What is CVE-2021-34556?

CVE-2021-34556 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2021-34556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-34556?

CVE-2021-34556 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:H/I:N/A:N.

Is there a patch available for CVE-2021-34556?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-34556 patch availability.

Is CVE-2021-34556 actively exploited?

CVE-2021-34556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-34556

Medium

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

Package Linux Kernel

Published 2021-08-02

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

High

Integrity

None

Availability

None

Vector string

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

Weakness type

CWE-203

CVE-2021-34556 is classified as CWE-203

See CWE-203 on MITRE CWE for full details on this weakness type.

References

6 total

Kernel Git
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee

Patch Vendor Advisory
Kernel Git
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c

Patch Vendor Advisory
Openwall
http://www.openwall.com/lists/oss-security/2021/08/01/3

Mailing List
Debian Security
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html

Mailing List Third Party Advisory
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4/

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2021-34556

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2021-08-02

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-34556?

CVE-2021-34556 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2021-34556 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-34556?

CVE-2021-34556 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:H/I:N/A:N.
Is there a patch available for CVE-2021-34556?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-34556 patch availability.
Is CVE-2021-34556 actively exploited?

No. CVE-2021-34556 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.