Vulnerability-Lookup

GHSA-JX3V-9V24-F367

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31

Details

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.

Severity

8.0 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89954"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:05Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-jx3v-9v24-f367",
  "modified": "2026-09-16T15:31:03Z",
  "published": "2026-09-16T12:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89954"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-89954 (GCVE-0-2026-89954)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:40

Title

mtd: afs: validate v2 image info bounds

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.

Severity

8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1bec05a68414cf8d0…
https://git.kernel.org/stable/c/3ad8ff12fd44b08af…
https://git.kernel.org/stable/c/875daa3c750814ff2…
https://git.kernel.org/stable/c/da740539e8f370767…
https://git.kernel.org/stable/c/1edea8900ca3e405c…
https://git.kernel.org/stable/c/18916f475057cbd2f…
https://git.kernel.org/stable/c/d14e6298139f58a87…
https://git.kernel.org/stable/c/e9290031f736e99ad…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < 1bec05a68414cf8d0cab6cb42445b8603f32ffc4 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < 3ad8ff12fd44b08af9212ac4883a7e29d2ab7348 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < 875daa3c750814ff2e2dc050239c390048f0bcd0 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < da740539e8f370767317e24615349b9342a6e773 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < 1edea8900ca3e405c1421d8b5c29f97107874f72 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < 18916f475057cbd2fb8ea6ae86e6b85884ad1d53 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < d14e6298139f58a87a87d7022e26a7f37f0ddce7 (git) Affected: b7cf5e2830bbb128699d7635ce8404b7f605bc95 , < e9290031f736e99ad17c25c00311c92c266843b7 (git)
Linux	Linux	Affected: 5.2 Unaffected: 0 , < 5.2 (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: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

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{
  "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",
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            {
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            },
            {
              "lessThan": "875daa3c750814ff2e2dc050239c390048f0bcd0",
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              "versionType": "git"
            },
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            },
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.2"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "vulnerable": true
                },
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                {
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                {
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          "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."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
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              "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": "2026-09-16T14:40:35.830Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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          "url": "https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773"
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        {
          "url": "https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7"
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      ],
      "title": "mtd: afs: validate v2 image info bounds",
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    "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": "2026-09-16T14:40:35.830Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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