国Linux基金会发布的操作系统Linux所使用的内核。KVM是其中的一个基于内核的虚拟机。

基于arm64平台的Linux kernel 4.18.12之前版本中的KVM的t.c文件存在安全漏洞，该漏洞源于程序未能充分的执行访问限制并且PSTATE.M检测机制没有阻止非预期的执行状态。攻击者可利用该漏洞重定向虚拟机监视器的控制流或造成拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description:

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d

Reference: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12 https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279 https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d https://www.openwall.com/lists/oss-security/2018/10/02/2

Impacted products

Name
Linux kernel <4.18.12

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-18021"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u53d1\u5e03\u7684\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002KVM\u662f\u5176\u4e2d\u7684\u4e00\u4e2a\u57fa\u4e8e\u5185\u6838\u7684\u865a\u62df\u673a\u3002\r\n\r\n\u57fa\u4e8earm64\u5e73\u53f0\u7684Linux kernel 4.18.12\u4e4b\u524d\u7248\u672c\u4e2d\u7684KVM\u7684t.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u5145\u5206\u7684\u6267\u884c\u8bbf\u95ee\u9650\u5236\u5e76\u4e14PSTATE.M\u68c0\u6d4b\u673a\u5236\u6ca1\u6709\u963b\u6b62\u975e\u9884\u671f\u7684\u6267\u884c\u72b6\u6001\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u91cd\u5b9a\u5411\u865a\u62df\u673a\u76d1\u89c6\u5668\u7684\u63a7\u5236\u6d41\u6216\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002",
  "discovererName": "unKnow",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-20467",
  "openTime": "2018-10-10",
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  "patchName": "Linux kernel KVM\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-20467\uff09\u7684\u8865\u4e01",
  "products": {
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  "serverity": "\u4e2d",
  "submitTime": "2018-10-10",
  "title": "Linux kernel KVM\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-20467\uff09"
}

CVE-2018-18021 (GCVE-0-2018-18021)

Vulnerability from cvelistv5

Published

2018-10-07 06:00

Modified

2024-08-05 11:01

Severity ?

CWE

Summary

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

References

▼	URL	Tags
	https://usn.ubuntu.com/3821-1/	vendor-advisory, x_refsource_UBUNTU
	https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2018/10/02/2	x_refsource_MISC
	https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12	x_refsource_MISC
	https://access.redhat.com/errata/RHSA-2018:3656	vendor-advisory, x_refsource_REDHAT
	https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d	x_refsource_MISC
	http://www.securityfocus.com/bid/105550	vdb-entry, x_refsource_BID
	https://usn.ubuntu.com/3821-2/	vendor-advisory, x_refsource_UBUNTU
	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279	x_refsource_MISC
	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692d	x_refsource_MISC
	https://www.debian.org/security/2018/dsa-4313	vendor-advisory, x_refsource_DEBIAN
	https://usn.ubuntu.com/3931-1/	vendor-advisory, x_refsource_UBUNTU
	https://usn.ubuntu.com/3931-2/	vendor-advisory, x_refsource_UBUNTU

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

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    "dateUpdated": "2024-08-05T11:01:14.808Z",
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  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted