CVE-2024-46780

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So, accessing them requires mutual exclusion using\nthe reader/writer semaphore \"nilfs->ns_sem\".\n\nSome sysfs attribute show methods read this superblock buffer without the\nnecessary mutual exclusion, which can cause problems with pointer\ndereferencing and memory access, so fix it."}], "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 by reading a sysfs attribute file under /sys/fs/nilfs2/<device>/, which requires local access to the system. There is no network-facing path into nilfs2's sysfs show methods.\nAC:L - The attacker fully controls the read side and can retry unboundedly by spamming reads of the world-readable attributes from many threads, while the mutating side (nilfs_swap_super_block via nilfs_prepare_super during segment construction) fires repeatedly on any active nilfs2 mount and can be forced with write+sync activity. Unbounded, cheap retry against a continuously recurring window makes this reliably winnable.\nPR:L - The affected attributes are created with NILFS_DEV_RO_ATTR, i.e. mode 0444, so any unprivileged local user can read them with no capability whatsoever. No CAP_SYS_ADMIN is needed on the reader side \u2014 only on the unrelated mount/resize side.\nUI:N - Once a nilfs2 volume is mounted (at boot, via fstab, or by an automounter such as udisks on a kiosk/desktop), the attacker triggers the bug entirely on their own by reading sysfs. No victim action is required at exploitation time.\nS:U - The race, the freed page-cache folio, and the resulting disclosure or crash are all within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - When ns_sbp[0] has been released or replaced (nilfs_fall_back_super_block after an -EIO superblock write, or nilfs_move_2nd_super during resize), the show methods perform a use-after-free read of a freed bdev page-cache folio and copy those bytes verbatim to userspace via sysfs_emit/scnprintf \u2014 up to 80 bytes per read from volume_name, repeatable in a loop, yielding a kernel memory disclosure primitive over reallocated page contents.\nI:H - This is a use-after-free on a page-cache folio whose reuse the attacker can groom via page-spray, and per kernel UAF scoring practice such object-lifetime bugs are treated as leverageable for control over freed-and-reallocated kernel memory rather than as read-only. The unsynchronized pointer also lets the reader observe torn state (nilfs_dev_revision_show reloads sbp[0] twice across a swap), so kernel object state is consumed inconsistently.\nA:H - Dereferencing a superblock pointer that has been abandoned during degradation to one side, or that points into a released buffer_head's page, causes a kernel oops/panic \u2014 the commit explicitly cites \"problems with pointer dereferencing and memory access.\" Any such crash is High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nilfs2/sysfs.c"], "versions": [{"version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "b90beafac05931cbfcb6b1bd4f67c1923f47040e", "status": "affected", "versionType": "git"}, {"version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "ba97ba173f9625d5f34a986088979eae8b80d38e", "status": 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"cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*", "matchCriteriaId": "B77A9280-37E6-49AD-B559-5B23A3B1DC3D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: protect references to superblock parameters exposed in sysfs\n\nThe superblock buffers of nilfs2 can not only be overwritten at runtime\nfor modifications/repairs, but they are also regularly swapped, replaced\nduring resizing, and even abandoned when degrading to one side due to\nbacking device issues. So, accessing them requires mutual exclusion using\nthe reader/writer semaphore \"nilfs->ns_sem\".\n\nSome sysfs attribute show methods read this superblock buffer without the\nnecessary mutual exclusion, which can cause problems with pointer\ndereferencing and memory access, so fix it."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: protege las referencias a los par\u00e1metros de superbloque expuestos en sysfs Los b\u00faferes de superbloque de nilfs2 no solo se pueden sobrescribir en tiempo de ejecuci\u00f3n para modificaciones/reparaciones, sino que tambi\u00e9n se intercambian regularmente, se reemplazan durante el cambio de tama\u00f1o e incluso se abandonan cuando se degradan a un lado debido a problemas con el dispositivo de respaldo. Por lo tanto, acceder a ellos requiere exclusi\u00f3n mutua utilizando el sem\u00e1foro de lectura/escritura \"nilfs-&gt;ns_sem\". Algunos m\u00e9todos de demostraci\u00f3n del atributo sysfs leen este b\u00fafer de superbloque sin la exclusi\u00f3n mutua necesaria, lo que puede causar problemas con la desreferenciaci\u00f3n de punteros y el acceso a la memoria, as\u00ed que arr\u00e9glelo."}], "id": "CVE-2024-46780", "lastModified": "2026-08-04T11:20:24.790", "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-2024-46780", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T14:38:16.059134Z", "version": "2.0.3"}}]}, "published": "2024-09-18T08:15:05.473", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/157c0d94b4c40887329418c70ef4edd1a8d6b4ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19cfeba0e4b8eda51484fcf8cf7d150418e1d880"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/683408258917541bdb294cd717c210a04381931e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c6e43b3d5f109cf9c61bc188fcc8175404e924f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/962562d4c70c5cdeb4e955d63ff2017c4eca1aad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b14e7260bb691d7f563f61da07d61e3c8b59a614"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b90beafac05931cbfcb6b1bd4f67c1923f47040e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba97ba173f9625d5f34a986088979eae8b80d38e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nilfs2: protect references to superblock parameters exposed in sysfs", "id": "2313128", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2313128"}, "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-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnilfs2: protect references to superblock parameters exposed in sysfs\nThe superblock buffers of nilfs2 can not only be overwritten at runtime\nfor modifications/repairs, but they are also regularly swapped, replaced\nduring resizing, and even abandoned when degrading to one side due to\nbacking device issues. So, accessing them requires mutual exclusion using\nthe reader/writer semaphore \"nilfs->ns_sem\".\nSome sysfs attribute show methods read this superblock buffer without the\nnecessary mutual exclusion, which can cause problems with pointer\ndereferencing and memory access, so fix it."], "name": "CVE-2024-46780", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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-2024-46780\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46780\nhttps://lore.kernel.org/linux-cve-announce/2024091849-CVE-2024-46780-9155@gregkh/T"], "threat_severity": "Moderate"}

{}