Samba Cifs-utils: Stack-Based Buffer Overflow (CVE-2022-27239)
Published Sources: Debian, CVE.org
What is affected, what to do
In cifs-utils through 6.14, a stack-based buffer overflow when parsing the mount.cifs ip= command-line argument could lead to local attackers gaining root privileges.
Update Samba Cifs-utils to version 6.15.
- Affected
- Samba Cifs-utils
lt *..6.15 - Debian Linux
eq 9.0..9.0 - Debian Linux
eq 10.0..10.0 - Debian Linux
eq 11.0..11.0 - SUSE CaaS Platform
eq 4.0..4.0 - SUSE Enterprise Storage
eq 6.0..6.0 - SUSE Enterprise Storage
eq 7.0..7.0 - SUSE Linux Enterprise Point Of Service
eq 11.0..11.0 - SUSE Linux Enterprise Storage
eq 7.1..7.1 - SUSE Manager Proxy
eq 4.1..4.1 - SUSE Manager Proxy
eq 4.2..4.2 - SUSE Manager Proxy
eq 4.3..4.3 - SUSE Manager Retail Branch Server
eq 4.1..4.1 - SUSE Manager Retail Branch Server
eq 4.2..4.2 - SUSE Manager Retail Branch Server
eq 4.3..4.3 - SUSE Manager Server
eq 4.1..4.1 - SUSE Manager Server
eq 4.2..4.2 - SUSE Manager Server
eq 4.3..4.3 - Suse Openstack Cloud
eq 8.0..8.0 - Suse Openstack Cloud
eq 9.0..9.0 - SUSE Openstack Cloud Crowbar
eq 8.0..8.0 - SUSE Openstack Cloud Crowbar
eq 9.0..9.0 - SUSE Linux Enterprise Desktop
eq 15..15 - SUSE Linux Enterprise High Performance Computing
eq 12.0..12.0 - SUSE Linux Enterprise High Performance Computing
eq 15.0..15.0 - SUSE Linux Enterprise Micro
eq 5.2..5.2 - SUSE Linux Enterprise Real Time
eq 15.0..15.0 - SUSE Linux Enterprise Server
eq 11..11 - SUSE Linux Enterprise Server
eq 12..12 - SUSE Linux Enterprise Server
eq 15..15 - SUSE Linux Enterprise Software Development Kit (SDK)
eq 12..12 - HP Helion Openstack
eq 8.0..8.0 - Fedora
eq 34..34 - Fedora
eq 35..35 - Fedora
eq 36..36
- Samba Cifs-utils
- Fixed in
- Samba Cifs-utils
6.15
- Samba Cifs-utils
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
7.8
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
7.8
CVSS v3
Severity High on the scale from 0 to 10.
Source: Debian, CVE.org
0.6 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 47.5
Show all metrics
- Severity
- High
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 57.78 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 7.8 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 7.8
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.6 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 47.5
- High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
In cifs-utils through 6.14, a stack-based buffer overflow when parsing the mount.cifs ip= command-line argument could lead to local attackers gaining root privileges.
Source: Debian Security Advisories, NVD (NIST), cvelistv5
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| hp | helion_openstack |
|
|
| samba | cifs-utils |
|
|
| suse | caas_platform |
|
|
| suse | enterprise_storage |
|
|
| suse | linux_enterprise_point_of_service |
|
|
| suse | linux_enterprise_storage |
|
|
| suse | manager_proxy |
|
|
| suse | manager_retail_branch_server |
|
|
| suse | manager_server |
|
|
| suse | openstack_cloud |
|
|
| suse | openstack_cloud_crowbar |
|
|
Vendors and products
- Debian Debian Cifs-Utils
- Debian Debian Linux
- Fedora Project Infrastructure Fedora
- Hewlett Packard Enterprise Helion Openstack
- Samba Cifs-utils
- SUSE SUSE CaaS Platform 4.5
- SUSE Enterprise Storage
- SUSE SUSE Linux Enterprise Desktop
- SUSE Linux Enterprise High Performance Computing
- SUSE Linux Enterprise Micro
- SUSE Linux Enterprise Real Time
- SUSE SUSE Linux Enterprise Server
Affected operating systems
| Linux | debian | cifs-utils | bullseye |
| Linux | debian | cifs-utils | buster |
| Linux | debian | debian_linux | 10.0 |
| Linux | debian | debian_linux | 11.0 |
| Linux | debian | debian_linux | 9.0 |
| Linux | suse | linux_enterprise_desktop | 15 |
| Linux | suse | linux_enterprise_high_performance_computing | 12.0 |
| Linux | suse | linux_enterprise_high_performance_computing | 15.0 |
| Linux | suse | linux_enterprise_micro | 5.2 |
| Linux | suse | linux_enterprise_real_time | 15.0 |
| Linux | suse | linux_enterprise_server | 11 |
| Linux | suse | linux_enterprise_server | 12 |
| Linux | suse | linux_enterprise_server | 15 |
| Linux | suse | linux_enterprise_software_development_kit | 12 |
| Other | fedoraproject | fedora | 34 |
| Other | fedoraproject | fedora | 35 |
| Other | fedoraproject | fedora | 36 |
References & sources
- bugzilla.suse.comshow_bug.cgi?id=1197216Issue tracking, Patch, Third-party advisory
- wiki.robotz.comindex.php/Linux_CIFS_Utils_and_SambaThird-party advisory
- github.compiastry/cifs-utils/pull/7/commits/955fb147e97a6a74e1aaa65766de9…Patch, Third-party advisory
- bugzilla.samba.orgshow_bug.cgi?id=15025Issue tracking, Permissions required, Vendor advisory
- github.compiastry/cifs-utils/pull/7Issue tracking, Patch, Third-party advisory
- lists.fedoraproject.orgFEDORA-2022-eb2d3ca94dVendor advisory
- lists.fedoraproject.orgFEDORA-2022-7fda04ab5aVendor advisory
- lists.fedoraproject.orgFEDORA-2022-34de4f833dVendor advisory
- lists.debian.org[debian-lts-announce] 20220516 [SECURITY] [DLA 3009-1] cifs-utils security updateMailing list, Mailing list, Third-party advisory
- debian.orgDSA-5157Vendor advisory, Third-party advisory
- security.gentoo.orgGLSA-202311-05Vendor advisory
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2022-27239"><img src="https://intel.neosec.eu/badge/cve/CVE-2022-27239.svg?lang=en" alt="CVE-2022-27239 – NEOSEC Intel" height="20"></a>