CVE-2021-20257

Description

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Related CPE's

aqemuqemu********

ofedoraprojectfedora33*******

oredhatenterprise_linux6.0*******

oredhatenterprise_linux8.0*******

oredhatenterprise_linux8.0***advanced_virtualization***

aredhatopenstack_platform13.0*******

aredhatopenstack_platform10.0*******

oredhatenterprise_linux_for_power_little_endian8.0*******

oredhatenterprise_linux_for_ibm_z_systems8.0*******

aredhatcodeready_linux_builder-*******

References

https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html

Mailing ListPatchVendor Advisory

https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8

PatchThird Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=1930087

Issue TrackingPatchThird Party Advisory

https://www.openwall.com/lists/oss-security/2021/02/25/2

Mailing ListPatchThird Party Advisory

https://security.netapp.com/advisory/ntap-20220425-0003/

Third Party Advisory

CvssV3 impact

BaseSeverity

MEDIUM

ConfidentialityImpact

NONE

AttackComplexity

LOW

Scope

CHANGED

AttackVector

LOCAL

AvailabilityImpact

HIGH

IntegrityImpact

NONE

PrivilegesRequired

LOW

BaseScore

6.5

VectorString

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

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

LOW

ConfidentialityImpact

NONE

AvailabilityImpact

PARTIAL

IntegrityImpact

NONE

BaseScore

2.1

VectorString

AV:L/AC:L/Au:N/C:N/I:N/A:P

Version

2.0

AccessVector

LOCAL

Authentication

NONE

Created by Yello
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