CVE-2026-74365High· 7.3▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: Handle preemption in BTT lane acquisition BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test repor…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
nvdimm/btt: Handle preemption in BTT lane acquisition
BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test reports data mismatches during BTT writes due to a race in lane acquisition that can lead to silent data corruption.
The existing lane model uses a spinlock together with a per-CPU recursion count. That recursion model stopped being valid after BTT lanes became preemptible: another task can run on the same CPU, observe a non-zero recursion count, bypass locking, and use the same lane concurrently.
BTT lanes are also held across arena_write_bytes() calls. That path reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush(). Some provider flush callbacks can sleep, making a spinlock the wrong primitive for the lane lifetime.
Replace the spinlock-based recursion model with a dynamically allocated per-lane mutex array and take the lane lock unconditionally.
Add might_sleep() to catch any future atomic-context caller.
Found with the ndctl unit test btt-check.sh.
Linux >= f23859748e3d530217b197e146a9ac84faf0a282 < fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735Linux >= 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 < 73e35c1bdfa160b41fdbe204e02325f0687de506Linux >= 36c75ce3bd299878fd9b238e9803d3817ddafbf3 < 417918783bcfe0be135019df16a267b3af442efdLinux >= 36c75ce3bd299878fd9b238e9803d3817ddafbf3 < 5c53406098b599c420b031e6ec5ba8a2f3794c50Linux >= 36c75ce3bd299878fd9b238e9803d3817ddafbf3 < 4eafa810b042d985ec6bbf5b514414e73cee6f6fLinux >= 36c75ce3bd299878fd9b238e9803d3817ddafbf3 < 8d4b989d9c9afe5f185aa5853b666fc4617afe9eLinux 2577fece583c7c05cda7ad50dde7638c962665e1Linux 40ba3fa21250e361bdd8f00800b3e2cb6160de95Linux b0e7a935739f33ed2bd6868b89f97dd4c2683c26Linux 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5Linux b27751fb1f271bbb78d5993c0b10011628e40e18Linux >= 6.1.63 < 6.1.178Linux >= 6.6.2 < 6.6.145Linux >= 4.19.299 < 4.20Linux >= 5.4.261 < 5.5Linux >= 5.10.201 < 5.11Linux >= 5.15.139 < 5.16Linux >= 6.5.12 < 6.6Linux 6.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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