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TI-2021-09759 Aliases CVE-2021-28693GHSA-jpfw-vm34-2p3p

xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g.

Priority LOW 25Published · Updated

Key facts

Attack vector
Local
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

xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.

Why it matters now

EPSS 0.00321 25th percentileScored 2026-11-07
Fix Fixed xen (Xen): next of 4.14.x

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
Xenxen4.15.x—No fix listedCNA
Xenxen4.13.x and laternext of 4.14.xPatch availableCNA
Xenxenxen-unstable—No fix listedCNA
Xenxen4.12.x—No fix listedCNA
  • xen VendorXen Affected 4.15.x Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.13.x and later Fixed in next of 4.14.x Patch available CNA
  • xen VendorXen Affected xen-unstable Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.12.x Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*4.12.0 – 4.15.0VulnerableXen
cpe:2.3:o:xen:xen:4.15.0:rc1:*:*:*:*:*:*4.15.0 rc1VulnerableXen
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions 4.12.0 – 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 4.14.x

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-2021-28693
  2. 2026-10-03 Alias added: GHSA-jpfw-vm34-2p3p

References

Advisory 2

  • 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