{"id":"CVE-2026-88838","state":"PUBLISHED","title":"Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions","description":"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.","publishedAt":"2026-10-13T16:56:15.518Z","updatedAt":"2026-10-14T16:16:14.045Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","source":"redhat"},"assigner":"redhat","products":["Red Hat Red Hat Hardened Images"],"affected":[{"vendor":"Red Hat","product":"Red Hat Hardened Images","packageName":"busybox","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:hummingbird:1"]}],"references":["https://access.redhat.com/security/cve/CVE-2026-88838","https://bugzilla.redhat.com/show_bug.cgi?id=2531352"],"weaknesses":["CWE-693"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/88xxx/CVE-2026-88838.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-88838","state":"PUBLISHED","datePublished":"2026-10-13T16:56:15.518Z","dateUpdated":"2026-10-14T16:16:14.045Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2026-09-10T09:42:04.559Z"},"containers":{"cna":{"title":"Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions","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","packageName":"busybox","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","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"]}],"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"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-693","description":"Protection Mechanism Failure","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateUpdated":"2026-10-13T16:56:15.518Z"},"datePublic":"2026-10-13T13:50:19.705Z","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."}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-14T16:16:14.045Z"}}]}}}