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GHSA-PG3H-8QXX-35HJ

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89573"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:41Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-pg3h-8qxx-35hj",
  "modified": "2026-09-14T15:32:29Z",
  "published": "2026-09-11T21:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89573"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35cd3b278448c79614f65ab6bbc9ed348d847df9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4538a287bdf5d0f9a379c678e5262b9f5783f547"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/522fa26da24ccaa298ebe3c1c97395d2d63dfc21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a530a9a419a7c5fdb7dae55ffa2dd7a130631842"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8237cb8fa0a628d903e76635bfdeae4202036b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac4a5eb8b002a0742c938fc98b922e243f53573a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb409b38b0232ee4385ef55cddcd6fbdd011a8a2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-14 12:01

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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/35cd3b278448c7961…
https://git.kernel.org/stable/c/a8237cb8fa0a628d9…
https://git.kernel.org/stable/c/a530a9a419a7c5fdb…
https://git.kernel.org/stable/c/522fa26da24ccaa29…
https://git.kernel.org/stable/c/7bf4b5cb42a4e27f3…
https://git.kernel.org/stable/c/ac4a5eb8b002a0742…
https://git.kernel.org/stable/c/cb409b38b0232ee43…
https://git.kernel.org/stable/c/4538a287bdf5d0f9a…

Impacted products

2 products

Vendor	Product	Version
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)
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-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/persistent-data/dm-array.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "35cd3b278448c79614f65ab6bbc9ed348d847df9",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "a8237cb8fa0a628d903e76635bfdeae4202036b9",
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            },
            {
              "lessThan": "a530a9a419a7c5fdb7dae55ffa2dd7a130631842",
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            },
            {
              "lessThan": "522fa26da24ccaa298ebe3c1c97395d2d63dfc21",
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            },
            {
              "lessThan": "7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c",
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            },
            {
              "lessThan": "ac4a5eb8b002a0742c938fc98b922e243f53573a",
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
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            },
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              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "versionType": "git"
            }
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/md/persistent-data/dm-array.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "3.9",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.9",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
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            }
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      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:06.500Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/cb409b38b0232ee4385ef55cddcd6fbdd011a8a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/4538a287bdf5d0f9a379c678e5262b9f5783f547"
        }
      ],
      "title": "dm array: reject an array block whose value size is not the caller\u0027s",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89573",
    "datePublished": "2026-09-11T19:44:41.851Z",
    "dateReserved": "2026-09-11T19:38:34.727Z",
    "dateUpdated": "2026-09-14T12:01:06.500Z",
    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.