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[SECURITY] [DLA 2714-1] linux-4.19 security update

Debian LTS Advisory DLA-2714-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                        Ben Hutchings
July 20, 2021                                 https://wiki.debian.org/LTS

Package        : linux-4.19
Version        : 4.19.194-3~deb9u1
CVE ID         : CVE-2020-36311 CVE-2021-3609 CVE-2021-33909 CVE-2021-34693
Debian Bug     : 990072

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

This update is not yet available for the armhf (ARM EABI hard-float)


    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 Debian 9 stretch, these problems have been fixed in version
4.19.194-3~deb9u1.  This additionally fixes a regression in the
previous update (#990072) that affected LXC.

We recommend that you upgrade your linux-4.19 packages.

For the detailed security status of linux-4.19 please refer to
its security tracker page at:

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

Ben Hutchings - Debian developer, member of kernel, installer and LTS teams

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