cnvd - cnvd-2021-22866

cnvd-2021-22866

Vulnerability from cnvd

Title: Linux kernel信息泄露漏洞（CNVD-2021-22866）

Description:

Linux kernel是一种计算机操作系统内核，以C语言和汇编语言写成，符合POSIX标准，按GNU通用公共许可证发行。

Linux kernel 5.11.8之前版本中的kernel/bpf/verifier.c存在信息泄露漏洞。攻击者可利用该漏洞进行侧通道攻击并使Spectre缓解措施无效，从而可从内核内存中获取敏感信息。

Severity: 低

Formal description:

厂商尚未提供漏洞修复方案，请关注厂商主页更新： https://www.kernel.org/

Reference: https://nvd.nist.gov/vuln/detail/CVE-2020-27170

Impacted products

Name
Linux Linux kernel <5.11.8

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-27170",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-27170"
    }
  },
  "description": "Linux kernel\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u4ee5C\u8bed\u8a00\u548c\u6c47\u7f16\u8bed\u8a00\u5199\u6210\uff0c\u7b26\u5408POSIX\u6807\u51c6\uff0c\u6309GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\u53d1\u884c\u3002\n\nLinux kernel 5.11.8\u4e4b\u524d\u7248\u672c\u4e2d\u7684kernel/bpf/verifier.c\u5b58\u5728\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u8fdb\u884c\u4fa7\u901a\u9053\u653b\u51fb\u5e76\u4f7fSpectre\u7f13\u89e3\u63aa\u65bd\u65e0\u6548\uff0c\u4ece\u800c\u53ef\u4ece\u5185\u6838\u5185\u5b58\u4e2d\u83b7\u53d6\u654f\u611f\u4fe1\u606f\u3002",
  "formalWay": "\u5382\u5546\u5c1a\u672a\u63d0\u4f9b\u6f0f\u6d1e\u4fee\u590d\u65b9\u6848\uff0c\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\u66f4\u65b0\uff1a\r\nhttps://www.kernel.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-22866",
  "openTime": "2021-03-26",
  "products": {
    "product": "Linux  Linux kernel \u003c5.11.8"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-27170",
  "serverity": "\u4f4e",
  "submitTime": "2021-03-22",
  "title": "Linux kernel\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2021-22866\uff09"
}

CVE-2020-27170 (GCVE-0-2020-27170)

Vulnerability from cvelistv5

Published

2021-03-20 21:30

Modified

2024-08-04 16:11

Severity ?

CWE

Summary

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.

References

▼	URL	Tags
	https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2021/03/19/2	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/	vendor-advisory, x_refsource_FEDORA
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/	vendor-advisory, x_refsource_FEDORA
	http://www.openwall.com/lists/oss-security/2021/03/24/4	mailing-list, x_refsource_MLIST
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html	mailing-list, x_refsource_MLIST
	http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html	x_refsource_MISC

Impacted products

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

Show details on NVD website

JSON

To clipboard

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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.

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