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nvdimm/btt: reject an arena whose nfree is below the lane count

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.

Announced Source revision 1
Original source ↗

CVE-2026-89965

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-2026-89965

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": [
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "eb491343d2d1784121ad9af91c25b338c28913c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "59d5cd1f42b4bab3609512c3cb3d3540d3d21da7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "f6c5313aae794ecca8f762c1a3493de5c266f120",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "f9bf05c63b77d000e9c01f3e47af36973887d350",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "6f79d1a5f2611a3d36e9312be5425cd9cb397c51",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "6b1faf1f099f7060b5f1f2f0d024132581f1726e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "9dfa11cef4750b67591307f2c62e47a23d60e4b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
        "lessThan": "6a1f2e5ed9267ca19187038ac635393c165213ac",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/nvdimm/btt.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/nvdimm/btt.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89965

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36404 · Revision 1
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Publisher date
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