CVE-2026-88924

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This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root."}], "id": "CVE-2026-88924", "lastModified": "2026-11-11T19:17:46.477", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88924", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-10T17:32:34.743791Z", "version": "2.0.3"}}]}, "published": "2026-09-10T15:17:59.253", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:73998"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74370"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:85939"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:85941"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:85942"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:85944"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:98513"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:98623"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-88924"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531456"}, {"source": "secalert@redhat.com", "url": "https://gitlab.gnome.org/GNOME/gvfs/-/issues/875"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://gitlab.gnome.org/GNOME/gvfs/-/issues/875"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank lain for reporting this issue.", "bugzilla": {"description": "gvfs: gvfs-admin socket ownership race permits local root", "id": "2531456", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531456"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, adjust Polkit rules to require password authentication to start gvfsd-admin or remove execute permissions of the gvfsd-admin binary to prevent execution."}, "name": "CVE-2026-88924", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "gvfs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "gvfs", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "gvfs", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "gvfs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "gvfs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88924\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88924\nhttps://gitlab.gnome.org/GNOME/gvfs/-/issues/875"], "statement": "To exploit this issue, an attacker needs local access to the system and the ability to start the gvfsd-admin daemon. Furthermore, the attacker must successfully win a timing race condition, increasing the attack complexity. However, successful exploitation can allow the attacker to change the ownership of arbitrary system files, resulting in a full local privilege escalation to root. For these reasons, this vulnerability has been rated with a high severity.", "threat_severity": "Important"}

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