Ubuntu USN · USN-8496-2

cifs-utils regression

Published: Fri, 03 Jul 2026 18:49

Summary

USN-8496-1 introduced a regression in cifs-utils

Details

USN-8496-1 fixed a vulnerability in cifs-utils. Unfortunately, the fix introduced a regression with Kerberos mounts. This update reverts the security update until a complete fix is available. We apologize for the inconvenience. Original advisory details: It was discovered that cifs-utils incorrectly dropped root privileges before looking up user information. A local attacker could possibly use this issue to execute arbitrary code as the root user.

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu jammy

cifs-utils→2:6.14-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 2:6.14-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
cifs-utils→2:6.14-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 2:6.14-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

cifs-utils→2:7.0-2ubuntu0.4apt_upgrade
Standard apt upgrade. Install 2:7.0-2ubuntu0.4 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
cifs-utils→2:7.0-2ubuntu0.4apt_upgrade
Standard apt upgrade. Install 2:7.0-2ubuntu0.4 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu questing

cifs-utils→2:7.4-1ubuntu0.25.10.2apt_upgrade
Standard apt upgrade. Install 2:7.4-1ubuntu0.25.10.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
cifs-utils→2:7.4-1ubuntu0.25.10.2apt_upgrade
Standard apt upgrade. Install 2:7.4-1ubuntu0.25.10.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu resolute

cifs-utils→2:7.4-1ubuntu0.26.04.2apt_upgrade
Standard apt upgrade. Install 2:7.4-1ubuntu0.26.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
cifs-utils→2:7.4-1ubuntu0.26.04.2apt_upgrade
Standard apt upgrade. Install 2:7.4-1ubuntu0.26.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y cifs-utils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8496-2?

5-second check on your actual server. Reads /etc/os-release, uname -r, and dpkg-query; matches against the live USN + Debian Security Tracker feeds; tells you whether USN-8496-2 (and any other live CVE) applies. Anonymous, no signup.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan Read the bash source first

References

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