CVE-2021-26931
Public on 2021-02-17
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
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | 2021-03-18 | ALAS-2021-1487 | Fixed |
| Amazon Linux 2 - Core | kernel | 2021-03-18 | ALAS2-2021-1616 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-01-11 | ALAS2KERNEL-5.4-2022-001 | Fixed |
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 |