High

CVE-2026-74365 — nvdimm/btt: Handle preemption in BTT lane acquisition

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.

Published Aug 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

7.3

High · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5version 6.7≥ 6.5.12 and < 6.6≥ 5.15.139 and < 5.16≥ 5.10.201 and < 5.11≥ 5.4.261 and < 5.5≥ 4.19.299 and < 4.20≥ 6.6.2 and < 6.6.145 and 11 more ≥ 6.1.63 and < 6.1.178version b27751fb1f271bbb78d5993c0b10011628e40e18≥ f23859748e3d530217b197e146a9ac84faf0a282 and < fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735version b0e7a935739f33ed2bd6868b89f97dd4c2683c26version 40ba3fa21250e361bdd8f00800b3e2cb6160de95version 2577fece583c7c05cda7ad50dde7638c962665e1≥ 36c75ce3bd299878fd9b238e9803d3817ddafbf3 and < 8d4b989d9c9afe5f185aa5853b666fc4617afe9e≥ 36c75ce3bd299878fd9b238e9803d3817ddafbf3 and < 4eafa810b042d985ec6bbf5b514414e73cee6f6f≥ 36c75ce3bd299878fd9b238e9803d3817ddafbf3 and < 5c53406098b599c420b031e6ec5ba8a2f3794c50≥ 36c75ce3bd299878fd9b238e9803d3817ddafbf3 and < 417918783bcfe0be135019df16a267b3af442efd≥ 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 and < 73e35c1bdfa160b41fdbe204e02325f0687de506	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.3	CVSS 3.1	High	1.8	5.5	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.3	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.3
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 15, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

6 on the record

git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50
NIST National Vulnerability Database
git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f
NIST National Vulnerability Database
git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e
NIST National Vulnerability Database
git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506
NIST National Vulnerability Database
git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd
NIST National Vulnerability Database
git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 14h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 14h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-74365 is "nvdimm/btt: Handle preemption in BTT lane acquisition", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.3 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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