Vulnerability-Lookup

GHSA-9FC3-H9FC-Q4XW

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31

Details

In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation

Use the descriptor's ep_mem_offset to calculate the start of the endpoint memory access array and to comply with the FF-A spec instead of defaulting to sizeof(struct ffa_mem_region). This requires moving ffa_mem_region_additional_setup() earlier in the setup flow. Also, add sanity checks to ensure the calculated descriptor offsets do not exceed max_fragsize.

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-2026-68400"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:33Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation\n\nUse the descriptor\u0027s `ep_mem_offset` to calculate the start of the endpoint\nmemory access array and to comply with the FF-A spec instead of defaulting\nto `sizeof(struct ffa_mem_region)`.\nThis requires moving `ffa_mem_region_additional_setup()` earlier in the setup\nflow.\nAlso, add sanity checks to ensure the calculated descriptor offsets do not\nexceed `max_fragsize`.",
  "id": "GHSA-9fc3-h9fc-q4xw",
  "modified": "2026-08-14T00:31:58Z",
  "published": "2026-08-10T15:33:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68400"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ef18f0ab3c0ec1eac77289f5a542bd96a8a6d66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b39b08e6bee812514b449dc874076890e6b871a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4d961351aa84fdf0148783fb1f3a1391b8a0adb"
    }
  ],
  "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-2026-68400 (GCVE-0-2026-68400)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04

Title

firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation

Summary

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation Use the descriptor's `ep_mem_offset` to calculate the start of the endpoint memory access array and to comply with the FF-A spec instead of defaulting to `sizeof(struct ffa_mem_region)`. This requires moving `ffa_mem_region_additional_setup()` earlier in the setup flow. Also, add sanity checks to ensure the calculated descriptor offsets do not exceed `max_fragsize`.

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 Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b39b08e6bee812514…
https://git.kernel.org/stable/c/8ef18f0ab3c0ec1ea…
https://git.kernel.org/stable/c/b4d961351aa84fdf0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 113580530ee7dc61e668b641d657920734533b9f , < b39b08e6bee812514b449dc874076890e6b871a0 (git) Affected: 113580530ee7dc61e668b641d657920734533b9f , < 8ef18f0ab3c0ec1eac77289f5a542bd96a8a6d66 (git) Affected: 113580530ee7dc61e668b641d657920734533b9f , < b4d961351aa84fdf0148783fb1f3a1391b8a0adb (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_ffa/driver.c",
            "include/linux/arm_ffa.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b39b08e6bee812514b449dc874076890e6b871a0",
              "status": "affected",
              "version": "113580530ee7dc61e668b641d657920734533b9f",
              "versionType": "git"
            },
            {
              "lessThan": "8ef18f0ab3c0ec1eac77289f5a542bd96a8a6d66",
              "status": "affected",
              "version": "113580530ee7dc61e668b641d657920734533b9f",
              "versionType": "git"
            },
            {
              "lessThan": "b4d961351aa84fdf0148783fb1f3a1391b8a0adb",
              "status": "affected",
              "version": "113580530ee7dc61e668b641d657920734533b9f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_ffa/driver.c",
            "include/linux/arm_ffa.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation\n\nUse the descriptor\u0027s `ep_mem_offset` to calculate the start of the endpoint\nmemory access array and to comply with the FF-A spec instead of defaulting\nto `sizeof(struct ffa_mem_region)`.\nThis requires moving `ffa_mem_region_additional_setup()` earlier in the setup\nflow.\nAlso, add sanity checks to ensure the calculated descriptor offsets do not\nexceed `max_fragsize`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable FF-A memory-descriptor setup is reached only through local kernel interfaces \u2014 TEE device ioctls (/dev/tee*) driving optee/tstee shared-memory registration and lend paths, or host-side FF-A SMC handling. No network or remote packet input reaches this code.\nAC:L - The out-of-bounds descriptor writes follow deterministically from the endpoint count and offsets used to build the transaction; no race, no memory-layout luck, and no condition outside the attacker\u0027s influence is needed to drive the unvalidated offset arithmetic past max_fragsize.\nPR:L - An unprivileged local process holding a handle to the TEE device node (common on Android/embedded ARM systems, where TEE clients are ordinary user processes) can drive ffa_setup_and_transmit() via shared-memory registration/lend operations; no root or capability check gates that path.\nUI:N - The vulnerable path is entered directly from the attacker\u0027s own ioctl/FF-A operations; no action by another user or administrator is required.\nS:U - The out-of-bounds writes corrupt kernel memory adjacent to the FF-A TX buffer within the same kernel security authority, so impact is scored as Unchanged even though the same offset confusion also feeds the pKVM/secure-world descriptor parsing.\nC:H - Descriptor offsets computed without validation against max_fragsize let structured data be placed and read back outside the intended buffer, and the resulting heap corruption is leverageable into disclosure of adjacent kernel memory, including data later handed to the secure world.\nI:H - This is an out-of-bounds write of attacker-influenced endpoint descriptor fields (receiver, attrs, composite_off, impdef values) plus a memset past the end of the TX buffer, giving heap corruption that can be groomed into a control-flow or data-structure overwrite primitive.\nA:H - Writing endpoint memory access descriptors beyond the RX/TX buffer corrupts unrelated kernel allocations and readily produces an oops or panic, and the mis-parsed descriptor can also drive the memory transaction into an inconsistent state with the secure partition."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:48.935Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b39b08e6bee812514b449dc874076890e6b871a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ef18f0ab3c0ec1eac77289f5a542bd96a8a6d66"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4d961351aa84fdf0148783fb1f3a1391b8a0adb"
        }
      ],
      "title": "firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68400",
    "datePublished": "2026-08-10T12:04:19.952Z",
    "dateReserved": "2026-07-30T09:28:09.389Z",
    "dateUpdated": "2026-08-17T05:04:48.935Z",
    "state": "PUBLISHED"
  },
  "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.

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.
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GHSA-9FC3-H9FC-Q4XW

CVE-2026-68400 (GCVE-0-2026-68400)

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