[Ksplice][Ubuntu-22.04-Updates] New Ksplice updates for Ubuntu 22.04 Jammy (USN-6315-1)

[Oracle Ksplice]

Synopsis: USN-6315-1 can now be patched using Ksplice
CVEs: CVE-2022-40982 CVE-2023-20593 CVE-2023-21400 CVE-2023-3609 CVE-2023-3610 CVE-2023-3611 CVE-2023-3776 CVE-2023-3777 CVE-2023-3995 CVE-2023-4004 CVE-2023-4015

Systems running Ubuntu 22.04 Jammy can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-6315-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu 22.04
Jammy 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-2023-3609: Privilege escalation in U32 network packet classifier.

Incorrect reference counter handling in the network packet scheduler when
classifying using Universal 32-bit comparisons with hashing can lead to
use-after-free. This can allow a local user to trigger privilege escalation.


* Note: Oracle will not provide a zero-downtime update for CVE-2023-3610.

Oracle has determined that patching CVE-2023-3610 on a running system would
not be safe and recommends a reboot.


* CVE-2023-3611: Privilege escalation in QFQ scheduler.

A buffer overrun when configuring the Quick Fair Queue scheduler might
allow a user to overwrite kernel memory, potentially allowing them to
execute arbitrary code.


* CVE-2023-4004: Privilege escalation in netfilter PIPAPO.

A use-after-free when removing a policy from the netfilter Pile Packet
Policies subsystem might result in a denial-of-service or arbitrary code
execution.


* CVE-2023-3776: Use-after-free in netfilter classifier due to refcount error.

Incorrect refcounting in the netfilter classifier might result in
use-after-free, potentially allowing an attacker to cause a
denial-of-service.


* CVE-2023-3995: Netfilter rule chain addition causes DoS.

Missing validation when adding a rule to a bound netfilter rule chain
via NFTA_RULE_CHAIN_ID might result in an invalid operation and system
crash. A malicious user might exploit this to cause a denial-of-service.


* CVE-2023-3777: Denial-of-service when flushing netfilter rules tables.

When flushing netfilter rules, bound rule chains are erroneously freed.
A malicious user might exploit this to crash the kernel and cause a
denial-of-service.


* CVE-2023-21400: Privilege escalation in io_uring due to improper locking.

Missing locking when queueing io_uring functions might result in kernel
memory corruption. This can be exploited to execute arbitrary code in
the kernel.


* Note: Oracle will not provide a zero-downtime update for CVE-2023-4015.

Oracle has determined that patching CVE-2023-4015 would not be safe.
Oracle recommends disabling the ability for unprivileged users to
create netfilter namespaces. This can be accomplished by running:

	sudo sysctl -w kernel.unprivileged_userns_clone=0


* Note: Oracle will not provide a zero-downtime fix for CVE-2023-20593.

The optimal fix for this CVE on systems running Ubuntu Jammy is a microcode
update for affected CPUs.  Customers will need to upgrade the microcode
on affected CPUs in order to mitigate this vulnerability.


* Note: Oracle will not provide a zero-downtime update for CVE-2022-40982.

The fix for this CVE on systems running Ubuntu Jammy is a microcode
update for affected CPUs. Customers will need to upgrade the microcode
on affected CPUs in order to mitigate this vulnerability.

SUPPORT

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