CVE-2026-89573 (GCVE-0-2026-89573)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:49
VLAI
Title
dm array: reject an array block whose value size is not the caller's
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:24 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < 35cd3b278448c79614f65ab6bbc9ed348d847df9 (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < a8237cb8fa0a628d903e76635bfdeae4202036b9 (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < a530a9a419a7c5fdb7dae55ffa2dd7a130631842 (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < 522fa26da24ccaa298ebe3c1c97395d2d63dfc21 (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < 7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < ac4a5eb8b002a0742c938fc98b922e243f53573a (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < cb409b38b0232ee4385ef55cddcd6fbdd011a8a2 (git)
Affected: 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 , < 4538a287bdf5d0f9a379c678e5262b9f5783f547 (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm array: reject an array block whose value size is not the caller\u0027s\n\narray_block_check() can only compare the header against itself, so a block\nwith value_size 4 and max_entries 1018 is internally consistent and passes.\ndm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the\nroots for both live in the superblock. Point the mappings root at a hint\nblock and __load_mappings() walks it through an info whose value size is 8,\nso element_at() strides 8 bytes over 4-byte entries and reaches offset 8160\nof a 4096-byte block.\n\nget_ablock() and __shadow_ablock() are the two places that hold the block\nand the caller at once. Reject there when the two value sizes disagree.\nArrays only ever read their own blocks, so this fires on crafted metadata\nonly."
          }
        ],
        "id": "CVE-2026-89573",
        "lastModified": "2026-10-19T09:17:53.203",
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                "confidentialityImpact": "HIGH",
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                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "published": "2026-09-11T20:19:41.390",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:35:49+00:00",
      "cve": "CVE-2026-89573",
      "id": "CVE-2026-89573",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm array: reject an array block whose value size is not the caller\u0027s",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89573.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T16:25:12Z",
      "cve": "CVE-2026-89573",
      "id": "CVE-2026-89573",
      "initial_release_date": "2026-09-12T16:25:50Z",
      "product_status:known_affected": "350",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89573",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89573.json",
      "version": "6"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-89573",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:24:23.066783Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T19:24:24.319Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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                {
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                  "version": "0",
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                  "version": "5.15.221",
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                  "version": "6.1.188",
                  "versionType": "semver"
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                  "version": "6.6.157",
                  "versionType": "semver"
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                  "version": "6.12.109",
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                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "7.3",
                  "versionType": "original_commit_for_fix"
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            }
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm array: reject an array block whose value size is not the caller\u0027s\n\narray_block_check() can only compare the header against itself, so a block\nwith value_size 4 and max_entries 1018 is internally consistent and passes.\ndm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the\nroots for both live in the superblock. Point the mappings root at a hint\nblock and __load_mappings() walks it through an info whose value size is 8,\nso element_at() strides 8 bytes over 4-byte entries and reaches offset 8160\nof a 4096-byte block.\n\nget_ablock() and __shadow_ablock() are the two places that hold the block\nand the caller at once. Reject there when the two value sizes disagree.\nArrays only ever read their own blocks, so this fires on crafted metadata\nonly."
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                "baseSeverity": "HIGH",
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                  "lang": "en",
                  "value": "AV:L - The bug is reached when device-mapper loads crafted dm-cache/dm-era array metadata through the local DM ioctl path (table load and resume) or LVM autoactivation of a cache/era target; it is not processed from network packets or a USB host/gadget driver.\nAC:L - The attacker fully controls the on-disk superblock roots and array headers, so pointing the 8-byte mappings root at a valid 4-byte hint block makes __load_mappings() deterministically stride off the 4096-byte bufio buffer; no race or layout outside the attacker\u0027s control is required.\nPR:L - Planting the metadata only requires write access to the cache/era backing store (loop file, removable disk, iSCSI/NBD, or a container/VM-exposed block device), not init-namespace CAP_SYS_ADMIN on /dev/mapper/control; user namespaces cannot pass capable(CAP_SYS_ADMIN), but an unprivileged writer of that store is enough.\nUI:N - Activation of a dm-cache/dm-era target is routine device management (udev/LVM autoactivation, boot, or reattachment of the metadata device) and does not require a separate victim to mount a filesystem or otherwise opt in once the crafted metadata is in place.\nS:U - The out-of-bounds access stays inside kernel dm-bufio metadata buffers and cache policy state in the same kernel security authority; it is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - element_at() multiplies the caller\u0027s value size by the on-disk nr_entries, so the cursor reads thousands of bytes past the 4K dm-bufio page (offset 8160 of a 4096-byte block), leaking adjacent kernel memory into mapping, hint, and bitset values.\nI:H - The type-confused walk treats attacker-controlled hint bytes as 8-byte mappings and can shadow/fill the wrong-sized block, corrupting cache policy and subsequent origin/cache writeback; this is kernel memory unsafety with an out-of-bounds/type-confused write primitive, so integrity is high.\nA:H - Walking off the mapped 4K bufio page into unmapped or invalid memory oopses the kernel, and a mismatched on-disk nr_entries versus the caller\u0027s max_entries can hit BUG_ON() in fill_ablock()/trim_ablock() on resize."
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        "cveId": "CVE-2026-89573",
        "datePublished": "2026-09-11T19:44:41.851Z",
        "dateReserved": "2026-09-11T19:38:34.727Z",
        "dateUpdated": "2026-10-19T08:49:06.476Z",
        "state": "PUBLISHED"
      },
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  }
}



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Sightings

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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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