CVE-2024-26761 (GCVE-0-2024-26761)

Vulnerability from cvelistv5 – Published: 2024-04-03 17:00 – Updated: 2025-05-04 08:55
VLAI?
Title
cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 34e37b4c432cd0f1842b352fde4b8878b4166888 , < 031217128990d7f0ab8c46db1afb3cf1e075fd29 (git)
Affected: 34e37b4c432cd0f1842b352fde4b8878b4166888 , < 2cc1a530ab31c65b52daf3cb5d0883c8b614ea69 (git)
Affected: 34e37b4c432cd0f1842b352fde4b8878b4166888 , < 3a3181a71935774bda2398451256d7441426420b (git)
Affected: 34e37b4c432cd0f1842b352fde4b8878b4166888 , < 0cab687205986491302cd2e440ef1d253031c221 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.80 , ≤ 6.1.* (semver)
Unaffected: 6.6.19 , ≤ 6.6.* (semver)
Unaffected: 6.7.7 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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