{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46078", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.096Z", "datePublished": "2026-05-27T12:58:11.916Z", "dateUpdated": "2026-08-05T12:29:31.009Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:31.009Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix the out-of-bounds nameoff handling for trailing dirents\n\nCurrently we already have boundary-checks for nameoffs, but the trailing\ndirents are special since the namelens are calculated with strnlen()\nwith unchecked nameoffs.\n\nIf a crafted EROFS has a trailing dirent with nameoff >= maxsize,\nmaxsize - nameoff can underflow, causing strnlen() to read past the\ndirectory block.\n\nnameoff0 should also be verified to be a multiple of\n`sizeof(struct erofs_dirent)` as well [1].\n\n[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is triggered by parsing a maliciously crafted EROFS filesystem image during a directory read; the data is processed locally after the image is presented (file/loop/removable media), with no network reachability for the readdir path.\nAC:L - An attacker fully controls the on-disk `nameoff` field of the trailing dirent in the crafted image, so the unsigned underflow and resulting out-of-bounds `strnlen` are reproduced deterministically every time the directory is read.\nPR:N - Once the crafted image is mounted, triggering the bug requires only an ordinary directory listing (getdents/readdir), which needs no special privileges; this matches the sibling crafted-image EROFS CVE-2026-43166.\nUI:R - EROFS lacks FS_USERNS_MOUNT and requires CAP_SYS_ADMIN to mount, so a separate user/automounter must mount the attacker-supplied image before the vulnerable readdir path can execute.\nS:U - The out-of-bounds access stays within the kernel's own memory and security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The underflowed length drives an unbounded `strnlen` that reads kernel memory far past the directory-block buffer; per the OOB-read guidance this unbounded read is High.\nI:N - The defect is strictly a read (strnlen over adjacent memory); no out-of-bounds write, use-after-free, or type confusion occurs, so no data can be modified.\nA:H - Scanning up to ~4 GB past the buffer readily walks into unmapped memory, producing a kernel oops/panic and denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/erofs/dir.c" ], "versions": [ { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "a8ee527807f7d97e55ce2ef2906f7f34975eb1c7", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "aa16dca1b062355181ef215229eeac249d7c0d61", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "80a23c6d1aba35be8746d74ac14e6ba5ae46da21", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "222055e6b4063abd2d9e13c3d49bbd1724c50789", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "48b27a955d22391c7f30169fa7b6b2e1977f1ce4", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "8ebb951a284b7446e025afc7dc5e9516ef9a7214", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "1d55445226c75ddd4e78b09b3e7d99109b28c366", "status": "affected", "versionType": "git" }, { "version": "3aa8ec716e52c02360457fa018296629b4d0becf", "lessThan": "d18a3b5d337fa412a38e776e6b4b857a58836575", "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/erofs/dir.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.19", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a8ee527807f7d97e55ce2ef2906f7f34975eb1c7" }, { "url": "https://git.kernel.org/stable/c/aa16dca1b062355181ef215229eeac249d7c0d61" }, { "url": "https://git.kernel.org/stable/c/80a23c6d1aba35be8746d74ac14e6ba5ae46da21" }, { "url": "https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789" }, { "url": "https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4" }, { "url": "https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214" }, { "url": "https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366" }, { "url": "https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575" } ], "title": "erofs: fix the out-of-bounds nameoff handling for trailing dirents", "x_generator": { "engine": "bippy-1.2.0" } } } }