{"id":"USN-8621-1","summary":"samba vulnerabilities","details":"It was discovered that Samba's pam_winbind incorrectly handled home\ndirectory ownership when mkhomedir was enabled. A local attacker could\npossibly use this issue to cause a denial of service by triggering a change\nin ownership of the root directory. (CVE-2026-15779)\n\nArjun Basnet, Douglas Bagnall, and Andrew Tridgell discovered that Samba\nincorrectly handled TSIG packets with name compression. A remote attacker\ncould possibly use this issue to cause Samba to crash, resulting in a\ndenial of service. (CVE-2026-6949)\n\nTristan Madani discovered that Samba incorrectly handled malformed ASN.1\nkpasswd packets. An authenticated user could possibly use this issue to\ncause Samba to crash, resulting in a denial of service. (CVE-2026-58216)\n\nAndrew Tridgell and Tristan Madani discovered that Samba incorrectly\nhandled TKEY name registration. A remote attacker could possibly use this\nissue to exhaust the TKEY name cache, resulting in a denial of service.\n(CVE-2026-58218)\n\nIt was discovered that Samba incorrectly handled internal LDB special\ndirectory names when processing authenticated LDAP requests. An\nauthenticated user could possibly use this issue to perform unauthorized\nmodifications and gain control of a domain. (CVE-2026-58221)\n\nAndrew Tridgell and Tristan Madani discovered that Samba incorrectly\nhandled LDAP Compare requests. An authenticated user could possibly use\nthis issue to obtain sensitive information. (CVE-2026-58222)\n\nTristan Madani, Andrew Tridgell, and Martin Schwenke discovered that the\nCTDB protocol in Samba had insufficient bounds checking. A remote attacker\ncould possibly use this issue to cause Samba to crash, resulting in a\ndenial of service. (CVE-2026-58224)","modified":"2026-08-17T12:31:32.544955314Z","published":"2026-07-28T11:50:00Z","related":["UBUNTU-CVE-2026-15779","UBUNTU-CVE-2026-58216","UBUNTU-CVE-2026-58218","UBUNTU-CVE-2026-58221","UBUNTU-CVE-2026-58222","UBUNTU-CVE-2026-58224","UBUNTU-CVE-2026-6949"],"upstream":["UBUNTU-CVE-2026-6949","UBUNTU-CVE-2026-15779","UBUNTU-CVE-2026-58216","UBUNTU-CVE-2026-58218","UBUNTU-CVE-2026-58221","UBUNTU-CVE-2026-58222","UBUNTU-CVE-2026-58224"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8621-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6949"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-15779"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58216"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58218"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58221"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58222"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58224"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/samba?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.15.13+dfsg-0ubuntu1.13"}]}],"versions":["2:4.13.5+dfsg-2ubuntu2","2:4.13.5+dfsg-2ubuntu3","2:4.13.14+dfsg-0ubuntu1","2:4.13.14+dfsg-0ubuntu2","2:4.15.5~dfsg-0ubuntu1","2:4.15.5~dfsg-0ubuntu2","2:4.15.5~dfsg-0ubuntu4","2:4.15.5~dfsg-0ubuntu5","2:4.15.5~dfsg-0ubuntu5.1","2:4.15.9+dfsg-0ubuntu0.2","2:4.15.9+dfsg-0ubuntu0.3","2:4.15.13+dfsg-0ubuntu1","2:4.15.13+dfsg-0ubuntu1.1","2:4.15.13+dfsg-0ubuntu1.2","2:4.15.13+dfsg-0ubuntu1.3","2:4.15.13+dfsg-0ubuntu1.4","2:4.15.13+dfsg-0ubuntu1.5","2:4.15.13+dfsg-0ubuntu1.6","2:4.15.13+dfsg-0ubuntu1.7","2:4.15.13+dfsg-0ubuntu1.8","2:4.15.13+dfsg-0ubuntu1.9","2:4.15.13+dfsg-0ubuntu1.10","2:4.15.13+dfsg-0ubuntu1.12"],"ecosystem_specific":{"binaries":[{"binary_name":"ctdb","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_name":"libnss-winbind","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"libpam-winbind"},{"binary_name":"libsmbclient","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"libwbclient0"},{"binary_name":"python3-samba","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"registry-tools"},{"binary_name":"samba","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"samba-common"},{"binary_name":"samba-common-bin","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"samba-dsdb-modules"},{"binary_name":"samba-libs","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"samba-testsuite"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"samba-vfs-modules"},{"binary_name":"smbclient","binary_version":"2:4.15.13+dfsg-0ubuntu1.13"},{"binary_version":"2:4.15.13+dfsg-0ubuntu1.13","binary_name":"winbind"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2026-6949","severity":[{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-15779","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-58216"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-58218"},{"severity":[{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-58221"},{"id":"CVE-2026-58222","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-58224","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8621-1.json"}},{"package":{"name":"samba","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/samba?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.19.5+dfsg-4ubuntu9.7"}]}],"versions":["2:4.18.6+dfsg-1ubuntu2","2:4.18.6+dfsg-1ubuntu2.1","2:4.18.6+dfsg-1ubuntu2.2","2:4.19.4+dfsg-3ubuntu1","2:4.19.5+dfsg-1ubuntu1","2:4.19.5+dfsg-4ubuntu7","2:4.19.5+dfsg-4ubuntu8","2:4.19.5+dfsg-4ubuntu9","2:4.19.5+dfsg-4ubuntu9.2","2:4.19.5+dfsg-4ubuntu9.3","2:4.19.5+dfsg-4ubuntu9.4","2:4.19.5+dfsg-4ubuntu9.6"],"ecosystem_specific":{"availability":"No 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