Answer in brief
CVE-2026-74365 records a High severity (CVSS 7.3) vulnerability in nvdimm/btt: Handle preemption in BTT lane acquisition. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f23859748e3d530217b197e146a9ac84faf0a282 <fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735 || >=6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 <73e35c1bdfa160b41fdbe204e02325f0687de506 || >=36c75ce3bd299878fd9b238e9803d3817ddafbf3 <417918783bcfe0be135019df16a267b3af442efd || >=36c75ce3bd299878fd9b238e9803d3817ddafbf3 <5c53406098b599c420b031e6ec5ba8a2f3794c50 || >=36c75ce3bd299878fd9b238e9803d3817ddafbf3 <4eafa810b042d985ec6bbf5b514414e73cee6f6f || >=36c75ce3bd299878fd9b238e9803d3817ddafbf3 <8d4b989d9c9afe5f185aa5853b666fc4617afe9e || 2577fece583c7c05cda7ad50dde7638c962665e1 || 40ba3fa21250e361bdd8f00800b3e2cb6160de95 || b0e7a935739f33ed2bd6868b89f97dd4c2683c26 || 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5 || b27751fb1f271bbb78d5993c0b10011628e40e18 || >=6.1.63 <6.1.178 || >=6.6.2 <6.6.145 || >=4.19.299 <4.20 || >=5.4.261 <5.5 || >=5.10.201 <5.11 || >=5.15.139 <5.16 || >=6.5.12 <6.6 | fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735, 73e35c1bdfa160b41fdbe204e02325f0687de506, 417918783bcfe0be135019df16a267b3af442efd, 5c53406098b599c420b031e6ec5ba8a2f3794c50, 4eafa810b042d985ec6bbf5b514414e73cee6f6f, 8d4b989d9c9afe5f185aa5853b666fc4617afe9e, 6.1.178, 6.6.145, 4.20, 5.5, 5.11, 5.16, 6.6 |
| Linux/Linuxgeneric | 6.7 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.