CVE catalog

CVE-2021-28687

xen: CVE-2021-28687

[CVE catalog]

Severity
Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.31% · Oct 25, 2026

HVM soft-reset crashes toolstack libxl requires all data structures passed across its public interface to be initialized before use and disposed of afterwards by calling a specific set of functions. Many internal data structures also require this initialize / dispose discipline, but not all of them. When the "soft reset" feature was implemented, the libxl__domain_suspend_state structure didn't require any initialization or disposal. At some point later, an initialization function was introduced for the structure; but the "soft reset" path wasn't refactored to call the initialization function. When a guest nwo initiates a "soft reboot", uninitialized data structure leads to an assert() when later code finds the structure in an unexpected state. The effect of this is to crash the process monitoring the guest. How this affects the system depends on the structure of the toolstack. For xl, this will have no security-relevant effect: every VM has its own independent monitoring process, which contains no state. The domain in question will hang in a crashed state, but can be destroyed by `xl destroy` just like any other non-cooperating domain. For daemon-based toolstacks linked against libxl, such as libvirt, this will crash the toolstack, losing the state of any in-progress operations (localized DoS), and preventing further administrator operations unless the daemon is configured to restart automatically (system-wide DoS). If crashes "leak" resources, then repeated crashes could use up resources, also causing a system-wide DoS.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianxensid4.20.4+39-gf1e1321c87-1fixed
Debianxenforky4.20.4+39-gf1e1321c87-1fixed
Debianxentrixie4.20.3+127-gc42374a105-0+deb13u1fixed
Debianxentrixie-security4.20.4+39-gf1e1321c87-0+deb13u1fixed
Debianxenbookworm4.17.5+72-g01140da4e8-1fixed
Debianxenbookworm-security4.17.7-0+deb12u1fixed
Alpinexen3.114.13.3-r0fixed
Alpinexen3.124.13.3-r0fixed
Alpinexen3.144.15.0-r0fixed
Alpinexen3.154.15.0-r0fixed
Alpinexen3.164.15.0-r0fixed
Alpinexen3.174.15.0-r0fixed
Alpinexen3.184.15.0-r0fixed
Alpinexen3.194.15.0-r0fixed
Alpinexen3.204.15.0-r0fixed
Alpinexen3.214.15.0-r0fixed
Alpinexen3.224.15.0-r0fixed
Alpinexen3.234.15.0-r0fixed
Alpinexen3.244.15.0-r0fixed
Susexenlinux enterprise module for basesystem 15 sp24.13.2_08-3.25.3fixed
Susexenlinux enterprise module for server applications 15 sp24.13.2_08-3.25.3fixed
Susexenlinux enterprise micro 5.04.13.2_08-3.25.3fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianxensourcesid4.14.2+25-gb6a8c4f72d-1not yet assignedNot reportedNot reported
Debianxensourceforky4.14.2+25-gb6a8c4f72d-1not yet assignedNot reportedNot reported
Debianxensourcetrixie4.14.2+25-gb6a8c4f72d-1not yet assignedNot reportedNot reported
Debianxensourcebookworm4.14.2+25-gb6a8c4f72d-1not yet assignedNot reportedNot reported
Alpinexenapk3.114.13.3-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.124.13.3-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.144.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.154.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.164.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.174.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.184.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.194.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.204.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.214.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.224.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.234.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Alpinexenapk3.244.15.0-r0Not reportedALPINE-CVE-2021-28687Not reported
Susexenrpmlinux enterprise module for basesystem 15 sp24.13.2_08-3.25.3Not reportedSUSE-SU-2021:1028-1Not reported
Susexenrpmlinux enterprise module for server applications 15 sp24.13.2_08-3.25.3Not reportedSUSE-SU-2021:1028-1Not reported
Susexenrpmlinux enterprise micro 5.04.13.2_08-3.25.3Not reportedSUSE-SU-2021:1028-1Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [libxencall1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxen-dev]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxendevicemodel1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxenevtchn1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxenforeignmemory1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxengnttab1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxenhypfs1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxenmisc4.17]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxenstore4]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxentoolcore1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [libxentoollog1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-doc]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-hypervisor-4.17-amd64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-hypervisor-4.17-amd64-dbg]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-hypervisor-4.17-arm64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-hypervisor-4.17-arm64-dbg]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-hypervisor-common]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xenstore-utils]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-system-amd64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

  • [xen-system-arm64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Fixed · Fixed: 4.14.2+25-gb6a8c4f72d-1

      dsa · xen · debian · bookworm; dsa · xen · debian · 12

Next results

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]