Vulnerability-Lookup

SUSE-SU-2021:1251-1

Vulnerability from csaf_suse - Published: 2021-04-19 06:58 - Updated: 2026-09-20 13:53

Summary

Security update for xen

Severity

Important

Notes

Title of the patch: Security update for xen

Description of the patch: This update for xen fixes the following issues: - CVE-2021-27379: Fixed an issue where entries in the IOMMU were not being updated under certain circumstances due to improper backport of XSA-321 (XSA-366, bsc#1182431) - CVE-2021-20257: Fixed an infinite loop in the e1000 NIC emulator (bsc#1182846)

Patchnames: SUSE-2021-1251,SUSE-OpenStack-Cloud-9-2021-1251,SUSE-OpenStack-Cloud-Crowbar-9-2021-1251,SUSE-SLE-SAP-12-SP4-2021-1251,SUSE-SLE-SERVER-12-SP4-LTSS-2021-1251

CVE-2021-20257

3.2 (Low)


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

Affected products

Recommended 36 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP4:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4-LTSS:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP4:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP4:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud 9:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-doc-html-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-libs-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-libs-32bit-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-tools-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE OpenStack Cloud Crowbar 9:xen-tools-domU-0:4.11.4_16-2.51.1.x86_64	—	Vendor Fix

Threats

Impact low

CVE-2021-27379

7.9 (High)


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

Affected products

Recommended 36 products, the same list as for CVE-2021-20257

Threats

Impact important

References

14 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1178591	self
https://bugzilla.suse.com/1182431	self
https://bugzilla.suse.com/1182846	self
https://www.suse.com/security/cve/CVE-2021-20257/	self
https://www.suse.com/security/cve/CVE-2021-27379/	self
https://www.suse.com/security/cve/CVE-2021-20257	external
https://bugzilla.suse.com/1182577	external
https://bugzilla.suse.com/1182846	external
https://www.suse.com/security/cve/CVE-2021-27379	external
https://bugzilla.suse.com/1182431	external

JSON

To clipboard

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          "text": "An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
          "title": "CVE description"
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      "references": [
        {
          "category": "external",
          "summary": "CVE-2021-20257",
          "url": "https://www.suse.com/security/cve/CVE-2021-20257"
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          "category": "external",
          "summary": "SUSE Bug 1182577 for CVE-2021-20257",
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          "category": "external",
          "summary": "SUSE Bug 1182846 for CVE-2021-20257",
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      "scores": [
        {
          "cvss_v3": {
            "baseScore": 3.2,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "date": "2021-04-19T06:58:14Z",
          "details": "low"
        }
      ],
      "title": "CVE-2021-20257"
    },
    {
      "cve": "CVE-2021-27379",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2021-27379"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.",
          "title": "CVE description"
        }
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          "category": "impact",
          "date": "2021-04-19T06:58:14Z",
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}

CVE-2021-20257 (GCVE-0-2021-20257)

Vulnerability from cvelistv5 – Published: 2022-03-16 14:12 – Updated: 2024-08-03 17:37

Summary

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Severity

No CVSS data available.

CWE

CWE-835

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1045 records in the last 180 days details

References

7 references

URL	Tags
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
https://lists.gnu.org/archive/html/qemu-devel/202…	x_refsource_MISC
https://github.com/qemu/qemu/commit/3de46e6fc489c…	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=1930087	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2022042…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-27	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	QEMU	Affected: Fixed-In v6.2.0

Show details on NVD website

JSON

To clipboard

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CVE-2021-27379 (GCVE-0-2021-27379)

Vulnerability from cvelistv5 – Published: 2021-02-18 15:05 – Updated: 2024-08-03 20:48

Summary

An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2362 records in the last 180 days details

References

4 references

URL	Tags
http://xenbits.xen.org/xsa/advisory-366.html	x_refsource_CONFIRM
https://xenbits.xen.org/xsa/advisory-366.html	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/02/23/1	mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4888	vendor-advisoryx_refsource_DEBIAN

Show details on NVD website

JSON

To clipboard

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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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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.

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SUSE-SU-2021:1251-1

CVE-2021-20257 (GCVE-0-2021-20257)

CVE-2021-27379 (GCVE-0-2021-27379)

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Nomenclature

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