CVE-2026-88838

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88838", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-09-10T09:42:04.559Z", "datePublished": "2026-10-13T16:56:15.518Z", "dateUpdated": "2026-10-14T16:16:14.045Z"}, "containers": {"cna": {"title": "Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "busybox", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:hummingbird:1"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-88838", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531352", "name": "RHBZ#2531352", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-10-13T13:50:19.705Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-693", "description": "Protection Mechanism Failure", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-693: Protection Mechanism Failure", "workarounds": [{"lang": "en", "value": "Do not install BusyBox mount setuid root where user-mountable fstab entries use nosuid, nodev, or noexec. Remove user/users from sensitive fstab lines, or use util-linux mount."}], "timeline": [{"lang": "en", "time": "2026-09-09T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-13T13:50:19.705Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-13T16:56:15.518Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-14T16:09:48.357357Z", "id": "CVE-2026-88838", "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": "2026-10-14T16:16:14.045Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-88838", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-14T16:09:48.357357Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-14T16:12:32.438Z"}}], "cna": {"title": "Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions", "credits": [{"lang": "en", "value": "Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue."}], "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}], "affected": [{"cpes": ["cpe:/a:redhat:hummingbird:1"], "vendor": "Red Hat", "product": "Red Hat Hardened Images", "packageName": "busybox", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}], "timeline": [{"lang": "en", "time": "2026-09-09T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-13T13:50:19.705Z", "value": "Made public."}], "datePublic": "2026-10-13T13:50:19.705Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-88838", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531352", "name": "RHBZ#2531352", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "Do not install BusyBox mount setuid root where user-mountable fstab entries use nosuid, nodev, or noexec. Remove user/users from sensitive fstab lines, or use util-linux mount."}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-693", "description": "Protection Mechanism Failure"}]}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-13T16:56:15.518Z"}, "x_redhatCweChain": "CWE-693: Protection Mechanism Failure"}}, "cveMetadata": {"cveId": "CVE-2026-88838", "state": "PUBLISHED", "dateUpdated": "2026-10-14T16:16:14.045Z", "dateReserved": "2026-09-10T09:42:04.559Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2026-10-13T16:56:15.518Z", "assignerShortName": "redhat"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:hummingbird:1"], "defaultStatus": "affected", "packageName": "busybox", "product": "Red Hat Hardened Images", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce."}], "id": "CVE-2026-88838", "lastModified": "2026-10-15T16:33:26.290", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88838", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-14T16:09:48.357357Z", "version": "2.0.3"}}]}, "published": "2026-10-13T17:17:48.340", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-88838"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531352"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-693"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.", "bugzilla": {"description": "busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions", "id": "2531352", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531352"}, "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:H/A:N", "status": "draft"}, "cwe": "CWE-693", "details": ["A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce."], "mitigation": {"lang": "en:us", "value": "Do not install BusyBox mount setuid root where user-mountable fstab entries use nosuid, nodev, or noexec. Remove user/users from sensitive fstab lines, or use util-linux mount."}, "name": "CVE-2026-88838", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "busybox", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-13T13:50:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88838\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88838"], "statement": "Exploitation requires BusyBox mount installed setuid root, FEATURE_MOUNT_FSTAB/user-mountable fstab entries, and attacker-controlled filesystem content for follow-on abuse (for example setuid binaries on removable media). Fedora ships BusyBox without setuid mount by default. Red Hat Hardened Images and embedded-style deployments should be assessed per image configuration. util-linux mount uses separate non-root validation.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Red Hat Hardened Images", "source": "cna", "vendor": "Red Hat"}, "product": "busybox", "vendor": "busybox"}], "created": "2026-10-13T19:00:06.866672+00:00", "updated": "2026-10-16T19:15:02.036804+00:00", "vendors": ["busybox", "busybox$PRODUCT$busybox"]}