Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-240
Advisory Released Date: 2026-10-26
Advisory Updated Date: 2026-11-02
Severity:
Important
Issue Overview:
Package updates are available for Amazon Linux 2027 that fix the following vulnerabilities:
CVE-2026-104715:
A flaw was found in cifs-utils. This flaw allows an unprivileged local user to achieve privilege escalation. When a privileged service mounts a Common Internet File System (CIFS) share using a user-controlled credentials file, input values are not properly sanitized before being assembled into mount options. A local attacker can exploit this vulnerability to inject unauthorized mount options, allowing them to bypass permission checks and execute files with administrative (root) privileges.
Affected Packages:
cifs-utils
Issue Correction:
Run dnf update cifs-utils --releasever 2027.0.20261026 or dnf update --advisory ALAS2027-2026-240 --releasever 2027.0.20261026 to update your system.
New Packages:
aarch64:
pam_cifscreds-debuginfo-7.7-2.amzn2027.0.1.aarch64
cifs-utils-debuginfo-7.7-2.amzn2027.0.1.aarch64
cifs-utils-debugsource-7.7-2.amzn2027.0.1.aarch64
pam_cifscreds-7.7-2.amzn2027.0.1.aarch64
cifs-utils-devel-7.7-2.amzn2027.0.1.aarch64
cifs-utils-info-7.7-2.amzn2027.0.1.aarch64
cifs-utils-7.7-2.amzn2027.0.1.aarch64
src:
cifs-utils-7.7-2.amzn2027.0.1.src
x86_64:
cifs-utils-info-7.7-2.amzn2027.0.1.x86_64
cifs-utils-devel-7.7-2.amzn2027.0.1.x86_64
pam_cifscreds-7.7-2.amzn2027.0.1.x86_64
cifs-utils-debugsource-7.7-2.amzn2027.0.1.x86_64
cifs-utils-7.7-2.amzn2027.0.1.x86_64
pam_cifscreds-debuginfo-7.7-2.amzn2027.0.1.x86_64
cifs-utils-debuginfo-7.7-2.amzn2027.0.1.x86_64