{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35948", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.134Z", "datePublished": "2024-05-20T09:17:34.536Z", "dateUpdated": "2026-08-05T11:31:07.533Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:07.533Z" }, "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't 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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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'd 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 — 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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/bcachefs/sb-clean.c", "fs/bcachefs/sb-errors_types.h" ], "versions": [ { "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "lessThan": "fcdbc1d7a4b638e5d5668de461f320386f3002aa", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/bcachefs/sb-clean.c", "fs/bcachefs/sb-errors_types.h" ], "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.9" } ] } ] } ], "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" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-400", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "1da177e4c3f4", "status": "affected", "lessThan": "fcdbc1d7a4b6", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "0", "status": "unaffected", "lessThanOrEqual": "6.9", "versionType": "custom" } ] } ], "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": { "timestamp": "2025-01-16T21:10:33.097520Z", "id": "CVE-2024-35948", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-01-16T21:11:09.162Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:49.046Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/fcdbc1d7a4b638e5d5668de461f320386f3002aa", "tags": [ "x_transferred" ] } ] } ] } }