CVE-2024-46751

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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 \u2014 routinely via desktop/kiosk automount (udisks2/systemd), shared storage, or container images \u2014 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 \u2014 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", 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el error devolviendo -EUCLEAN, cancelando la transacci\u00f3n y registrando un mensaje de error."}], "id": "CVE-2024-46751", "lastModified": "2026-08-04T11:20:21.980", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-46751", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T14:47:35.151913Z", "version": "2.0.3"}}]}, "published": "2024-09-18T08:15:04.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/18eb53a2734ff61b9a72c4fef5db7b38cb48ae16"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28cb13f29faf6290597b24b728dc3100c019356f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3cfec712a439c5c5f5c718c5c669ee41a898f776"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": 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{"bugzilla": {"description": "kernel: btrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info()", "id": "2313099", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2313099"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info()\nInstead of doing a BUG_ON() handle the error by returning -EUCLEAN,\naborting the transaction and logging an error message."], "name": "CVE-2024-46751", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46751\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46751\nhttps://lore.kernel.org/linux-cve-announce/2024091838-CVE-2024-46751-17f5@gregkh/T"], "threat_severity": "Moderate"}

{}