Debian: DSA-4941-1: linux security update

Debian: DSA-4941-1: linux security update

Debian Security Advisory DSA-4941-1 [email protected]
https://www.debian.org/security/ Salvatore Bonaccorso
July 20, 2021 https://www.debian.org/security/faq

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

CVE-2020-36311

A flaw was discovered in the KVM subsystem for AMD CPUs, allowing an
attacker to cause a denial of service by triggering destruction of a
large SEV VM.

CVE-2021-3609

Norbert Slusarek reported a race condition vulnerability in the CAN
BCM networking protocol, allowing a local attacker to escalate
privileges.

CVE-2021-33909

The Qualys Research Labs discovered a size_t-to-int conversion
vulnerability in the Linux kernel’s filesystem layer. An
unprivileged local attacker able to create, mount, and then delete a
deep directory structure whose total path length exceeds 1GB, can
take advantage of this flaw for privilege escalation.

Details can be found in the Qualys advisory at
https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt

CVE-2021-34693

Norbert Slusarek discovered an information leak in the CAN BCM
networking protocol. A local attacker can take advantage of this
flaw to obtain sensitive information from kernel stack memory.

For the stable distribution (buster), these problems have been fixed in
version 4.19.194-3.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: [email protected]

https://linuxsecurity.com/advisories/debian/debian-dsa-4941-1-linux-security-update-08-53-32