SB20261111178 - Ubuntu update for linux-azure-fde
Published: November 11, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Use of uninitialized resource (CVE-ID: CVE-2025-21656)
CWE-ID: CWE-908 - Use of Uninitialized Resource
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to use of uninitialized resource within the drivetemp_scsi_command() function in drivers/hwmon/drivetemp.c. A local user can perform a denial of service (DoS) attack.
2) Integer underflow (CVE-ID: CVE-2026-63940)
CWE-ID: CWE-191 - Integer underflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an integer underflow in KVM SEV Port I/O handling in arch/x86/kvm/svm/sev.c when processing Port I/O requests with a length or count of 0. A local user can trigger a zero-length Port I/O request to cause a denial of service.
The issue affects the handling of VMGEXIT and string I/O requests in the KVM SEV implementation.
3) Out-of-bounds read (CVE-ID: CVE-2026-74350)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the ocfs2 fast symlink read path when processing a malformed zero-cluster symlink inode. A local user can provide a crafted filesystem image containing an invalid fast symlink to disclose sensitive information.
The issue is triggered when the inline symlink payload is not NUL-terminated at the recorded size or when the recorded size exceeds the inline fast-symlink capacity.
Remediation
Install update from vendor's website.