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CVE-2024-35924 (GCVE-0-2024-35924)

Vulnerability from cvelistv5 – Published: 2024-05-19 10:10 – Updated: 2026-08-05 11:31
VLAI
Title
usb: typec: ucsi: Limit read size on v1.2
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Limit read size on v1.2 Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was increased from 16 to 256. In order to avoid overflowing reads for older systems, add a mechanism to use the read UCSI version to truncate read sizes on UCSI v1.2.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-20 15:11 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 266f403ec47573046dee4bcebda82777ce702c40 (git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 0defcaa09d3b21e8387829ee3a652c43fa91e13f (git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < b3db266fb031fba88c423d4bb8983a73a3db6527 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 6.6.27 , ≤ 6.6.* (semver)
Unaffected: 6.8.6 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "initial_release_date": "2024-05-19T00:00:00+00:00",
      "product_status:fixed": "709",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "22",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: typec: ucsi: Limit read size on v1.2",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35924.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-19T02:33:12Z",
      "cve": "CVE-2024-35924",
      "id": "CVE-2024-35924",
      "initial_release_date": "2024-05-21T01:59:10Z",
      "product_status:known_affected": "315",
      "product_status:known_not_affected": "171",
      "product_status:recommended": "690",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-35924",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35924.json",
      "version": "109"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-02T03:21:48.935Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/266f403ec47573046dee4bcebda82777ce702c40"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/0defcaa09d3b21e8387829ee3a652c43fa91e13f"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/b3db266fb031fba88c423d4bb8983a73a3db6527"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-35924",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-05-20T15:11:13.299971Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-05-23T19:01:24.910Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/usb/typec/ucsi/ucsi.c",
                "drivers/usb/typec/ucsi/ucsi.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "266f403ec47573046dee4bcebda82777ce702c40",
                  "status": "affected",
                  "version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
                  "versionType": "git"
                },
                {
                  "lessThan": "0defcaa09d3b21e8387829ee3a652c43fa91e13f",
                  "status": "affected",
                  "version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
                  "versionType": "git"
                },
                {
                  "lessThan": "b3db266fb031fba88c423d4bb8983a73a3db6527",
                  "status": "affected",
                  "version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/usb/typec/ucsi/ucsi.c",
                "drivers/usb/typec/ucsi/ucsi.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.5"
                },
                {
                  "lessThan": "5.5",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.27",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.8.*",
                  "status": "unaffected",
                  "version": "6.8.6",
                  "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": "6.6.27",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8.6",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: Limit read size on v1.2\n\nBetween UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was\nincreased from 16 to 256. In order to avoid overflowing reads for older\nsystems, add a mechanism to use the read UCSI version to truncate read\nsizes on UCSI v1.2."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The UCSI core is a local platform driver (ACPI OpRegion, I2C, or pmic_glink transport) with no network or adjacent-network exposure; the over-read is driven by local UCSI transactions and the leaked bytes are harvested locally through /sys/class/typec and /sys/class/power_supply attributes or the UCSI debugfs response file.\nAC:L - There is no race and no dependence on memory layout the attacker cannot influence \u2014 any UCSI command requesting more than 16 bytes on a PPM reporting version \u22641.2 deterministically reads past the MESSAGE_IN window, and UCSI 1.x PPMs were the common case on shipping hardware.\nPR:L - The typec class attributes populated from the over-read buffers (usb_power_delivery_revision, number_of_alternate_modes, power_operation_mode, supported_accessory_modes) and the ucsi power-supply properties derived from src_pdos are all DEVICE_ATTR_RO/0444, so an ordinary unprivileged local user can read the disclosed bytes; no capability or root is required to observe the leak.\nUI:N - The oversized MESSAGE_IN reads are issued by the driver itself during registration, resume, and connector-change work handling; no victim action is needed for the out-of-bounds access to occur or for its results to be exposed.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory (memremap\u0027d OpRegion, or the slab objects backing struct pmic_glink_ucsi / struct ucsi_ccg) and is consumed by the same kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 240 bytes beyond the 16-byte MESSAGE_IN window can be copied out \u2014 past read_buf[48] inside struct pmic_glink_ucsi, past the trailing op_data member of struct ucsi_ccg, or past the ACPI OpRegion \u2014 which is far more than a strictly bounded few-byte read and can expose adjacent heap contents (including pointers) through world-readable sysfs.\nI:N - The defect is purely an over-long read; every destination buffer is sized to the requested length, so no out-of-bounds write, allocation-size confusion, or control-flow corruption primitive is created.\nA:H - Reading hundreds of bytes past the end of a memremap\u0027d ACPI/MMIO OpRegion can fault on platforms where the mapping does not extend that far, and the slab over-reads in the ccg and glink backends trip KASAN, so the bug can take the machine down."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:31:01.698Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/266f403ec47573046dee4bcebda82777ce702c40"
            },
            {
              "url": "https://git.kernel.org/stable/c/0defcaa09d3b21e8387829ee3a652c43fa91e13f"
            },
            {
              "url": "https://git.kernel.org/stable/c/b3db266fb031fba88c423d4bb8983a73a3db6527"
            }
          ],
          "title": "usb: typec: ucsi: Limit read size on v1.2",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35924",
        "datePublished": "2024-05-19T10:10:35.044Z",
        "dateReserved": "2024-05-17T13:50:33.125Z",
        "dateUpdated": "2026-08-05T11:31:01.698Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.