CVE-2026-74365nvdimm/btt: Handle preemption in BTT lane acquisition
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: 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.
- CVSS
- 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- 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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f23859748e3d530217b197e146a9ac84faf0a282 before fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735; from 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 before 73e35c1bdfa160b41fdbe204e02325f0687de506; from 36c75ce3bd299878fd9b238e9803d3817ddafbf3 before 417918783bcfe0be135019df16a267b3af442efd; 36c75ce3bd299878fd9b238e9803d3817ddafbf3 builds before 5c53406098b599c420b031e6ec5ba8a2f3794c50; 36c75ce3bd299878fd9b238e9803d3817ddafbf3 builds before 4eafa810b042d985ec6bbf5b514414e73cee6f6f; 36c75ce3bd299878fd9b238e9803d3817ddafbf3 builds before 8d4b989d9c9afe5f185aa5853b666fc4617afe9e; 2577fece583c7c05cda7ad50dde7638c962665e1; 40ba3fa21250e361bdd8f00800b3e2cb6160de95; and 10 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735
- https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506
- https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd
- https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50
- https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f
- https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e
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.