{"affected":[{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"samba-winbind","product":"Red Hat Enterprise Linux 10","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"unknown","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"samba-winbind","product":"Red Hat Enterprise Linux 6","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"samba-winbind","product":"Red Hat Enterprise Linux 7","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"samba-winbind","product":"Red Hat Enterprise Linux 8","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"samba-winbind","product":"Red Hat Enterprise Linux 9","source":"CNA: redhat","vendor":"Red Hat","versions":[]}],"cveId":"CVE-2026-15779","cwes":["CWE-732"],"description":"A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.","epss":{"date":"2026-11-05","percentile":0.04065,"score":0.00148},"exploits":[],"kev":null,"metrics":[{"score":6.1,"severity":"medium","source":"CNA: redhat","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},{"score":6.1,"severity":"medium","source":"NVD: secalert@redhat.com","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.1"}],"modifiedAt":1793899090397,"publishedAt":1784118784688,"references":[{"source":"CNA: redhat","tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-15779"},{"source":"CNA: redhat","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2499991"},{"source":"CNA: redhat","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.19.4/nsswitch/pam_winbind.c"},{"source":"CNA: redhat","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.23.5/nsswitch/pam_winbind.c#L1622"},{"source":"CNA: redhat","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.24.3/nsswitch/pam_winbind.c#L1590"},{"source":"secalert@redhat.com","tags":[],"url":"https://access.redhat.com/security/cve/CVE-2026-15779"},{"source":"secalert@redhat.com","tags":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2499991"},{"source":"secalert@redhat.com","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.19.4/nsswitch/pam_winbind.c"},{"source":"secalert@redhat.com","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.23.5/nsswitch/pam_winbind.c#L1622"},{"source":"secalert@redhat.com","tags":[],"url":"https://gitlab.com/samba-team/samba/-/blob/samba-4.24.3/nsswitch/pam_winbind.c#L1590"}],"remediation":[{"kind":"workaround","source":"CNA: redhat","text":"Do not enable mkhomedir in pam_winbind.conf on systems where any account (including system accounts) may resolve to a home directory of / or another sensitive system path."}],"revision":"0843d976829a5ad3f07294504ceff7656d965c5bc6877a377c900ba25ae591f5","sources":[{"modifiedAt":1793896974277,"name":"CNA: redhat","retrievedAt":1793898805813,"url":"https://www.cve.org/CVERecord?id=CVE-2026-15779"},{"modifiedAt":1793899090397,"name":"NVD","retrievedAt":1793902836375,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15779"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793898812462,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-15779"}],"ssvc":{"assessedAt":1784120666614,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validation","updatedAt":1793902836375}