CVE-2026-89570cxl/mce: Make the MCE notifier per-region
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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) ]
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 516e5bd0b6bf4ae1ad072df637b428a737c3c870 before 5563db13c9528a56c7161260ec75ec8690dc5608; 516e5bd0b6bf4ae1ad072df637b428a737c3c870 builds before 491d8c9ac98d55073bda778f88a5248d4cce3fa0; from 516e5bd0b6bf4ae1ad072df637b428a737c3c870 before 775d0f4558f4cec0ee0c8966595d1add1791f36e | CNA record |
References
- https://git.kernel.org/stable/c/5563db13c9528a56c7161260ec75ec8690dc5608
- https://git.kernel.org/stable/c/491d8c9ac98d55073bda778f88a5248d4cce3fa0
- https://git.kernel.org/stable/c/775d0f4558f4cec0ee0c8966595d1add1791f36e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.