{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46751", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.268Z", "datePublished": "2024-09-18T07:12:11.240Z", "dateUpdated": "2026-08-05T11:38:21.347Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:38:21.347Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info()\n\nInstead of doing a BUG_ON() handle the error by returning -EUCLEAN,\naborting the transaction and logging an error message." } ], "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 path is reached through a locally attached btrfs filesystem — a crafted image on a USB stick, loop-mounted file, or container/VM disk image — and then driven by ordinary local file writes or subvolume deletion. There is no network-facing consumer of btrfs_lookup_extent_info().\nAC:L - The triggering condition is a static, fully attacker-controlled on-disk value (extent item refs == 0) that the tree checker does not reject, so the crafted image deterministically hits the BUG_ON on the first COW or snapshot-delete of the affected block. No race, timing window, or memory-layout dependency is involved.\nPR:L - Once a crafted or inconsistent btrfs is mounted — routinely via desktop/kiosk automount (udisks2/systemd), shared storage, or container images — any unprivileged local user with write access drives btrfs_force_cow_block()/btrfs_drop_snapshot() into the assertion; no capability check gates the path.\nUI:N - After the filesystem is present, the attacker triggers the fault entirely through their own file writes or a subvolume delete, with no action required from any other user. Automount removes the need for a victim to explicitly mount the device.\nS:U - The crash and any resulting metadata corruption are confined to the kernel and the affected btrfs filesystem, within the same security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The assertion is btrfs's last line of defense before operating on an extent with broken reference bookkeeping; when it is bypassed (CONFIG_BUG=n embedded/IoT builds) update_ref_for_cow() takes the last-reference path and frees a still-referenced tree block, producing cross-linked extents that expose one file's or subvolume's data through another. The oops itself also dumps kernel registers, stack contents, and pointers to the log.\nI:H - Continuing past a zero refcount causes btrfs to free and re-allocate live metadata blocks, giving the attacker arbitrary corruption of extent-tree and file data belonging to other users on the filesystem. The oops additionally aborts a transaction mid-flight, leaving on-disk state inconsistent.\nA:H - BUG_ON() panics the kernel outright under panic_on_oops; otherwise the task is killed while still holding delayed_refs->lock, head->mutex, and tree locks, so every subsequent delayed-ref operation on that filesystem spins or blocks forever — an unrecoverable filesystem-wide hang and potential hard lockup, which is exactly why the fix unlocks all three before returning -EUCLEAN." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/extent-tree.c" ], "versions": [ { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "9c309d2434abbe880712af7e60da9ead8b6703fe", "status": "affected", "versionType": "git" }, { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "d64807ded1b6054f066e03d8add6d920f3db9e5d", "status": "affected", "versionType": "git" }, { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "18eb53a2734ff61b9a72c4fef5db7b38cb48ae16", "status": "affected", "versionType": "git" }, { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "3cfec712a439c5c5f5c718c5c669ee41a898f776", "status": "affected", "versionType": "git" }, { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "ef9a8b73c8b60b27d9db4787e624a3438ffe8428", "status": "affected", "versionType": "git" }, { "version": "5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0", "lessThan": "28cb13f29faf6290597b24b728dc3100c019356f", "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/btrfs/extent-tree.c" ], "versions": [ { "version": "2.6.31", "status": "affected" }, { "version": "0", "lessThan": "2.6.31", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.238", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.184", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.140", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.92", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.10", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "2.6.31", "versionEndExcluding": "5.10.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.15.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.1.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.6.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.10.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9c309d2434abbe880712af7e60da9ead8b6703fe" }, { "url": "https://git.kernel.org/stable/c/d64807ded1b6054f066e03d8add6d920f3db9e5d" }, { "url": "https://git.kernel.org/stable/c/18eb53a2734ff61b9a72c4fef5db7b38cb48ae16" }, { "url": "https://git.kernel.org/stable/c/3cfec712a439c5c5f5c718c5c669ee41a898f776" }, { "url": "https://git.kernel.org/stable/c/ef9a8b73c8b60b27d9db4787e624a3438ffe8428" }, { "url": "https://git.kernel.org/stable/c/28cb13f29faf6290597b24b728dc3100c019356f" } ], "title": "btrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T14:47:35.151913Z", "id": "CVE-2024-46751", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T14:47:50.614Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:31:02.648Z" } } ] } }