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PUBLISHED

CVE-2024-26761

cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-03

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window The Linux CXL subsystem is built on the assumption that HPA == SPA. That is, the host physical address (HPA) the HDM decoder registers are programmed with are system physical addresses (SPA). During HDM decoder setup, the DVSEC CXL range registers (cxl-3.1, 8.1.3.8) are checked if the memory is enabled and the CXL range is in a HPA window that is described in a CFMWS structure of the CXL host bridge (cxl-3.1, 9.18.1.3). Now, if the HPA is not an SPA, the CXL range does not match a CFMWS window and the CXL memory range will be disabled then. The HDM decoder stops working which causes system memory being disabled and further a system hang during HDM decoder initialization, typically when a CXL enabled kernel boots. Prevent a system hang and do not disable the HDM decoder if the decoder's CXL range is not found in a CFMWS window. Note the change only fixes a hardware hang, but does not implement HPA/SPA translation. Support for this can be added in a follow on patch series.

Product status

Default status
unaffected

34e37b4c432c before 031217128990
affected

34e37b4c432c before 2cc1a530ab31
affected

34e37b4c432c before 3a3181a71935
affected

34e37b4c432c before 0cab68720598
affected

Default status
affected

5.19
affected

Any version before 5.19
unaffected

6.1.80
unaffected

6.6.19
unaffected

6.7.7
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/031217128990d7f0ab8c46db1afb3cf1e075fd29

https://git.kernel.org/stable/c/2cc1a530ab31c65b52daf3cb5d0883c8b614ea69

https://git.kernel.org/stable/c/3a3181a71935774bda2398451256d7441426420b

https://git.kernel.org/stable/c/0cab687205986491302cd2e440ef1d253031c221

cve.org CVE-2024-26761

nvd.nist.gov CVE-2024-26761

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