CVE-2024-35813 (GCVE-0-2024-35813)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2026-08-05 11:30
VLAI
Title
mmc: core: Avoid negative index with array access
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid negative index with array access Commit 4d0c8d0aef63 ("mmc: core: Use mrq.sbc in close-ended ffu") assigns prev_idata = idatas[i - 1], but doesn't check that the iterator i is greater than zero. Let's fix this by adding a check.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:39 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f49f9e802785291149bdc9c824414de4604226b4 , < b9a7339ae403035ffe7fc37cb034b36947910f68 (git)
Affected: 59020bf0999ff7da8aedcd00ef8f0d75d93b6d20 , < 2b539c88940e22494da80a93ee1c5a28bbad10f6 (git)
Affected: 50b8b7a22e90bab9f1949b64a88ff17ab10913ec , < 81b8645feca08a54c7c4bf36e7b176f4983b2f28 (git)
Affected: c4edcd134bb72b3b0acc884612d624e48c9d057f , < ad9cc5e9e53ab94aa0c7ac65d43be7eb208dcb55 (git)
Affected: 1653a8102868264f3488c298a9f20af2add9a288 , < 4466677dcabe2d70de6aa3d4bd4a4fafa94a71f2 (git)
Affected: eed9119f8f8e8fbf225c08abdbb58597fba807e0 , < 064db53f9023a2d5877a2d12de6bc27995f6ca56 (git)
Affected: 4d0c8d0aef6355660b6775d57ccd5d4ea2e15802 , < 7d0e8a6147550aa058fa6ade8583ad252aa61304 (git)
Affected: 4d0c8d0aef6355660b6775d57ccd5d4ea2e15802 , < cf55a7acd1ed38afe43bba1c8a0935b51d1dc014 (git)
Affected: 5.4.269 , < 5.4.274 (semver)
Affected: 5.10.210 , < 5.10.215 (semver)
Affected: 5.15.149 , < 5.15.154 (semver)
Affected: 6.1.76 , < 6.1.84 (semver)
Affected: 6.6.15 , < 6.6.24 (semver)
Affected: 6.7.3 , < 6.7.12 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.274",
                      "versionStartIncluding": "5.4.269",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.215",
                      "versionStartIncluding": "5.10.210",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.154",
                      "versionStartIncluding": "5.15.149",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.84",
                      "versionStartIncluding": "6.1.76",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.24",
                      "versionStartIncluding": "6.6.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7.12",
                      "versionStartIncluding": "6.7.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8.3",
                      "versionStartIncluding": "6.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9",
                      "versionStartIncluding": "6.8",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Avoid negative index with array access\n\nCommit 4d0c8d0aef63 (\"mmc: core: Use mrq.sbc in close-ended ffu\") assigns\nprev_idata = idatas[i - 1], but doesn\u0027t check that the iterator i is\ngreater than zero. Let\u0027s fix this by adding a check."
            }
          ],
          "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 bug is reached only via the MMC_IOC_CMD / MMC_IOC_MULTI_CMD ioctls on the local /dev/mmcblkN block device or the /dev/mmcblkNrpmb character device. There is no remote or adjacent-network path into drivers/mmc/core/block.c.\nAC:L - Triggering requires the uninitialized `flags` field (kmalloc\u0027d throughout the affected range) to have MMC_BLK_IOC_SBC set on the first command, which the attacker controls by grooming the kmalloc-96/128 slab before the ioctl, and which can be retried in a tight loop at no cost. The subsequent `idatas[-1]` neighbor (an adjacent kmalloc-8 object or a live stack slot) is likewise attacker-influenceable via standard heap/stack spraying.\nPR:L - The RPMB character-device entry point (mmc_rpmb_ioctl \u2192 mmc_blk_ioctl_cmd/mmc_blk_ioctl_multi_cmd) performs no capable() check whatsoever \u2014 only DAC permissions on /dev/mmcblkNrpmb gate it \u2014 and on Android and embedded platforms that node is routinely opened by non-root system daemons, so an unprivileged-but-authorized local process suffices.\nUI:N - The attacker issues the ioctl directly from their own process; no victim action, mount, or file open by another user is needed.\nS:U - The out-of-bounds access and the resulting corruption are entirely within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The negative index performs an out-of-bounds read of a pointer, and the resulting `prev_idata-\u003eic.arg` dereference reads attacker-chosen kernel memory that is then emitted as the CMD23 argument; more broadly the memory corruption is leverageable for kernel information disclosure.\nI:H - `memcpy(\u0026prev_idata-\u003eic.response, sbc.resp, sizeof(sbc.resp))` performs a 16-byte write through the out-of-bounds-derived pointer, giving a write primitive at a heap-groomable address (or over live kernel pointers on the stack) that is exploitable for privilege escalation.\nA:H - Dereferencing the wild `idatas[-1]` pointer \u2014 read at `prev_idata-\u003eic.arg` and write at `prev_idata-\u003eic.response` \u2014 reliably produces a kernel oops/panic in the common case where the neighboring memory is not a valid object."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:30:06.940Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b9a7339ae403035ffe7fc37cb034b36947910f68"
            },
            {
              "url": "https://git.kernel.org/stable/c/2b539c88940e22494da80a93ee1c5a28bbad10f6"
            },
            {
              "url": "https://git.kernel.org/stable/c/81b8645feca08a54c7c4bf36e7b176f4983b2f28"
            },
            {
              "url": "https://git.kernel.org/stable/c/ad9cc5e9e53ab94aa0c7ac65d43be7eb208dcb55"
            },
            {
              "url": "https://git.kernel.org/stable/c/4466677dcabe2d70de6aa3d4bd4a4fafa94a71f2"
            },
            {
              "url": "https://git.kernel.org/stable/c/064db53f9023a2d5877a2d12de6bc27995f6ca56"
            },
            {
              "url": "https://git.kernel.org/stable/c/7d0e8a6147550aa058fa6ade8583ad252aa61304"
            },
            {
              "url": "https://git.kernel.org/stable/c/cf55a7acd1ed38afe43bba1c8a0935b51d1dc014"
            }
          ],
          "title": "mmc: core: Avoid negative index with array access",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35813",
        "datePublished": "2024-05-17T13:23:18.902Z",
        "dateReserved": "2024-05-17T12:19:12.343Z",
        "dateUpdated": "2026-08-05T11:30:06.940Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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