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CVE-2026-74365 (GCVE-0-2026-74365)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
Title
nvdimm/btt: Handle preemption in BTT lane acquisition
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.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f23859748e3d530217b197e146a9ac84faf0a282 , < fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735 (git)
Affected: 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 , < 73e35c1bdfa160b41fdbe204e02325f0687de506 (git)
Affected: 36c75ce3bd299878fd9b238e9803d3817ddafbf3 , < 417918783bcfe0be135019df16a267b3af442efd (git)
Affected: 36c75ce3bd299878fd9b238e9803d3817ddafbf3 , < 5c53406098b599c420b031e6ec5ba8a2f3794c50 (git)
Affected: 36c75ce3bd299878fd9b238e9803d3817ddafbf3 , < 4eafa810b042d985ec6bbf5b514414e73cee6f6f (git)
Affected: 36c75ce3bd299878fd9b238e9803d3817ddafbf3 , < 8d4b989d9c9afe5f185aa5853b666fc4617afe9e (git)
Affected: 2577fece583c7c05cda7ad50dde7638c962665e1 (git)
Affected: 40ba3fa21250e361bdd8f00800b3e2cb6160de95 (git)
Affected: b0e7a935739f33ed2bd6868b89f97dd4c2683c26 (git)
Affected: 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5 (git)
Affected: b27751fb1f271bbb78d5993c0b10011628e40e18 (git)
Affected: 6.1.63 , < 6.1.178 (semver)
Affected: 6.6.2 , < 6.6.145 (semver)
Affected: 4.19.299 , < 4.20 (semver)
Affected: 5.4.261 , < 5.5 (semver)
Affected: 5.10.201 , < 5.11 (semver)
Affected: 5.15.139 , < 5.16 (semver)
Affected: 6.5.12 , < 6.6 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm/btt: Handle preemption in BTT lane acquisition\n\nBTT lanes serialize access to per-lane metadata and workspace state\nduring BTT I/O. The btt-check unit test reports data mismatches during\nBTT writes due to a race in lane acquisition that can lead to silent\ndata corruption.\n\nThe existing lane model uses a spinlock together with a per-CPU\nrecursion count. That recursion model stopped being valid after BTT\nlanes became preemptible: another task can run on the same CPU,\nobserve a non-zero recursion count, bypass locking, and use the same\nlane concurrently.\n\nBTT lanes are also held across arena_write_bytes() calls. That path\nreaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().\nSome provider flush callbacks can sleep, making a spinlock the wrong\nprimitive for the lane lifetime.\n\nReplace the spinlock-based recursion model with a dynamically\nallocated per-lane mutex array and take the lane lock\nunconditionally.\n\nAdd might_sleep() to catch any future atomic-context caller.\n\nFound with the ndctl unit test btt-check.sh."
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              "value": "AV:L - The flaw is reached only through local block I/O on a BTT-backed /dev/pmem* device via vfs_write/pwrite/O_DIRECT paths into btt_submit_bio-\u003ebtt_write_pg/btt_read_pg-\u003end_region_acquire_lane; it is not in a network protocol handler.\nAC:L - After BTT lanes became preemptible, a second task on the same CPU can bypass the per-CPU recursion spinlock while the first still holds the lane across sleeping arena_write_bytes/nvdimm_flush; an attacker reliably wins by issuing concurrent writes (e.g., many threads) to the BTT block device.\nPR:L - No capability checks exist on the bio submission path; any local principal with write access to the BTT block device or a filesystem mounted on it (common for database/service accounts on PMEM servers) can trigger the race without real init-namespace root.\nUI:N - Exploitation requires only automated concurrent block writes from the attacker-controlled process and does not depend on any victim user opening files, clicking prompts, or performing other interactive actions.\nS:U - Impact is confined to corrupting BTT metadata and data within the attacker\u0027s reachable persistent-memory namespace on the same host; it does not cross VM, container, or IOMMU security boundaries to affect other security authorities.\nC:H - Unserialized lane use corrupts BTT map/log/freelist and in-memory arena-\u003ertt/freelist state, so reads can return stale or mis-mapped sector contents (cross-LBA disclosure); the ndctl btt-check test observed data mismatches confirming readable integrity loss.\nI:H - Concurrent writers can silently corrupt on-media BTT translation tables and user data blocks, producing arbitrary persistent storage modification rather than a bounded or detectable single-field change, matching the fix commit\u0027s silent data-corruption description.\nA:L - The primary failure mode is silent corruption and subsequent I/O errors on the affected namespace rather than a kernel panic or hang, but corrupted BTT metadata can persistently degrade or deny reliable access to the volume until recovery or rebuild."
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      "title": "nvdimm/btt: Handle preemption in BTT lane acquisition",
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    "cveId": "CVE-2026-74365",
    "datePublished": "2026-08-15T05:58:47.594Z",
    "dateReserved": "2026-08-15T05:44:03.888Z",
    "dateUpdated": "2026-08-17T05:46:24.251Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74365",
      "date": "2026-09-04",
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That recursion model stopped being valid after BTT\\nlanes became preemptible: another task can run on the same CPU,\\nobserve a non-zero recursion count, bypass locking, and use the same\\nlane concurrently.\\n\\nBTT lanes are also held across arena_write_bytes() calls. That path\\nreaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().\\nSome provider flush callbacks can sleep, making a spinlock the wrong\\nprimitive for the lane lifetime.\\n\\nReplace the spinlock-based recursion model with a dynamically\\nallocated per-lane mutex array and take the lane lock\\nunconditionally.\\n\\nAdd might_sleep() to catch any future atomic-context caller.\\n\\nFound with the ndctl unit test btt-check.sh.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"Documentation/driver-api/nvdimm/btt.rst\",\"drivers/nvdimm/nd.h\",\"drivers/nvdimm/region_devs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f23859748e3d530217b197e146a9ac84faf0a282\",\"lessThan\":\"fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f50b414f1a0d790f11a6438a3ad6d0577eb2c18\",\"lessThan\":\"73e35c1bdfa160b41fdbe204e02325f0687de506\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36c75ce3bd299878fd9b238e9803d3817ddafbf3\",\"lessThan\":\"417918783bcfe0be135019df16a267b3af442efd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36c75ce3bd299878fd9b238e9803d3817ddafbf3\",\"lessThan\":\"5c53406098b599c420b031e6ec5ba8a2f3794c50\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36c75ce3bd299878fd9b238e9803d3817ddafbf3\",\"lessThan\":\"4eafa810b042d985ec6bbf5b514414e73cee6f6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36c75ce3bd299878fd9b238e9803d3817ddafbf3\",\"lessThan\":\"8d4b989d9c9afe5f185aa5853b666fc4617afe9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2577fece583c7c05cda7ad50dde7638c962665e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40ba3fa21250e361bdd8f00800b3e2cb6160de95\",\"versionType\":\"git\",\"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\",\"status\":\"affected\"},{\"version\":\"5.4.261\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"Documentation/driver-api/nvdimm/btt.rst\",\"drivers/nvdimm/nd.h\",\"drivers/nvdimm/region_devs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":1.8,\"impactScore\":5.5}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T20:53:20+00:00",
      "cve": "CVE-2026-74365",
      "id": "CVE-2026-74365",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvdimm/btt: Handle preemption in BTT lane acquisition",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74365.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.