160 lines
7.2 KiB
JSON
160 lines
7.2 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-2026-27456",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-02-19T17:25:31.100Z",
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"datePublished": "2026-04-03T21:23:00.984Z",
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"dateUpdated": "2026-04-06T15:42:35.774Z"
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},
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"containers": {
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"cna": {
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"title": "util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-59",
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"lang": "en",
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"description": "CWE-59: Improper Link Resolution Before File Access ('Link Following')",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-269",
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"lang": "en",
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"description": "CWE-269: Improper Privilege Management",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-367",
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"lang": "en",
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"description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
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"type": "CWE"
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}
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]
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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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"attackComplexity": "HIGH",
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"attackVector": "LOCAL",
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"availabilityImpact": "NONE",
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"baseScore": 4.7,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "NONE",
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"privilegesRequired": "LOW",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g"
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},
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{
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"name": "https://github.com/util-linux/util-linux/commit/5e390467b26a3cf3fecc04e1a0d482dff3162fc4",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/util-linux/util-linux/commit/5e390467b26a3cf3fecc04e1a0d482dff3162fc4"
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},
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{
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"name": "https://github.com/util-linux/util-linux/releases/tag/v2.41.4",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.4"
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}
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],
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"affected": [
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{
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"vendor": "util-linux",
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"product": "util-linux",
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"versions": [
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{
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"version": "< 2.41.4",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-04-03T21:23:00.984Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4."
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}
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],
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"source": {
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"advisory": "GHSA-qq4x-vfq4-9h9g",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g",
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"tags": [
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"exploit"
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]
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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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"timestamp": "2026-04-06T15:38:42.794607Z",
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"id": "CVE-2026-27456",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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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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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-04-06T15:42:35.774Z"
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}
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}
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]
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}
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} |