CVE-2026-74365: Linux Vulnerability (CVSS 7.3)

Description

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.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

EPSS Probability

0.18%

7.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 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
Linux	Linux	6.7

References

Timeline

Published: Aug 15, 2026
Last Modified: Aug 17, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-74365?

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.

How severe is CVE-2026-74365?

CVE-2026-74365 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-74365?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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