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Fencer Intel
high 7.8

CVE-2026-12505 json

Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall

published 4mo ago modified 5d ago also EUVD-2026-37834

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:7.6-1.el10_2
  • Red Hat Red Hat Enterprise Linux 8 0:7.0-5.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:7.6-2.el9_8
  • Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202607220526-0
  • cifs-utils Debian 13 2:7.4-1+deb13u1
  • cifs-utils Debian 14 2:7.8-1

debian advisories DEBIAN-CVE-2026-12505

  • cifs-utils Ubuntu 22.04 LTS 2:6.14-1ubuntu0.6
  • cifs-utils Ubuntu 24.04 LTS 2:7.0-2ubuntu0.5
  • cifs-utils Ubuntu 26.04 LTS 2:7.4-1ubuntu0.26.04.3

ubuntu advisories UBUNTU-CVE-2026-12505

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cifs-utils RHEL 8 7.0-5.el8_10
  • pam_cifscreds RHEL 8 7.0-5.el8_10
  • cifs-utils RHEL 9 7.6-2.el9_8
  • pam_cifscreds RHEL 9 7.6-2.el9_8
  • cifs-utils RHEL 10.2 7.6-1.el10_2
  • pam_cifscreds RHEL 10.2 7.6-1.el10_2

red hat advisories RHSA-2026:39575RHSA-2026:39576RHSA-2026:32990

  • cifs-utils Linux Micro 6.1 7.0-slfo.1.1_4.1
  • cifs-utils SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 6.15-150400.3.21.1
  • cifs-utils SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 6.9-13.26.1

suse advisories SUSE-SU-2026:22888-1SUSE-SU-2026:2700-1SUSE-SU-2026:2699-1

  • cifs-utils AlmaLinux 8 7.0-5.el8_10
  • pam_cifscreds AlmaLinux 8 7.0-5.el8_10
  • cifs-utils AlmaLinux 9 7.6-2.el9_8
  • pam_cifscreds AlmaLinux 9 7.6-2.el9_8

almalinux advisories ALSA-2026:39575ALSA-2026:39576

  • cifs-utils Rocky Linux 8 7.0-5.el8_10
  • cifs-utils Rocky Linux 9 7.6-2.el9_8
  • cifs-utils Rocky Linux 10 7.6-1.el10_2

rocky linux advisories RLSA-2026:39575RLSA-2026:39576RLSA-2026:32990

  • cifs-utils Azure Linux 3.0 7.6-1

azure linux advisories AZL-91131

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12505 updated cvss 7.8

cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall

  • Red Hat Enterprise Linux 6 cifs-utils
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) pam_cifscreds 7.6-2.el9_8
    fixed: vendor fix RHSA-2026:39576
  • Red Hat Enterprise Linux AppStream (v. 10) pam_cifscreds 7.6-1.el10_2
    fixed: vendor fix RHSA-2026:32990
  • Red Hat Enterprise Linux BaseOS (v. 8) cifs-utils 7.0-5.el8_10, pam_cifscreds 7.0-5.el8_10
    fixed: vendor fix RHSA-2026:39575
  • Red Hat Enterprise Linux BaseOS (v. 9) cifs-utils 7.6-2.el9_8
    fixed: vendor fix RHSA-2026:39576
  • Red Hat Enterprise Linux BaseOS (v. 10) cifs-utils 7.6-1.el10_2
    fixed: vendor fix RHSA-2026:32990
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) cifs-utils-devel 7.6-2.el9_8, cifs-utils-debuginfo 7.6-2.el9_8, cifs-utils-debugsource 7.6-2.el9_8, pam_cifscreds-debuginfo 7.6-2.el9_8
    fixed: vendor fix RHSA-2026:39576
show 4 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) cifs-utils-devel 7.6-1.el10_2, cifs-utils-debuginfo 7.6-1.el10_2, cifs-utils-debugsource 7.6-1.el10_2, pam_cifscreds-debuginfo 7.6-1.el10_2
    fixed: vendor fix RHSA-2026:32990
  • Red Hat Enterprise Linux CRB (v. 8) cifs-utils-devel 7.0-5.el8_10, cifs-utils-debuginfo 7.0-5.el8_10, cifs-utils-debugsource 7.0-5.el8_10, pam_cifscreds-debuginfo 7.0-5.el8_10
    fixed: vendor fix RHSA-2026:39575
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202607220526
    fixed: vendor fix RHSA-2026:44232
  • Red Hat Enterprise Linux 7 cifs-utils
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-250 Execution with Unnecessary Privileges

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.