PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for the specified order, yet some code involved in PoD handling actually makes such an assumption. These operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707), the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain. (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708, patch 2).

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains     which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-     on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are     permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on     ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation     of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for     the specified order, yet some code involved in PoD handling actually makes such an assumption. These     operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707),     the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain.
    (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation     can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708,     patch 2). (CVE-2021-28704)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains
    which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-
    on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are
    permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on
    ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation
    of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for
    the specified order, yet some code involved in PoD handling actually makes such an assumption. These
    operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707),
    the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain.
    (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation
    can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708,
    patch 2). (CVE-2021-28704, CVE-2021-28707, CVE-2021-28708)

  - issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs;
    the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be
    started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory
    assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These
    hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of
    pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error
    handling in certain PoD cases has been insufficient in that in particular partial success of some
    operations was not properly accounted for. There are two code paths affected - page removal
    (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix
    to both issues.) (CVE-2021-28705, CVE-2021-28709)

The remote host is affected by the vulnerability described in GLSA-202402-07 (Xen: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below     for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains
    which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-
    on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are
    permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on
    ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation
    of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for
    the specified order, yet some code involved in PoD handling actually makes such an assumption. These
    operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707),
    the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain.
    (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation
    can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708,
    patch 2). (CVE-2021-28704, CVE-2021-28707, CVE-2021-28708)

  - issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs;
    the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be
    started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory
    assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These
    hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of
    pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error
    handling in certain PoD cases has been insufficient in that in particular partial success of some
    operations was not properly accounted for. There are two code paths affected - page removal
    (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix
    to both issues.) (CVE-2021-28705)

  - guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of
    memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator
    established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It
    would then only be the overflowed (and hence small) number which gets compared against the established
    upper bound. (CVE-2021-28706)

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3977-1 advisory.

    - CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
    - CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

    - Upstream bug fixes (bsc#1027519)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:3968-1 advisory.

  - PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved     Memory Regions (specified via Reserved Memory Region Reporting, RMRR). These are typically used for     platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest     shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not     properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent     DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory     corruption. (CVE-2021-28702)

  - PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains     which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-     on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are     permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on     ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation     of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for     the specified order, yet some code involved in PoD handling actually makes such an assumption. These     operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707),     the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain.
    (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation     can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708,     patch 2). (CVE-2021-28704, CVE-2021-28707, CVE-2021-28708)

  - issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs;
    the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be     started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory     assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These     hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of     pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error     handling in certain PoD cases has been insufficient in that in particular partial success of some     operations was not properly accounted for. There are two code paths affected - page removal     (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix     to both issues.) (CVE-2021-28705, CVE-2021-28709)

  - guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of     memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator     established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It     would then only be the overflowed (and hence small) number which gets compared against the established     upper bound. (CVE-2021-28706)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3968-1 advisory.

    - CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

    - Update to Xen 4.14.3 bug fix release (bsc#1027519).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1543-1 advisory.

  - PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved     Memory Regions (specified via Reserved Memory Region Reporting, RMRR). These are typically used for     platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest     shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not     properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent     DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory     corruption. (CVE-2021-28702)

  - PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains     which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-     on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are     permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on     ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation     of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for     the specified order, yet some code involved in PoD handling actually makes such an assumption. These     operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707),     the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain.
    (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation     can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708,     patch 2). (CVE-2021-28704, CVE-2021-28707, CVE-2021-28708)

  - issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs;
    the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be     started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory     assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These     hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of     pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error     handling in certain PoD cases has been insufficient in that in particular partial success of some     operations was not properly accounted for. There are two code paths affected - page removal     (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix     to both issues.) (CVE-2021-28705, CVE-2021-28709)

  - guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of     memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator     established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It     would then only be the overflowed (and hence small) number which gets compared against the established     upper bound. (CVE-2021-28706)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5017 advisory.

    Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in privilege     escalation, denial of service or information leaks. For the stable distribution (bullseye), these problems     have been fixed in version 4.14.3+32-g9de3671772-1~deb11u1. We recommend that you upgrade your xen     packages. For the detailed security status of xen please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/xen

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3888-1 advisory.

    - CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

    - Update to Xen 4.13.4 bug fix release (bsc#1027519).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3852-1 advisory.

    - CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

    - Fixed 15sp4 uefi fv guest on 12sp5 host unable to bootup with sriov pci device plugin (bsc#1191510).
    - Upstream bug fixes (bsc#1027519).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3842-1 advisory.

    - CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

    - Integrate bugfixes (bsc#1189373, bsc#1189378).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3851-1 advisory.

    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3849-1 advisory.

    - CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
    - Integrate bugfixes (bsc#1189373, bsc#1189378)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3813-1 advisory.

    - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388)     (bsc#1192557).
    - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389)     (bsc#1192559).
    - CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
256208	Linux Distros Unpatched Vulnerability : CVE-2021-28704	Nessus	Misc.	high
424708	Alpine: multiple xen packages: security update to 4.15.1-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	high
424708	Alpine: multiple xen packages: security update to 4.15.1-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
189976	GLSA-202402-07 : Xen: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	high
407799	Alpine: xen: security update to 4.14.3-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	high
407799	Alpine: xen: security update to 4.14.3-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
407787	Alpine: xen: security update to 4.13.4-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	high
407787	Alpine: xen: security update to 4.13.4-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
155990	SUSE SLES15 Security Update : xen (SUSE-SU-2021:3977-1)	Nessus	SuSE Local Security Checks	high
155932	openSUSE 15 Security Update : xen (openSUSE-SU-2021:3968-1)	Nessus	SuSE Local Security Checks	high
155929	SUSE SLED15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2021:3968-1)	Nessus	SuSE Local Security Checks	high
155875	openSUSE 15 Security Update : xen (openSUSE-SU-2021:1543-1)	Nessus	SuSE Local Security Checks	high
155870	Debian DSA-5017-1 : xen - security update	Nessus	Debian Local Security Checks	high
155856	SUSE SLED15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2021:3888-1)	Nessus	SuSE Local Security Checks	high
155808	SUSE SLED12: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2021:3852-1)	Nessus	SuSE Local Security Checks	high
155804	SUSE SLES15 Security Update : xen (SUSE-SU-2021:3842-1)	Nessus	SuSE Local Security Checks	high
155803	SUSE SLES12: xen / xen-doc-html / xen-libs / xen-libs-32bit / xen-tools / etc (SUSE-SU-2021:3851-1)	Nessus	SuSE Local Security Checks	high
155793	SUSE SLES12: xen / xen-doc-html / xen-libs / xen-libs-32bit / xen-tools / etc (SUSE-SU-2021:3849-1)	Nessus	SuSE Local Security Checks	high
155723	SUSE SLES12: xen / xen-doc-html / xen-libs / xen-libs-32bit / xen-tools / etc (SUSE-SU-2021:3813-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2021-28704

high

Tenable Plugins

high

high

high

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high

high

high

high

high

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high

high

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