Alpine: xen: security update to 4.13.3-r2

high Tenable Cloud Security Plugin ID 407782

Description

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

- grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to
certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest
for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched
(back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these
pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the
guest to insert mappings of these pages may result in any of them to become mapped in multiple locations.
Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps
re-used for other purposes. (CVE-2021-28697)

- IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains
which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify
regions of memory which should be left untranslated, which typically means these addresses should pass the
translation phase unaltered. While these are typically device specific ACPI properties, they can also be
specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed
to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a
discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-
mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the
identity mappings would be left in place, allowing a guest continued access to ranges of memory which it
shouldn't have access to anymore (CVE-2021-28696). (CVE-2021-28694, CVE-2021-28695, CVE-2021-28696)

Plugin Details

Severity: High

ID: 407782

Version: Revision 1.30

Type: Local

Family: Alpine Linux Local Security Checks

Published: 10/31/2023

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.15

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-28697

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/27/2021

Reference Information

CVE: CVE-2021-28694, CVE-2021-28695, CVE-2021-28696, CVE-2021-28697, CVE-2021-28698, CVE-2021-28699, CVE-2021-28700

IAVB: 2021-B-0060-S

Detections

Analytics