CVE-2020-15852

Name: CVE-2020-15852
Creator: NVD / NIST
Published: 2020-07-20T19:15:11.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2020-15852 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.33%

24.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.5, <= 5.7.9
Xen	Xen	<= 4.13.1
Netapp	Cloud Backup	All versions
Netapp	Steelstore Cloud Integrated Storage	All versions
Netapp	Solidfire Baseboard Management Controller	All versions

References

http://www.openwall.com/lists/oss-security/2020/07/21/2Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-329.htmlPatch, Third Party Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200810-0001/Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/21/2Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-329.htmlPatch, Third Party Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200810-0001/Third Party Advisory

Timeline

Published: Jul 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15852?

How severe is CVE-2020-15852?

CVE-2020-15852 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15852?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15852?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST