Use After Free Affecting kernel-rt-modules-extra package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra package and not the kernel-rt-modules-extra package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

scsi: iscsi: Fix conn use after free during resets

If we haven't done a unbind target call we can race where iscsi_conn_teardown wakes up the EH thread and then frees the conn while those threads are still accessing the conn ehwait.

We can only do one TMF per session so this just moves the TMF fields from the conn to the session. We can then rely on the iscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call to remove the target and it's devices, and know after that point there is no device or scsi-ml callout trying to access the session.

• https://access.redhat.com/security/cve/CVE-2021-47328
• https://git.kernel.org/stable/c/89812e7957ab0746eab66ed6fc49d52bb4dca250
• https://git.kernel.org/stable/c/bf20d85a88384574fabb3d53ad62a8af57e7ab11
• https://git.kernel.org/stable/c/d04958a348e560938410e04a12fb99da9c7e6a00
• https://git.kernel.org/stable/c/ec29d0ac29be366450a7faffbcf8cba3a6a3b506
• https://git.kernel.org/stable/c/f0a031f7c55ffd944fead1ddaf2aa94df9a158c1
• https://git.kernel.org/stable/c/fa9542b35ceb4202e8f8d65f440529a63524dca9