Vulnerability-Lookup

FKIE_CVE-2026-80748

Vulnerability from fkie_nvd - Published: 2026-09-03 13:06 - Updated: 2026-09-04 05:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: mmc: loongson2: Fix sg iteration in data reorder functions In ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(), the for_each_sg() macro already iterates over the scatterlist entries, with 'sg' pointing to the current entry. However, the code incorrectly uses '&sg[i]' and 'sg_dma_len(&sg[i])' inside the loop, which treats 'sg' as an array base and indexes it again, leading to access of wrong sg entries (or out-of-bounds if the list is not an array).

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8f7f7a6d5aed8f346a1c936fba02033c73a337dc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db368164383c46f256ed8152a41ae9300e615028

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/loongson2-mmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8f7f7a6d5aed8f346a1c936fba02033c73a337dc",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            },
            {
              "lessThan": "db368164383c46f256ed8152a41ae9300e615028",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            },
            {
              "lessThan": "00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/loongson2-mmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: loongson2: Fix sg iteration in data reorder functions\n\nIn ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(),\nthe for_each_sg() macro already iterates over the scatterlist entries,\nwith \u0027sg\u0027 pointing to the current entry. However, the code incorrectly\nuses \u0027\u0026sg[i]\u0027 and \u0027sg_dma_len(\u0026sg[i])\u0027 inside the loop, which treats\n\u0027sg\u0027 as an array base and indexes it again, leading to access of\nwrong sg entries (or out-of-bounds if the list is not an array)."
    }
  ],
  "id": "CVE-2026-80748",
  "lastModified": "2026-09-04T05:17:14.773",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-03T13:06:14.410",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8f7f7a6d5aed8f346a1c936fba02033c73a337dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db368164383c46f256ed8152a41ae9300e615028"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-80748 (GCVE-0-2026-80748)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:26 – Updated: 2026-09-04 04:58

Title

mmc: loongson2: Fix sg iteration in data reorder functions

Summary

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 CNA under the mitre root

CNA scorecard D 53/100 over 6637 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/8f7f7a6d5aed8f346…
https://git.kernel.org/stable/c/db368164383c46f25…
https://git.kernel.org/stable/c/00179ed9fbe077996…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2115772014bdac368317e997ed15016cf2792665 , < 8f7f7a6d5aed8f346a1c936fba02033c73a337dc (git) Affected: 2115772014bdac368317e997ed15016cf2792665 , < db368164383c46f256ed8152a41ae9300e615028 (git) Affected: 2115772014bdac368317e997ed15016cf2792665 , < 00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.46 , ≤ 6.18.* (semver) Unaffected: 7.1.10 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/loongson2-mmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8f7f7a6d5aed8f346a1c936fba02033c73a337dc",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            },
            {
              "lessThan": "db368164383c46f256ed8152a41ae9300e615028",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            },
            {
              "lessThan": "00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c",
              "status": "affected",
              "version": "2115772014bdac368317e997ed15016cf2792665",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/loongson2-mmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "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": "6.18.46",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.10",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: loongson2: Fix sg iteration in data reorder functions\n\nIn ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(),\nthe for_each_sg() macro already iterates over the scatterlist entries,\nwith \u0027sg\u0027 pointing to the current entry. However, the code incorrectly\nuses \u0027\u0026sg[i]\u0027 and \u0027sg_dma_len(\u0026sg[i])\u0027 inside the loop, which treats\n\u0027sg\u0027 as an array base and indexes it again, leading to access of\nwrong sg entries (or out-of-bounds if the list is not an array)."
        }
      ],
      "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 flaw is in the Loongson-2K MMC host driver reached via local block I/O and MMC ioctls (SD writes trigger SD_APP_SEND_NUM_WR_BLKS; card init issues SD_SWITCH/SCR), not via any network protocol; it affects LoongArch desktops, kiosks, and embedded systems with SD/eMMC slots.\nAC:L - An attacker with SD-backed storage access can reliably drive the post-DMA reorder path on every qualifying transfer; the double-indexed for_each_sg bug deterministically accesses wrong scatterlist entries whenever sg_len exceeds one, without races or uncontrollable memory layout.\nPR:L - Any unprivileged local user writing to an SD-backed filesystem or opening the mmc block device can trigger the vulnerable reorder functions; no CAP_SYS_ADMIN, init-namespace root, or user-namespace capability is required.\nUI:N - Exploitation requires only the attacker\u0027s own writes, MMC_IOC_CMD ioctl sequences, or kernel auto-enumeration after SD insertion; no separate victim mount, login, or cooperative action is needed.\nS:U - Scatterlist mis-indexing corrupts kernel heap memory within the host kernel security boundary; this is standard local privilege-escalation impact, not VM escape, IOMMU bypass, or cross-container authority change.\nC:H - sg_virt(\u0026sg[i]) on a mis-advanced pointer reads from wrong or out-of-bounds scatterlist entries, exposing adjacent kernel memory; out-of-bounds reads are rated High and can leak pointers usable for further exploitation.\nI:H - The reorder loop writes bitrev8x4/cpu_to_be32-transformed values through the mis-indexed scatterlist pointer, performing out-of-bounds kernel memory writes that can corrupt adjacent objects and enable arbitrary code execution.\nA:H - Corrupting adjacent kernel structures via the out-of-bounds scatterlist write can cause immediate kernel oops or panic; memory corruption bugs in interrupt context are rated High availability impact even when not fully weaponized."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T04:58:28.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8f7f7a6d5aed8f346a1c936fba02033c73a337dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/db368164383c46f256ed8152a41ae9300e615028"
        },
        {
          "url": "https://git.kernel.org/stable/c/00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c"
        }
      ],
      "title": "mmc: loongson2: Fix sg iteration in data reorder functions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80748",
    "datePublished": "2026-09-03T08:26:29.532Z",
    "dateReserved": "2026-08-26T14:34:25.790Z",
    "dateUpdated": "2026-09-04T04:58:28.127Z",
    "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.

Vulnerability timeline

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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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