CVE-2024-26761
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.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/031217128990d7f0ab8c46db1afb3cf1e075fd29Patch
- https://git.kernel.org/stable/c/0cab687205986491302cd2e440ef1d253031c221Patch
- https://git.kernel.org/stable/c/2cc1a530ab31c65b52daf3cb5d0883c8b614ea69Patch
- https://git.kernel.org/stable/c/3a3181a71935774bda2398451256d7441426420bPatch
- https://git.kernel.org/stable/c/031217128990d7f0ab8c46db1afb3cf1e075fd29Patch
- https://git.kernel.org/stable/c/0cab687205986491302cd2e440ef1d253031c221Patch
- https://git.kernel.org/stable/c/2cc1a530ab31c65b52daf3cb5d0883c8b614ea69Patch
- https://git.kernel.org/stable/c/3a3181a71935774bda2398451256d7441426420bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.