Vulnerability-Lookup

CNVD-2021-54394

Vulnerability from cnvd - Published: 2021-07-23

Title

Linux kernel MAX_RW_COUNT缓冲区溢出漏洞

Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel MAX_RW_COUNT存在缓冲区溢出漏洞。攻击者可以通过Linux内核的MAX_RW_COUNT触发缓冲区溢出，以触发拒绝服务，并可能运行代码。

Severity

高

Patch Name

Linux kernel MAX_RW_COUNT缓冲区溢出漏洞的补丁

Patch Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel MAX_RW_COUNT存在缓冲区溢出漏洞。攻击者可以通过Linux内核的MAX_RW_COUNT触发缓冲区溢出，以触发拒绝服务，并可能运行代码。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://ubuntu.com/security/CVE-2021-3491

Reference

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db

Impacted products

Name
Linux Kernel

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-3491",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-3491"
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  "number": "CNVD-2021-54394",
  "openTime": "2021-07-23",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel  MAX_RW_COUNT\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u4ee5\u901a\u8fc7Linux\u5185\u6838\u7684MAX_RW_COUNT\u89e6\u53d1\u7f13\u51b2\u533a\u6ea2\u51fa\uff0c\u4ee5\u89e6\u53d1\u62d2\u7edd\u670d\u52a1\uff0c\u5e76\u53ef\u80fd\u8fd0\u884c\u4ee3\u7801\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
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  "products": {
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  "serverity": "\u9ad8",
  "submitTime": "2021-07-16",
  "title": "Linux kernel MAX_RW_COUNT\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2021-3491 (GCVE-0-2021-3491)

Vulnerability from cvelistv5 – Published: 2021-06-04 01:40 – Updated: 2024-09-16 22:09

Title

Linux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass

Summary

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-131 - Incorrect Calculation of Buffer Size

Assigner

canonical mitre root Scorecard

References

6 references

URL	Tags
https://ubuntu.com/security/notices/USN-4950-1	vendor-advisoryx_refsource_UBUNTU
https://ubuntu.com/security/notices/USN-4949-1	vendor-advisoryx_refsource_UBUNTU
https://www.openwall.com/lists/oss-security/2021/…	mailing-listx_refsource_MLIST
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://www.zerodayinitiative.com/advisories/ZDI-…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021071…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Linux	Linux kernel	Affected: trunk , < v5.13-rc4 (custom) Affected: linux-5.12.y , < v5.12.4 (custom) Affected: linux-5.11.y , < v5.11.21 (custom) Affected: linux-5.10.y , < v5.10.37 (custom) Affected: v5.7-rc1 , < 5.7* (custom)

Date Public

2021-05-11 00:00

Credits

Billy Jheng Bing-Jhong (@st424204) of STAR Labs working with Trend Micro's Zero Day Initiative

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CNVD-2021-54394

CVE-2021-3491 (GCVE-0-2021-3491)

Tags

Sightings

Nomenclature

Related by attack behaviour