{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46780", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.276Z", "datePublished": "2024-09-18T07:12:36.736Z", "dateUpdated": "2026-08-05T11:38:31.009Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:38:31.009Z" }, "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." } ], "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//, 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 — 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 — 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 — 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": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "157c0d94b4c40887329418c70ef4edd1a8d6b4ed", "status": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "b14e7260bb691d7f563f61da07d61e3c8b59a614", "status": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "19cfeba0e4b8eda51484fcf8cf7d150418e1d880", "status": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "8c6e43b3d5f109cf9c61bc188fcc8175404e924f", "status": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "962562d4c70c5cdeb4e955d63ff2017c4eca1aad", "status": "affected", "versionType": "git" }, { "version": "da7141fb78db915680616e15677539fc8140cf53", "lessThan": "683408258917541bdb294cd717c210a04381931e", "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/nilfs2/sysfs.c" ], "versions": [ { "version": "3.17", "status": "affected" }, { "version": "0", "lessThan": "3.17", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.322", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.284", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.226", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.167", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.110", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.51", "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": "3.17", "versionEndExcluding": "4.19.322" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "5.4.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "5.10.226" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "5.15.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.1.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.6.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.10.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b90beafac05931cbfcb6b1bd4f67c1923f47040e" }, { "url": "https://git.kernel.org/stable/c/ba97ba173f9625d5f34a986088979eae8b80d38e" }, { "url": "https://git.kernel.org/stable/c/157c0d94b4c40887329418c70ef4edd1a8d6b4ed" }, { "url": "https://git.kernel.org/stable/c/b14e7260bb691d7f563f61da07d61e3c8b59a614" }, { "url": "https://git.kernel.org/stable/c/19cfeba0e4b8eda51484fcf8cf7d150418e1d880" }, { "url": "https://git.kernel.org/stable/c/8c6e43b3d5f109cf9c61bc188fcc8175404e924f" }, { "url": "https://git.kernel.org/stable/c/962562d4c70c5cdeb4e955d63ff2017c4eca1aad" }, { "url": "https://git.kernel.org/stable/c/683408258917541bdb294cd717c210a04381931e" } ], "title": "nilfs2: protect references to superblock parameters exposed in sysfs", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T14:38:16.059134Z", "id": "CVE-2024-46780", "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": "2024-09-29T14:38:30.940Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" }, { "url": 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