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.
CVE-2026-74365
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74365
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "f23859748e3d530217b197e146a9ac84faf0a282",
"lessThan": "fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735",
"versionType": "git"
},
{
"status": "affected",
"version": "6f50b414f1a0d790f11a6438a3ad6d0577eb2c18",
"lessThan": "73e35c1bdfa160b41fdbe204e02325f0687de506",
"versionType": "git"
},
{
"status": "affected",
"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
"lessThan": "417918783bcfe0be135019df16a267b3af442efd",
"versionType": "git"
},
{
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"versionType": "git"
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{
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{
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"lessThan": "8d4b989d9c9afe5f185aa5853b666fc4617afe9e",
"versionType": "git"
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "b0e7a935739f33ed2bd6868b89f97dd4c2683c26",
"versionType": "git"
},
{
"status": "affected",
"version": "66eb7b7f23dd9aec5356e7054dd3596ae7648ff5",
"versionType": "git"
},
{
"status": "affected",
"version": "b27751fb1f271bbb78d5993c0b10011628e40e18",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.63",
"lessThan": "6.1.178",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.2",
"lessThan": "6.6.145",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.299",
"lessThan": "4.20",
"versionType": "semver"
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{
"status": "affected",
"version": "5.4.261",
"lessThan": "5.5",
"versionType": "semver"
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{
"status": "affected",
"version": "5.10.201",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.139",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.5.12",
"lessThan": "6.6",
"versionType": "semver"
}
],
"programFiles": [
"Documentation/driver-api/nvdimm/btt.rst",
"drivers/nvdimm/nd.h",
"drivers/nvdimm/region_devs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
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{
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"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
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"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"Documentation/driver-api/nvdimm/btt.rst",
"drivers/nvdimm/nd.h",
"drivers/nvdimm/region_devs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74365
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33111 · Revision 1
- Added to Heist Feed
- Publisher date