[Ksplice][Ubuntu-Oracle-Updates] New Ksplice updates for Ubuntu OCI kernel (USN-5209-1)

[Oracle Ksplice]

Synopsis: USN-5209-1 can now be patched using Ksplice
CVEs: CVE-2018-25020 CVE-2021-20321 CVE-2021-3760 CVE-2021-3896 CVE-2021-4002 CVE-2021-41864 CVE-2021-43389

Systems running Ubuntu OCI kernel can now use Ksplice to patch against
the latest Ubuntu Security Notice, USN-5209-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu OCI
kernel install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2021-43389, CVE-2021-3896: Out-of-bounds access in ISDN CAPI due to a race condition.

A race condition in Kernel CAPI Interface of the ISDN CAPI
implementation could result in an out-of-bounds access. A privileged
local user could use this flaw to cause a denial-of-service or execute
arbitrary code.


* CVE-2021-3760: Use-after-free in NFC subsystem when closing NCI RSP connection.

A use-after-free flaw could happen in NFC Controller Interface (NCI)
implementation of the NFC subsystem when closing NCI RSP connection.
A local attacker could use this to cause a denial-of-service or execute
arbitrary code.


* CVE-2021-41864: Out-of-bounds write access in eBPF during a map operation.

An integer overflow could happen in eBPF during a map operation
resulting in out-of-bounds write access. An unprivileged user
could use this flaw for a denial-of-service or to execute code.


* CVE-2021-20321: Denial-of-service in the OverlayFS subsystem due to a race condition.

A race condition flaw when accessing file objects in the OverlayFS
subsystem could lead to a system crash. A local user could use this flaw
to cause a denial-of-service.


* CVE-2021-4002: Information disclosure in the hugetlb due to memory leak.

A memory leak flaw in the hugetlbfs memory usage of the hugetlb
implementation could allow a local attacker to leak or alter data from
other processes that use huge pages and result in sensitive information
disclosure.


* CVE-2018-25020: Privileges escalation in BPF due to buffer overflow.

A buffer overflow flaw could happen in BPF subsystem when users run BPF
with long jump over an instruction sequence where inner instructions
require substantial expansions into multiple BPF instructions. A local
user could use this flaw to cause a denial-of-service or escalate their
privileges.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.