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Vulnerabilities

Vulnerability · CVE-2026-12505

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 envir

Published Jun 18, 2026 · catalog updated Oct 15, 2026 · A flaw was found

Check if you run it

No confirmed exploitation is on record for CVE-2026-12505. EPSS is 0.16%. Act only if a listed version of A flaw was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.16%
Remediation
Advisory link
Affected products
Debian:12 cifs-utils · Debian:13 cifs-utils · Debian:14 cifs-utils

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 cifs-utils2:7.0-2, 2:7.0-2.1, 2:7.1-1
  • Debian:13 cifs-utils2:7.4-1, 2:7.8-1
  • Debian:14 cifs-utils0 → 2:7.8-1

How to fix CVE-2026-12505

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-12505. EPSS is 0.16%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with 2:7.0-2, 2:7.0-2.1, 2:7.1-1, 2:7.4-1, 2:7.8-1, 0 → 2:7.8-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-250: Execution with Unnecessary Privileges. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 18, 2026 · NIST NVD

    Detected

    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 force

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 force

  3. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    cifs-utils fixed in 2:7.8-1

  4. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    cifs-utils fixed in 2:7.8-1

  5. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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 force

Sources

  • CVE.orgVulnerability recordCVE-2026-12505

    Official CVE identifier

    cve.org
  • Debian Security AdvisoriesVendor advisoryCVE-2026-12505

    [SECURITY] [DSA 6567-1] cifs-utils security update

    lists.debian.org
  • FIRST EPSSExploitation probabilityCVE-2026-12505

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-12505

    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

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-12505
    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.