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TI-2021-09756 Aliases CVE-2021-28690GHSA-7qwx-5h4j-5c9w

x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX…

Priority LOW 31Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. Mitigating TAA by disabling TSX (the default and preferred option) requires selecting a non-default setting in MSR_TSX_CTRL. This setting isn't restored after S3 suspend.

Why it matters now

EPSS 0.00991 62nd percentileScored 2026-11-07
Fix Fixed xen (Xen): next of xen-unstable

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Xenxen4.13.x and laternext of xen-unstablePatch availableCNA
Xenxen4.12.x—No fix listedCNA
Xenxen4.11.x—No fix listedCNA
  • xen VendorXen Affected 4.13.x and later Fixed in next of xen-unstable Patch available CNA
  • xen VendorXen Affected 4.12.x Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.11.x Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*4.12 – 4.15.0VulnerableXen
cpe:2.3:o:xen:xen:4.15.0:rc1:*:*:*:*:*:*4.15.0 rc1VulnerableXen
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions 4.12 – 4.15.0 Vulnerable ·Xen
  • cpe:2.3:o:xen:xen:4.15.0:rc1:*:*:*:*:*:* Versions 4.15.0 rc1 Vulnerable ·Xen

Remediation

  • Fix · CNA xen (Xen) Fixed in next of xen-unstable

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28690
  2. 2026-10-03 Alias added: GHSA-7qwx-5h4j-5c9w

References

Patch 1

Advisory 1

  • TI-2012-00210 The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix… CVSS 2.0HIGH 7.2
  • TI-2023-07042 Information disclosure through error messages in AMD Ryzen™ 3000 Series Desktop… CVSS 3.1MEDIUM 5.5
  • TI-2015-04333 The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used… CVSS 2.0HIGH 9.3
  • TI-2015-06741 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows… CVSS 3.1CRITICAL 10.0
  • TI-2018-06436 A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures… CVSS 3.0HIGH 7.8
  • TI-2024-20522 x86: Incorrect logic for BTC/SRSO mitigations CVSS 3.1HIGH 7.5
See all 489 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences