What is CVE-2021-26930?

CVE-2021-26930 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10. CVE-2021-26930 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-26930?

CVE-2021-26930 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-26930?

No patch is currently available for CVE-2021-26930. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-26930 actively exploited?

CVE-2021-26930 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-26930

High

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.

Package Linux Kernel

Published 2021-02-17

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

References

The following references provide additional information about CVE-2021-26930 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-365.html
Patch
Kernel patch commit
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=871997bc9e423f05c7da7c9178e62dde5df2a7f8
Patch

Details

CVE ID CVE-2021-26930

Severity High

CVSS score 7.8 / 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-2021-26930?

CVE-2021-26930 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2021-26930 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-26930?

CVE-2021-26930 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-26930?

No patch is currently available for CVE-2021-26930. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-26930 actively exploited?

No — CVE-2021-26930 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.