A flaw was found in Samba’s WINS server component when running as an Active Directory Domain Controller. The WINS protocol handlers for certain request types did not properly validate incoming packets, allowing an unauthenticated remote attacker to trigger a NULL pointer dereference and crash the WINS service using specially crafted UDP packets.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade samba | Jun 9, 2026 | Jun 8, 2026 |
| Amazon Linux Ami 2 | — | Upgrade samba-pythonUpgrade ctdb-testsUpgrade samba-commonUpgrade samba-debuginfoUpgrade samba-testUpgrade samba-python-testUpgrade samba-client-libsUpgrade ctdbUpgrade samba-krb5-printingUpgrade samba-pidlUpgrade libwbclientUpgrade samba-vfs-glusterfsUpgrade samba-develUpgrade samba-dcUpgrade libsmbclient-develUpgrade samba-winbind-modulesUpgrade samba-winbindUpgrade samba-dc-libsUpgrade samba-common-libsUpgrade samba-winbind-clientsUpgrade sambaUpgrade libwbclient-develUpgrade samba-winbind-krb5-locatorUpgrade samba-common-toolsUpgrade samba-clientUpgrade samba-libsUpgrade libsmbclientUpgrade samba-test-libs | Jul 8, 2026 | Jul 8, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-samba-dc-debuginfoUpgrade samba-ldb-ldap-modulesUpgrade samba-winbind-krb5-locator-debuginfoUpgrade samba-dc-libs-debuginfoUpgrade samba-krb5-printing-debuginfoUpgrade samba-krb5-printingUpgrade samba-ldb-ldap-modules-debuginfoUpgrade samba-libsUpgrade python3-samba-dcUpgrade samba-debuginfoUpgrade libnetapi-debuginfoUpgrade python3-sambaUpgrade samba-testUpgrade python3-samba-develUpgrade samba-toolsUpgrade samba-common-libs-debuginfoUpgrade samba-debugsourceUpgrade samba-client-libsUpgrade samba-test-debuginfoUpgrade libnetapiUpgrade libwbclientUpgrade libwbclient-debuginfoUpgrade samba-test-libsUpgrade samba-pidlUpgrade samba-commonUpgrade samba-winbind-clients-debuginfoUpgrade samba-test-libs-debuginfoUpgrade samba-vfs-iouringUpgrade samba-dcerpc-debuginfoUpgrade samba-common-tools-debuginfoUpgrade libsmbclient-debuginfoUpgrade samba-winbind-krb5-locatorUpgrade sambaUpgrade samba-winbind-clientsUpgrade samba-usersharesUpgrade samba-client-libs-debuginfoUpgrade samba-winbind-modules-debuginfoUpgrade samba-vfs-iouring-debuginfoUpgrade libsmbclient-develUpgrade samba-develUpgrade samba-dcerpcUpgrade samba-common-libsUpgrade samba-winbind-debuginfoUpgrade python3-samba-testUpgrade libsmbclientUpgrade samba-winbindUpgrade samba-client-debuginfoUpgrade samba-clientUpgrade libwbclient-develUpgrade libnetapi-develUpgrade samba-winbind-modulesUpgrade samba-libs-debuginfoUpgrade samba-dc-libsUpgrade samba-common-toolsUpgrade python3-samba-debuginfo | Jun 23, 2026 | Jun 8, 2026 |
| Debian | — | Upgrade samba | May 27, 2026 | May 27, 2026 |
| Suse | — | Upgrade libldb2-32bitUpgrade samba-ad-dc-libs-32bitUpgrade libldb-develUpgrade samba-winbind-libs-32bitUpgrade samba-libs-python3-32bitUpgrade samba-winbind-libsUpgrade samba-ad-dc-libsUpgrade samba-ad-dcUpgrade sambaUpgrade samba-winbindUpgrade samba-cephUpgrade samba-dcerpcUpgrade ctdb-pcp-pmdaUpgrade samba-ldb-ldapUpgrade samba-libs-32bitUpgrade libldb2Upgrade samba-docUpgrade samba-client-langUpgrade samba-python3Upgrade samba-client-libsUpgrade samba-libs-python3Upgrade samba-gpupdateUpgrade samba-develUpgrade libsamba-policy-develUpgrade samba-client-libs-32bitUpgrade samba-dsdb-modulesUpgrade samba-devel-32bitUpgrade samba-client-32bitUpgrade ldb-toolsUpgrade samba-clientUpgrade samba-testUpgrade libsamba-policy0-python3Upgrade ctdbUpgrade samba-toolUpgrade samba-winbind-libs-langUpgrade samba-libsUpgrade libsamba-policy0-python3-32bitUpgrade libsamba-policy-python3-develUpgrade python3-ldb | May 27, 2026 | May 27, 2026 |
| Ubuntu | — | Upgrade libwbclient0 (Ubuntu Pro)Upgrade libpam-winbind (Ubuntu Pro)Upgrade samba-common (Ubuntu Pro)Upgrade python3-samba (Ubuntu Pro)Upgrade samba-dev (Ubuntu Pro)Upgrade samba (Ubuntu Pro)Upgrade libsmbclient-dev (Ubuntu Pro)Upgrade libwbclient-dev (Ubuntu Pro)Upgrade samba-dsdb-modules (Ubuntu Pro)Upgrade registry-tools (Ubuntu Pro)Upgrade samba-libs (Ubuntu Pro)Upgrade smbclient (Ubuntu Pro)Upgrade libnss-winbind (Ubuntu Pro)Upgrade ctdb (Ubuntu Pro)Upgrade winbind (Ubuntu Pro)Upgrade samba-vfs-modules (Ubuntu Pro)Upgrade samba-common-bin (Ubuntu Pro)Upgrade libsmbclient (Ubuntu Pro)Upgrade samba | May 27, 2026 | May 26, 2026 |
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