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Vulnerability · Published Feb 17, 2021 · Assigned by mitre

CVE-2021-26931

Medium 5.5

In plain English

A medium-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 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.6%top 53.4% 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 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.19-1DEBIAN-CVE-2021-26931
Debian:13linux5.10.19-1DEBIAN-CVE-2021-26931
Debian:14linux5.10.19-1DEBIAN-CVE-2021-26931
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-26931
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-26931
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-26931

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References