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CVE-2024-35948 (GCVE-0-2024-35948)

Vulnerability from cvelistv5 – Published: 2024-05-20 09:17 – Updated: 2026-08-05 11:31
VLAI
Title
bcachefs: Check for journal entries overruning end of sb clean section
Summary
In the Linux kernel, the following vulnerability has been resolved: bcachefs: Check for journal entries overruning end of sb clean section Fix a missing bounds check in superblock validation. Note that we don't yet have repair code for this case - repair code for individual items is generally low priority, since the whole superblock is checksummed, validated prior to write, and we have backups.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-16 21:10 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a , < fcdbc1d7a4b638e5d5668de461f320386f3002aa (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4 , < fcdbc1d7a4b6 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 0 , ≤ 6.9 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35948.json",
      "version": "20"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-02T03:21:49.046Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/fcdbc1d7a4b638e5d5668de461f320386f3002aa"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "affected": [
              {
                "cpes": [
                  "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "linux_kernel",
                "vendor": "linux",
                "versions": [
                  {
                    "lessThan": "fcdbc1d7a4b6",
                    "status": "affected",
                    "version": "1da177e4c3f4",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "cpes": [
                  "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "linux_kernel",
                "vendor": "linux",
                "versions": [
                  {
                    "lessThanOrEqual": "6.9",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 8.4,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-35948",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-01-16T21:10:33.097520Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-400",
                    "description": "CWE-400 Uncontrolled Resource Consumption",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-06-17T15:33:28.105Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/bcachefs/sb-clean.c",
                "fs/bcachefs/sb-errors_types.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "fcdbc1d7a4b638e5d5668de461f320386f3002aa",
                  "status": "affected",
                  "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/bcachefs/sb-clean.c",
                "fs/bcachefs/sb-errors_types.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": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9",
                      "versionStartIncluding": "6.7",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: Check for journal entries overruning end of sb clean section\n\nFix a missing bounds check in superblock validation.\n\nNote that we don\u0027t yet have repair code for this case - repair code for\nindividual items is generally low priority, since the whole superblock\nis checksummed, validated prior to write, and we have backups."
            }
          ],
          "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 code is reached only by mounting a bcachefs image (crafted USB stick, loop-mounted file, or removable media auto-mounted by udisks2), which requires local access to the machine. There is no network-facing path to the superblock clean-section parser.\nAC:L - The attacker fully controls every byte of the superblock, including the `jset_entry` u64s length field and the superblock checksum, so the overrun triggers deterministically on the first mount with no race or memory-layout precondition.\nPR:L - In the standard desktop/kiosk deployment an unprivileged local user need only attach the crafted volume and a root-owned auto-mounter parses it on their behalf, so no privileges beyond an ordinary local account are required to deliver the malicious superblock.\nUI:N - Under removable-media auto-mount the attacker inserts the device themselves and recovery runs without any separate victim action; no other user must open a file or perform any step.\nS:U - The out-of-bounds accesses corrupt and disclose kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unbounded walk reads up to ~512 KB past the kmemdup\u0027d clean-section buffer, and the fsck error paths render those out-of-bounds heap bytes into the kernel log via `bch2_bkey_val_to_text()`, giving a direct heap-memory disclosure primitive.\nI:H - `journal_entry_null_range()` memsets and `journal_validate_key()` memmoves over memory past the end of the allocation, and the null-range loop advances by out-of-bounds `u64s` values with an `!=` terminator so it can overshoot and zero arbitrary adjacent heap objects \u2014 heap corruption exploitable for control-flow influence.\nA:H - The out-of-bounds read/write walk of up to hundreds of kilobytes past a small slab object reliably faults, trips KASAN/BUG, or corrupts unrelated kernel structures, panicking the machine on mount."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:31:07.533Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fcdbc1d7a4b638e5d5668de461f320386f3002aa"
            }
          ],
          "title": "bcachefs: Check for journal entries overruning end of sb clean section",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35948",
        "datePublished": "2024-05-20T09:17:34.536Z",
        "dateReserved": "2024-05-17T13:50:33.134Z",
        "dateUpdated": "2026-08-05T11:31:07.533Z",
        "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

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.


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.