CVE-2022-48707 (GCVE-0-2022-48707)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:22 – Updated: 2025-05-04 08:21
VLAI?
Title
cxl/region: Fix null pointer dereference for resetting decoder
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 176baefb2eb5d7a3ddebe3ff803db1fce44574b5 , < a04c7d062b537ff787d00da95bdfe343260d4beb (git)
Affected: 176baefb2eb5d7a3ddebe3ff803db1fce44574b5 , < 4fa4302d6dc7de7e8e74dc7405611a2efb4bf54b (git)
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    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.12 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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