[El-errata] New openssl updates available via Ksplice (ELSA-2021-4424)

Errata Announcements for Oracle Linux el-errata at oss.oracle.com
Mon Nov 29 14:38:24 UTC 2021

Synopsis: ELSA-2021-4424 can now be patched using Ksplice
CVEs: CVE-2021-23840 CVE-2021-23841

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2021-4424.


We recommend that all users of Ksplice on OL 8 install these updates.

You can install these updates by running:

# ksplice -y user upgrade

32-bit applications should be restarted after upgrading the on-disk
openssl RPMs and statically linked applications using
openssl should be rebuilt to include these fixes.

Ksplice user-space patching requires installation of Ksplice-aware
packages and the system must be rebooted after the first installation of
these packages.  Refer to the installation instructions for the Enhanced
Ksplice Client in the Ksplice User's Guide for more details.  Systems
may be prepared for Ksplice patching by installing the Ksplice aware
packages in advance, prior to installing the enhanced Ksplice client.


* CVE-2021-23841: Denial-of-service when using X509_issuer_and_serial_hash()

A wrong error handling when using X509_issuer_and_serial_hash() could
lead to a NULL pointer dereference. A remote attacker could use this
flaw and a handcrafted  X509 certificate to cause a denial-of-service.

* CVE-2021-23840: Denial-of-service in CipherUpdate.

A missing check when using CipherUpdate could lead to an integer
overflow. A local attacker could use this flaw to cause a denial-of-


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

More information about the El-errata mailing list