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CVE-2020-15852

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Date: July 20, 2020

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.

Language: Go

Severity Score

Related Resources (9)

https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2
https://security.netapp.com/advisory/ntap-20200810-0001/
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-15852
https://nvd.nist.gov/vuln/detail/CVE-2020-15852
http://xenbits.xen.org/xsa/advisory-329.html
https://security-tracker.debian.org/tracker/CVE-2020-15852
http://www.openwall.com/lists/oss-security/2020/07/21/2
https://www.mend.io/vulnerability-database/CVE-2020-15852

Severity Score

Weakness Type (CWE)

Incorrect Default Permissions

CWE-276

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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