CVE-2021-26931

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.

Metrics

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

Weakness enumeration

CWE-770

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-2021-269325.5An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, w CVE-2021-269335.5An 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. Th 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