Debian: DSA-4941-1: linux security update

Debian: DSA-4941-1: linux security update

Debian Security Advisory DSA-4941-1 [email protected] Salvatore Bonaccorso
July 20, 2021

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


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.


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


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


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:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:

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