CVE-2026-74365 json
nvdimm/btt: Handle preemption in BTT lane acquisition
published 2026-08-15 2 mo ago modified 2026-10-16 23 d ago also EUVD-2026-59512
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 2%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 4.20, 5.5, 5.11, 5.16, 6.1.178, 6.6, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
- linux Debian 12 6.1.180-1
- linux Debian 13 6.12.100-1
- linux Debian 14 7.1.5-1
debian advisories DEBIAN-CVE-2026-74365
- linux Ubuntu 24.04 LTS 6.8.0-147.147
- linux Ubuntu 26.04 LTS 7.0.0-38.38
- linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
- linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
- linux-gcp Ubuntu 26.04 LTS 7.0.0-1014.14
- linux-gke Ubuntu 24.04 LTS 6.8.0-1066.74
- linux-gke Ubuntu 26.04 LTS 7.0.0-1008.9
ubuntu advisories UBUNTU-CVE-2026-74365
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
- kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
- kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1.150700.17.47.1
suse advisories SUSE-SU-2026:4706-1SUSE-SU-2026:4640-1SUSE-SU-2026:24316-1SUSE-SU-2026:24315-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.39.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-azure openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.39.1
opensuse advisories openSUSE-SU-2026:22091-1
- git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735 commit
- git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506 commit
- git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd commit
- git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50 commit
- git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f commit
- git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-74365 updated cvss 6.1
kernel: nvdimm/btt: Handle preemption in BTT lane acquisition
-
Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more Red Hat Enterprise Linux 10 kernelaffected: workaround, no fix available “Fix deferred”
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-selftests-internalnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 23 d ago
Exploit prediction
0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735
- git.kernel.org /stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506
- git.kernel.org /stable/c/417918783bcfe0be135019df16a267b3af442efd
- git.kernel.org /stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50
- git.kernel.org /stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f
- git.kernel.org /stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e
Sources
- CVE List CVE-2026-74365
- NVD CVE-2026-74365
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.