Memory Leak Affecting kernel-debug-uki-virt package, versions <0:5.14.0-427.33.1.el9_4
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Test your applications- Snyk ID SNYK-ORACLE9-KERNELDEBUGUKIVIRT-7852835
- published 30 Aug 2024
- disclosed 30 Jul 2024
Introduced: 30 Jul 2024
CVE-2024-42152 Open this link in a new tabHow to fix?
Upgrade Oracle:9 kernel-debug-uki-virt to version 0:5.14.0-427.33.1.el9_4 or higher.
This issue was patched in ELSA-2024-5928.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-uki-virt package and not the kernel-debug-uki-virt package as distributed by Oracle.
See How to fix? for Oracle:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
nvmet: fix a possible leak when destroy a ctrl during qp establishment
In nvmet_sq_destroy we capture sq->ctrl early and if it is non-NULL we know that a ctrl was allocated (in the admin connect request handler) and we need to release pending AERs, clear ctrl->sqs and sq->ctrl (for nvme-loop primarily), and drop the final reference on the ctrl.
However, a small window is possible where nvmet_sq_destroy starts (as a result of the client giving up and disconnecting) concurrently with the nvme admin connect cmd (which may be in an early stage). But before kill_and_confirm of sq->ref (i.e. the admin connect managed to get an sq live reference). In this case, sq->ctrl was allocated however after it was captured in a local variable in nvmet_sq_destroy. This prevented the final reference drop on the ctrl.
Solve this by re-capturing the sq->ctrl after all inflight request has completed, where for sure sq->ctrl reference is final, and move forward based on that.
This issue was observed in an environment with many hosts connecting multiple ctrls simoutanuosly, creating a delay in allocating a ctrl leading up to this race window.
References
- https://linux.oracle.com/cve/CVE-2024-42152.html
- https://linux.oracle.com/errata/ELSA-2024-12618.html
- https://linux.oracle.com/errata/ELSA-2024-5928.html
- https://git.kernel.org/stable/c/2f3c22b1d3d7e86712253244797a651998c141fa
- https://git.kernel.org/stable/c/5502c1f1d0d7472706cc1f201aecf1c935d302d1
- https://git.kernel.org/stable/c/818004f2a380420c19872171be716174d4985e33
- https://git.kernel.org/stable/c/940a71f08ef153ef807f751310b0648d1fa5d0da
- https://git.kernel.org/stable/c/b4fed1443a6571d49c6ffe7d97af3bbe5ee6dff5
- https://git.kernel.org/stable/c/c758b77d4a0a0ed3a1292b3fd7a2aeccd1a169a4