cxl/mce: Make the MCE notifier per-region

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Summary

CVECVE-2026-89570
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:41 UTC
Updated2026-09-11 20:19:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cxl/mce: Make the MCE notifier per-region Flavien Solt reported lifetime issues with the CXL MCE notifier, which can lead to NULL dereferences and use-after-free in the MCE handler. The notifier was registered per memory device and stored in 'struct cxl_memdev_state', even though it only needs the region state (the region's SPA range and its extended linear cache size). Instead of keeping the memory device and endpoint alive, the correct fix is to move the notifier into 'struct cxl_region' and register it from cxl_region_probe() as it should be a per-region notifier. Setup the registration to only happen for regions that have an extended linear cache as that is the only current usage. Remove cxl_port_get_spa_cache_alias() as it is now dead code. [ dj: Update dev_warn() when notifier fails due to kconfig. (Ben) ]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 516e5bd0b6bf4ae1ad072df637b428a737c3c870 5563db13c9528a56c7161260ec75ec8690dc5608 git Not specified
CNA Linux Linux affected 516e5bd0b6bf4ae1ad072df637b428a737c3c870 491d8c9ac98d55073bda778f88a5248d4cce3fa0 git Not specified
CNA Linux Linux affected 516e5bd0b6bf4ae1ad072df637b428a737c3c870 775d0f4558f4cec0ee0c8966595d1add1791f36e git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5563db13c9528a56c7161260ec75ec8690dc5608 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/491d8c9ac98d55073bda778f88a5248d4cce3fa0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/775d0f4558f4cec0ee0c8966595d1add1791f36e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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