CVE-2021-26933

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no guarantee when all the writes will reach the memory.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected software

No affected versions have been published.

Timeline

Published: Feb 17, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-269347.8An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation (aka be-alloc) mode of the drm_xen_CVE-2021-269357.5In WoWonder < 3.1, remote attackers can gain access to the database by exploiting a requests.php?f=search-my-followers SQL Injection vulnera CVE-2021-269367.8The replay-sorcery program in ReplaySorcery 0.4.0 through 0.5.0, when using the default setuid-root configuration, allows a local attacker t CVE-2021-269379.8encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or CVE-2021-269385.4A stored XSS issue exists in henriquedornas 5.2.17 via online live chat. NOTE: Third parties report that no such product exists. That henriq CVE-2021-269397.5An information disclosure issue exists in henriquedornas 5.2.17 because an attacker can dump phpMyAdmin SQL content. NOTE: third parties rep CVE-2021-269438.2The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory loc CVE-2021-269455.5An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to cras CVE-2021-269476.1Cross-site scripting (XSS) issue Odoo Community 15.0 and earlier and Odoo Enterprise 15.0 and earlier, allows remote attackers to inject arb CVE-2021-269487.8Null pointer dereference in the htmldoc v1.9.11 and before may allow attackers to execute arbitrary code and cause a denial of service via a CVE-2021-269505.5Out of bounds read in firmware for some Intel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R) products before version 22.120 may allow CVE-2021-269519.8An issue was discovered in the calamine crate before 0.17.0 for Rust. It allows attackers to overwrite heap-memory locations because Vec::se