Red Hat Enterprise Linux Advanced Virtualization 8 update for the virt:av and virt-devel:av modules
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-20257 CVE-2021-3930 |
| CWE-ID | CWE-835 CWE-193 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Red Hat Enterprise Linux Advanced Virtualization Server applications / Virtualization software |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Infinite loop
EUVDB-ID: #VU59085
Risk: Medium
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-20257
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in the e1000 NIC emulator when processing transmits (tx) descriptors in process_tx_desc of QEMU. A remote user can consume all available CPU resources and cause denial of service conditions.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Advanced Virtualization: 8
External linkshttp://access.redhat.com/errata/RHSA-2022:0081
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Off-by-one
EUVDB-ID: #VU58812
Risk: Medium
CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3930
CWE-ID:
CWE-193 - Off-by-one Error
Exploit availability: No
DescriptionThe vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to an off-by-one error in the SCSI device emulation in QEMU. A remote user on the guest OS can can trigger an off-by-one error while processing MODE SELECT commands in mode_sense_page() if the 'page' argument is set to MODE_PAGE_ALLS (0x3f). Successful exploitation of the vulnerability may result in QEMU crash.
Install updates from vendor's website.
Red Hat Enterprise Linux Advanced Virtualization: 8
External linkshttp://access.redhat.com/errata/RHSA-2022:0081
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
