What is CVE-2021-26931?

CVE-2021-26931 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2021-26931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-26931?

CVE-2021-26931 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-26931?

No patch is currently available for CVE-2021-26931. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-26931 actively exploited?

CVE-2021-26931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-26931

Medium

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.

Package Linux Kernel

Published 2021-02-17

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-770

CVE-2021-26931 is classified as CWE-770

See CWE-770 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-26931 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Debian Security
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html

Mailing List Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html

Mailing List Third Party Advisory
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
Security
https://security.netapp.com/advisory/ntap-20210326-0001/

Third Party Advisory
Kernel patch commit
http://xenbits.xen.org/xsa/advisory-362.html
Patch
Kernel patch commit
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3194a1746e8aabe86075fd3c5e7cf1f4632d7f16
Patch
Kernel patch commit
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5a264285ed1cd32e26d9de4f3c8c6855e467fd63
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2021-26931

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2021-02-17

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-26931?

CVE-2021-26931 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2021-26931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-26931?

CVE-2021-26931 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-26931?

No patch is currently available for CVE-2021-26931. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-26931 actively exploited?

No — CVE-2021-26931 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.