CVE-2024-26623 Affecting kernel-source-azure package, versions <6.4.0-150600.8.8.2
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES156-KERNELSOURCEAZURE-7680163
- published14 Aug 2024
- disclosed13 Aug 2024
Introduced: 13 Aug 2024
CVE-2024-26623 (opens in a new tab)How to fix?
Upgrade SLES:15.6 kernel-source-azure to version 6.4.0-150600.8.8.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-source-azure package and not the kernel-source-azure package as distributed by SLES.
See How to fix? for SLES:15.6 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
pds_core: Prevent race issues involving the adminq
There are multiple paths that can result in using the pdsc's adminq.
[1] pdsc_adminq_isr and the resulting work from queue_work(), i.e. pdsc_work_thread()->pdsc_process_adminq()
[2] pdsc_adminq_post()
When the device goes through reset via PCIe reset and/or a fw_down/fw_up cycle due to bad PCIe state or bad device state the adminq is destroyed and recreated.
A NULL pointer dereference can happen if [1] or [2] happens after the adminq is already destroyed.
In order to fix this, add some further state checks and implement reference counting for adminq uses. Reference counting was used because multiple threads can attempt to access the adminq at the same time via [1] or [2]. Additionally, multiple clients (i.e. pds-vfio-pci) can be using [2] at the same time.
The adminq_refcnt is initialized to 1 when the adminq has been allocated and is ready to use. Users/clients of the adminq (i.e. [1] and [2]) will increment the refcnt when they are using the adminq. When the driver goes into a fw_down cycle it will set the PDSC_S_FW_DEAD bit and then wait for the adminq_refcnt to hit 1. Setting the PDSC_S_FW_DEAD before waiting will prevent any further adminq_refcnt increments. Waiting for the adminq_refcnt to hit 1 allows for any current users of the adminq to finish before the driver frees the adminq. Once the adminq_refcnt hits 1 the driver clears the refcnt to signify that the adminq is deleted and cannot be used. On the fw_up cycle the driver will once again initialize the adminq_refcnt to 1 allowing the adminq to be used again.
References
- https://www.suse.com/security/cve/CVE-2024-26623.html
- https://bugzilla.suse.com/1221057
- https://git.kernel.org/stable/c/22cd6046eb2148b18990257505834dd45c672a1b
- https://git.kernel.org/stable/c/5939feb63ea1f011027576c64b68b681cbad31ca
- https://git.kernel.org/stable/c/7e82a8745b951b1e794cc780d46f3fbee5e93447