Log in Start free

Vulnerability · Published Feb 17, 2021 · Assigned by mitre

CVE-2021-26930

High 7.8

In plain English

A high-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.3%top 71.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.19-1DEBIAN-CVE-2021-26930
Debian:13linux5.10.19-1DEBIAN-CVE-2021-26930
Debian:14linux5.10.19-1DEBIAN-CVE-2021-26930
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-26930
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-26930
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-26930

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References