CVE-2020-15852

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.16%
Vendor Advisory kernel.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://xenbits.xen.org/xsa/advisory-329.html third party advisory patch
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2 third party advisory patch
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2 mailing list patch vendor advisory
http://www.openwall.com/lists/oss-security/2020/07/21/2 third party advisory mailing list
https://security.netapp.com/advisory/ntap-20200810-0001/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-15852?
CVE-2020-15852 has been scored as a high severity vulnerability.
How to fix CVE-2020-15852?
To fix CVE-2020-15852, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-15852 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-15852 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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