Vulnerability-Lookup

OESA-2021-1324 (CVE-2021-34556)

Vulnerability from osv_openeuler – Published: 2021-08-28 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.(CVE-2021-34556)

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.(CVE-2021-35477)

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11(CVE-2021-21781)

Severity

7.8 (High)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-34556	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-35477	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-21781	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-38160	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "kernel-debugsource-4.19.90-2108.8.0.0106.oe1.aarch64.rpm",
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          "type": "ECOSYSTEM"
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  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nIn the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.(CVE-2021-34556)\r\n\r\nIn the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.(CVE-2021-35477)\r\n\r\nAn information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process\u2019s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11(CVE-2021-21781)\r\n\r\nIn drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss can be triggered by an untrusted device that supplies a buf-\u0026gt;len value exceeding the buffer size.(CVE-2021-38160)",
  "id": "OESA-2021-1324",
  "modified": "2026-08-06T11:04:33Z",
  "published": "2021-08-28T11:04:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1324"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-34556"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-35477"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21781"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38160"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2021-34556",
    "CVE-2021-35477",
    "CVE-2021-21781",
    "CVE-2021-38160"
  ]
}

CVE-2021-21781 (GCVE-0-2021-21781)

Vulnerability from cvelistv5 – Published: 2021-08-18 14:37 – Updated: 2024-08-03 18:23

Summary

Severity

4 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

talos mitre root

References

2 references

URL	Tags
https://talosintelligence.com/vulnerability_repor…	x_refsource_MISC
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Linux Kernel	Affected: Linux Kernel v5.4.54, Linux Kernel v5.4.66

Show details on NVD website

JSON

To clipboard

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CVE-2021-34556 (GCVE-0-2021-34556)

Vulnerability from cvelistv5 – Published: 2021-08-02 04:02 – Updated: 2024-08-04 00:12

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

6 references

URL	Tags
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/08/01/3	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

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CVE-2021-35477 (GCVE-0-2021-35477)

Vulnerability from cvelistv5 – Published: 2021-08-02 03:57 – Updated: 2024-08-04 00:40

Summary

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

6 references

URL	Tags
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

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CVE-2021-38160 (GCVE-0-2021-38160)

Vulnerability from cvelistv5 – Published: 2021-08-07 03:31 – Updated: 2024-08-04 01:37 Disputed

Summary

In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE: the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the length validation was added solely for robustness in the face of anomalous host OS behavior

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

7 references

URL	Tags
https://github.com/torvalds/linux/commit/d00d8da5…	x_refsource_MISC
https://cdn.kernel.org/pub/linux/kernel/v5.x/Chan…	x_refsource_MISC
https://access.redhat.com/security/cve/cve-2021-38160	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021090…	x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-4978	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Show details on NVD website

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              "name": "https://access.redhat.com/security/cve/cve-2021-38160",
              "refsource": "MISC",
              "url": "https://access.redhat.com/security/cve/cve-2021-38160"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20210902-0010/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20210902-0010/"
            },
            {
              "name": "DSA-4978",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2021/dsa-4978"
            },
            {
              "name": "[debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html"
            },
            {
              "name": "[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-38160",
    "datePublished": "2021-08-07T03:31:12.000Z",
    "dateReserved": "2021-08-07T00:00:00.000Z",
    "dateUpdated": "2024-08-04T01:37:16.213Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2021-1324 (CVE-2021-34556)

CVE-2021-21781 (GCVE-0-2021-21781)

CVE-2021-34556 (GCVE-0-2021-34556)

CVE-2021-35477 (GCVE-0-2021-35477)

CVE-2021-38160 (GCVE-0-2021-38160)

Tags

Sightings

Nomenclature

Related by attack behaviour