NULL Pointer Dereference Affecting kernel-core package, versions *
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Test your applications- Snyk ID SNYK-RHEL9-KERNELCORE-7018639
- published 23 May 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2022-48707 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:9
kernel-core
.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-core
package and not the kernel-core
package as distributed by RHEL
.
See How to fix?
for RHEL:9
relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
cxl/region: Fix null pointer dereference for resetting decoder
Not all decoders have a reset callback.
The CXL specification allows a host bridge with a single root port to have no explicit HDM decoders. Currently the region driver assumes there are none. As such the CXL core creates a special pass through decoder instance without a commit/reset callback.
Prior to this patch, the ->reset() callback was called unconditionally when calling cxl_region_decode_reset. Thus a configuration with 1 Host Bridge, 1 Root Port, and one directly attached CXL type 3 device or multiple CXL type 3 devices attached to downstream ports of a switch can cause a null pointer dereference.
Before the fix, a kernel crash was observed when we destroy the region, and a pass through decoder is reset.
The issue can be reproduced as below, 1) create a region with a CXL setup which includes a HB with a single root port under which a memdev is attached directly. 2) destroy the region with cxl destroy-region regionX -f.