Fedora 36 update for xen



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-33745
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

xen
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU65801

Risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2022-33745

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in code responsible for migration and work around of kernels unaware of L1TF in shadow mode, related to TLB flush. A remote user with access to x86 PV guest can start the migration process to trigger the vulnerability and exhaust all available memory, resulting in a denial of service (DoS) attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 36

xen: before 4.16.1-8.fc36

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2022-4f7cd241e2


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.



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