310 lines
15 KiB
JSON
310 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46078",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.096Z",
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"datePublished": "2026-05-27T12:58:11.916Z",
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"dateUpdated": "2026-10-19T19:26:43.106Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:29:31.009Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/erofs/dir.c"
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],
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"versions": [
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{
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"version": "3aa8ec716e52c02360457fa018296629b4d0becf",
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"status": "affected",
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},
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"version": "3aa8ec716e52c02360457fa018296629b4d0becf",
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"lessThan": "aa16dca1b062355181ef215229eeac249d7c0d61",
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"status": "affected",
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},
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"status": "affected",
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"status": "affected",
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"lessThan": "48b27a955d22391c7f30169fa7b6b2e1977f1ce4",
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"status": "affected",
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"status": "affected",
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"versionType": "git"
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{
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"version": "3aa8ec716e52c02360457fa018296629b4d0becf",
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"lessThan": "1d55445226c75ddd4e78b09b3e7d99109b28c366",
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"status": "affected",
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},
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{
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"version": "3aa8ec716e52c02360457fa018296629b4d0becf",
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"lessThan": "d18a3b5d337fa412a38e776e6b4b857a58836575",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/erofs/dir.c"
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],
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"versions": [
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{
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"version": "4.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.175",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.140",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.86",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.27",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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"url": "https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214"
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"url": "https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366"
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"url": "https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575"
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}
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],
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"title": "erofs: fix the out-of-bounds nameoff handling for trailing dirents",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-46078",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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"Technical Impact": "partial"
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:19:29.931334Z"
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-10-19T19:26:43.106Z"
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} |