ELA-463-1 linux-4.9 security update
Package linux-4.9
ELA-463-1 linux-4.9 security update
Version 4.9.272-2~deb8u1
Related CVEs CVE-2021-3609 CVE-2021-21781 CVE-2021-33909 CVE-2021-34693
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.
CVE-2021-3609
Norbert Slusarek reported a race condition vulnerability in the CAN
BCM networking protocol, allowing a local attacker to escalate
privileges.
CVE-2021-21781
"Lilith >_>" of Cisco Talos discovered that the Arm initialisation
code does not fully initialise the "sigpage" that is mapped into
user-space processes to support signal handling. This could
result in leaking sensitive information, particularly when the
system is rebooted.
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 Debian 8 jessie, these problems have been fixed in version 4.9.272-2~deb8u1.
We recommend that you upgrade your linux-4.9 packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/
A linux-4.9 security update has been released for Debian GNU/Linux 8 Extended LTS to address several vulnerabilities.
