ALAS2-2026-3886

Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3886
Advisory Released Date: 2026-08-31
Advisory Updated Date: 2026-08-31

Severity: Important

References: CVE-2026-15779 CVE-2026-58222 CVE-2026-58224 CVE-2026-6949
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

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. (CVE-2026-15779)

Samba AD LDAP Compare filter injection and trusted-request confusion disclose protected attributes (CVE-2026-58222)

The CTDB protocol has bounds checking issues

NOTE: https://www.samba.org/samba/security/CVE-2026-58224-advisory.html (CVE-2026-58224)

TSIG packet with name compression can crash DNS (CVE-2026-6949)

Affected Packages:

samba

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update samba or yum update --advisory ALAS2-2026-3886 to update your system.

New Packages:

aarch64:
    samba-4.10.16-24.amzn2.0.9.aarch64
    samba-client-4.10.16-24.amzn2.0.9.aarch64
    samba-client-libs-4.10.16-24.amzn2.0.9.aarch64
    samba-common-libs-4.10.16-24.amzn2.0.9.aarch64
    samba-common-tools-4.10.16-24.amzn2.0.9.aarch64
    samba-dc-4.10.16-24.amzn2.0.9.aarch64
    samba-dc-libs-4.10.16-24.amzn2.0.9.aarch64
    samba-devel-4.10.16-24.amzn2.0.9.aarch64
    samba-krb5-printing-4.10.16-24.amzn2.0.9.aarch64
    samba-libs-4.10.16-24.amzn2.0.9.aarch64
    libsmbclient-4.10.16-24.amzn2.0.9.aarch64
    libsmbclient-devel-4.10.16-24.amzn2.0.9.aarch64
    libwbclient-4.10.16-24.amzn2.0.9.aarch64
    libwbclient-devel-4.10.16-24.amzn2.0.9.aarch64
    samba-python-4.10.16-24.amzn2.0.9.aarch64
    samba-python-test-4.10.16-24.amzn2.0.9.aarch64
    samba-test-4.10.16-24.amzn2.0.9.aarch64
    samba-test-libs-4.10.16-24.amzn2.0.9.aarch64
    samba-winbind-4.10.16-24.amzn2.0.9.aarch64
    samba-winbind-clients-4.10.16-24.amzn2.0.9.aarch64
    samba-winbind-krb5-locator-4.10.16-24.amzn2.0.9.aarch64
    samba-winbind-modules-4.10.16-24.amzn2.0.9.aarch64
    ctdb-4.10.16-24.amzn2.0.9.aarch64
    ctdb-tests-4.10.16-24.amzn2.0.9.aarch64
    samba-debuginfo-4.10.16-24.amzn2.0.9.aarch64

i686:
    samba-4.10.16-24.amzn2.0.9.i686
    samba-client-4.10.16-24.amzn2.0.9.i686
    samba-client-libs-4.10.16-24.amzn2.0.9.i686
    samba-common-libs-4.10.16-24.amzn2.0.9.i686
    samba-common-tools-4.10.16-24.amzn2.0.9.i686
    samba-dc-4.10.16-24.amzn2.0.9.i686
    samba-dc-libs-4.10.16-24.amzn2.0.9.i686
    samba-devel-4.10.16-24.amzn2.0.9.i686
    samba-krb5-printing-4.10.16-24.amzn2.0.9.i686
    samba-libs-4.10.16-24.amzn2.0.9.i686
    libsmbclient-4.10.16-24.amzn2.0.9.i686
    libsmbclient-devel-4.10.16-24.amzn2.0.9.i686
    libwbclient-4.10.16-24.amzn2.0.9.i686
    libwbclient-devel-4.10.16-24.amzn2.0.9.i686
    samba-python-4.10.16-24.amzn2.0.9.i686
    samba-python-test-4.10.16-24.amzn2.0.9.i686
    samba-test-4.10.16-24.amzn2.0.9.i686
    samba-test-libs-4.10.16-24.amzn2.0.9.i686
    samba-winbind-4.10.16-24.amzn2.0.9.i686
    samba-winbind-clients-4.10.16-24.amzn2.0.9.i686
    samba-winbind-krb5-locator-4.10.16-24.amzn2.0.9.i686
    samba-winbind-modules-4.10.16-24.amzn2.0.9.i686
    ctdb-4.10.16-24.amzn2.0.9.i686
    ctdb-tests-4.10.16-24.amzn2.0.9.i686
    samba-debuginfo-4.10.16-24.amzn2.0.9.i686

noarch:
    samba-common-4.10.16-24.amzn2.0.9.noarch
    samba-pidl-4.10.16-24.amzn2.0.9.noarch

src:
    samba-4.10.16-24.amzn2.0.9.src

x86_64:
    samba-4.10.16-24.amzn2.0.9.x86_64
    samba-client-4.10.16-24.amzn2.0.9.x86_64
    samba-client-libs-4.10.16-24.amzn2.0.9.x86_64
    samba-common-libs-4.10.16-24.amzn2.0.9.x86_64
    samba-common-tools-4.10.16-24.amzn2.0.9.x86_64
    samba-dc-4.10.16-24.amzn2.0.9.x86_64
    samba-dc-libs-4.10.16-24.amzn2.0.9.x86_64
    samba-devel-4.10.16-24.amzn2.0.9.x86_64
    samba-vfs-glusterfs-4.10.16-24.amzn2.0.9.x86_64
    samba-krb5-printing-4.10.16-24.amzn2.0.9.x86_64
    samba-libs-4.10.16-24.amzn2.0.9.x86_64
    libsmbclient-4.10.16-24.amzn2.0.9.x86_64
    libsmbclient-devel-4.10.16-24.amzn2.0.9.x86_64
    libwbclient-4.10.16-24.amzn2.0.9.x86_64
    libwbclient-devel-4.10.16-24.amzn2.0.9.x86_64
    samba-python-4.10.16-24.amzn2.0.9.x86_64
    samba-python-test-4.10.16-24.amzn2.0.9.x86_64
    samba-test-4.10.16-24.amzn2.0.9.x86_64
    samba-test-libs-4.10.16-24.amzn2.0.9.x86_64
    samba-winbind-4.10.16-24.amzn2.0.9.x86_64
    samba-winbind-clients-4.10.16-24.amzn2.0.9.x86_64
    samba-winbind-krb5-locator-4.10.16-24.amzn2.0.9.x86_64
    samba-winbind-modules-4.10.16-24.amzn2.0.9.x86_64
    ctdb-4.10.16-24.amzn2.0.9.x86_64
    ctdb-tests-4.10.16-24.amzn2.0.9.x86_64
    samba-debuginfo-4.10.16-24.amzn2.0.9.x86_64

Additional References

Red Hat: CVE-2026-15779, CVE-2026-58222, CVE-2026-58224, CVE-2026-6949

Mitre: CVE-2026-15779, CVE-2026-58222, CVE-2026-58224, CVE-2026-6949