NULL Pointer Dereference Affecting kernel-coco_debug-devel package, versions <6.4.0-15061.6.coco15sp6.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about NULL Pointer Dereference vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-SLES156-KERNELCOCODEBUGDEVEL-8170697
- published9 Oct 2024
- disclosed8 Oct 2024
Introduced: 8 Oct 2024
CVE-2024-46693 (opens in a new tab)How to fix?
Upgrade SLES:15.6 kernel-coco_debug-devel to version 6.4.0-15061.6.coco15sp6.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-coco_debug-devel package and not the kernel-coco_debug-devel 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:
soc: qcom: pmic_glink: Fix race during initialization
As pointed out by Stephen Boyd it is possible that during initialization of the pmic_glink child drivers, the protection-domain notifiers fires, and the associated work is scheduled, before the client registration returns and as a result the local "client" pointer has been initialized.
The outcome of this is a NULL pointer dereference as the "client" pointer is blindly dereferenced.
Timeline provided by Stephen: CPU0 CPU1
ucsi->client = NULL; devm_pmic_glink_register_client() client->pdr_notify(client->priv, pg->client_state) pmic_glink_ucsi_pdr_notify() schedule_work(&ucsi->register_work) <schedule away> pmic_glink_ucsi_register() ucsi_register() pmic_glink_ucsi_read_version() pmic_glink_ucsi_read() pmic_glink_ucsi_read() pmic_glink_send(ucsi->client) <client is NULL BAD> ucsi->client = client // Too late!
This code is identical across the altmode, battery manager and usci child drivers.
Resolve this by splitting the allocation of the "client" object and the registration thereof into two operations.
This only happens if the protection domain registry is populated at the time of registration, which by the introduction of commit '1ebcde047c54 ("soc: qcom: add pd-mapper implementation")' became much more likely.
References
- https://www.suse.com/security/cve/CVE-2024-46693.html
- https://bugzilla.suse.com/1230521
- https://git.kernel.org/stable/c/1efdbf5323c9360e05066049b97414405e94e087
- https://git.kernel.org/stable/c/3568affcddd68743e25aa3ec1647d9b82797757b
- https://git.kernel.org/stable/c/943b0e7cc646a624bb20a68080f8f1a4a55df41c