CVE-2021-26931

Public on 2021-03-18
Modified on 2021-03-19
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.
Severity
Medium
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 kernel 2021-03-18 01:13 ALAS2-2021-1616
Amazon Linux 1 kernel 2021-03-18 17:29 ALAS-2021-1487

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv2 1.9 AV:L/AC:M/Au:N/C:N/I:N/A:P
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 1.9 AV:L/AC:M/Au:N/C:N/I:N/A:P
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H