CVE-2026-89954 (GCVE-0-2026-89954)
Vulnerability from cvelistv5
Published
2026-09-16 10:32
Modified
2026-10-19 08:55
Severity ?
8.0 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: afs: validate v2 image info bounds The AFS v2 parser uses footer[8] to locate the image information block inside the current erase block, then uses the image information region_count to walk entries from a fixed local array. The footer offset and region count come from flash contents and are not checked against the erase block or the local image-info array before use. Reject v2 entries whose image information offset would underflow the erase block calculation, and reject region counts that cannot fit in the local image-info array before walking region entries.
References
Impacted products
Vendor Product Version
Linux Linux Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
Version: b7cf5e2830bbb128699d7635ce8404b7f605bc95
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/parsers/afs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1bec05a68414cf8d0cab6cb42445b8603f32ffc4",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "3ad8ff12fd44b08af9212ac4883a7e29d2ab7348",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "875daa3c750814ff2e2dc050239c390048f0bcd0",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "da740539e8f370767317e24615349b9342a6e773",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "1edea8900ca3e405c1421d8b5c29f97107874f72",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "18916f475057cbd2fb8ea6ae86e6b85884ad1d53",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "d14e6298139f58a87a87d7022e26a7f37f0ddce7",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            },
            {
              "lessThan": "e9290031f736e99ad17c25c00311c92c266843b7",
              "status": "affected",
              "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/parsers/afs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "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": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: afs: validate v2 image info bounds\n\nThe AFS v2 parser uses footer[8] to locate the image information block\ninside the current erase block, then uses the image information\nregion_count to walk entries from a fixed local array. The footer offset\nand region count come from flash contents and are not checked against the\nerase block or the local image-info array before use.\n\nReject v2 entries whose image information offset would underflow the\nerase block calculation, and reject region counts that cannot fit in the\nlocal image-info array before walking region entries."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The AFS v2 parser runs from parse_mtd_partitions() during local MTD/physmap probe, reading on-flash ARM Firmware Suite footers via mtd_read(); no network protocol, Bluetooth/Wi-Fi path, or USB gadget/host handler invokes this code.\nAC:L - An attacker who controls the flash image can plant valid AFS v2 magic and CRC and set footer[8] and region_count arbitrarily, so the unsigned info-block offset and the region walk run deterministically with no race or layout condition outside attacker control.\nPR:N - parse_afs_partitions() runs automatically at boot/probe on affected ARM/physmap systems with no credential or capability check; crafted AFS metadata can be delivered in firmware/OTA/supply-chain flash contents without a local OS account.\nUI:N - Partition parsing runs as part of MTD driver initialization at boot or bind; no separate victim action such as mounting a filesystem or opening a device node is required.\nS:U - The stack over-read and any resulting oops remain inside the host kernel; this is not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - Attacker-controlled region_count drives an unbounded read past the on-stack imginfo[36] array, and kstrdup() of a possibly non-NUL-terminated footer name can copy that kernel stack/adjacent memory into a partition name far beyond a small bounded leak.\nI:L - OOB-derived region offset/size and repeated kstrdup() results are stored in the registered mtd_partition object, modifying kernel flash-layout metadata, but the loop does not perform an out-of-bounds write or yield a control-flow hijack primitive.\nA:H - Walking region_count past imginfo[] reaches unmapped stack or vmalloc pages and oopses or panics the kernel; a huge count can also livelock probe and exhaust memory via kstrdup in the loop."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:55:28.240Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348"
        },
        {
          "url": "https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773"
        },
        {
          "url": "https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72"
        },
        {
          "url": "https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53"
        },
        {
          "url": "https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7"
        }
      ],
      "title": "mtd: afs: validate v2 image info bounds",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89954",
    "datePublished": "2026-09-16T10:32:38.355Z",
    "dateReserved": "2026-09-11T19:38:34.777Z",
    "dateUpdated": "2026-10-19T08:55:28.240Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.