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)
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linux linux_kernel Affected: 1da177e4c3f4 , < fcdbc1d7a4b6 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 0 , ≤ 6.9 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/fcdbc1d7a4b638e5d5668de461f320386f3002aa\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:21:49.046Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.4, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35948\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-01-16T21:10:33.097520Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"fcdbc1d7a4b6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.9\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T15:33:28.105Z\"}}], \"cna\": {\"title\": \"bcachefs: Check for journal entries overruning end of sb clean section\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a\", \"lessThan\": \"fcdbc1d7a4b638e5d5668de461f320386f3002aa\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/bcachefs/sb-clean.c\", \"fs/bcachefs/sb-errors_types.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/bcachefs/sb-clean.c\", \"fs/bcachefs/sb-errors_types.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/fcdbc1d7a4b638e5d5668de461f320386f3002aa\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:31:07.533Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35948\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:31:07.533Z\", \"dateReserved\": \"2024-05-17T13:50:33.134Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-20T09:17:34.536Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.