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dm array: reject an array block whose value size is not the caller's

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: dm array: reject an array block whose value size is not the caller's array_block_check() can only compare the header against itself, so a block with value_size 4 and max_entries 1018 is internally consistent and passes. dm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the roots for both live in the superblock. Point the mappings root at a hint block and __load_mappings() walks it through an info whose value size is 8, so element_at() strides 8 bytes over 4-byte entries and reaches offset 8160 of a 4096-byte block. get_ablock() and __shadow_ablock() are the two places that hold the block and the caller at once. Reject there when the two value sizes disagree. Arrays only ever read their own blocks, so this fires on crafted metadata only.

Announced Source revision 1
Original source ↗

CVE-2026-89573

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-2026-89573

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": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "35cd3b278448c79614f65ab6bbc9ed348d847df9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "a8237cb8fa0a628d903e76635bfdeae4202036b9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "a530a9a419a7c5fdb7dae55ffa2dd7a130631842",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "522fa26da24ccaa298ebe3c1c97395d2d63dfc21",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "ac4a5eb8b002a0742c938fc98b922e243f53573a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "cb409b38b0232ee4385ef55cddcd6fbdd011a8a2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
        "lessThan": "4538a287bdf5d0f9a379c678e5262b9f5783f547",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/md/persistent-data/dm-array.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.9",
        "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": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/md/persistent-data/dm-array.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89573

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35083 · Revision 1
Added to Heist Feed
Publisher date
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