MediumCVE-2017-15129

Linux Kernel: Race Condition (CVE-2017-15129)

Published 09.01.2018Sources: CVE.org

What is affected, what to do

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected: Linux kernel v4.0-rc1 through v4.15-rc5 eq Linux kernel v4.0-rc1 through v4.15-rc5..Linux kernel v4.0-rc1 through v4.15-rc5

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Metrics

4.7

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

4.7

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: CVE.org

0.4 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 29.3

Show all metrics

Severity: Medium
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: 30.33 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: 4.7 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: 4.7
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: 0.4 %; 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: 29.3; Elevated — this CVE ranks above at least 10% of all CVEs scored today.
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: 09.01.2018
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-362

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: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
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

A use-after-free vulnerability was found in network namespaces code affecting the Linux kernel before 4.14.11. The function get_net_ns_by_id() in net/core/net_namespace.c does not check for the net::count value after it has found a peer network in netns_ids idr, which could lead to double free and memory corruption. This vulnerability could allow an unprivileged local user to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is thought to be unlikely.

Source: NVD (NIST), cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
—	Linux kernel v4.0-rc1 through v4.15-rc5	`Linux kernel v4.0-rc1 through v4.15-rc5`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	redhat	enterprise_linux	`7.0`
Linux	redhat	enterprise_linux_compute_node_eus	`7.4`
Linux	redhat	enterprise_linux_desktop	`7.0`
Linux	redhat	enterprise_linux_eus	`7.4`
Linux	redhat	enterprise_linux_eus	`7.6`
Linux	redhat	enterprise_linux_eus	`7.7`
Linux	redhat	enterprise_linux_for_ibm_z_systems	`7.0`
Linux	redhat	enterprise_linux_for_ibm_z_systems_eus	`7.4`
Linux	redhat	enterprise_linux_for_power_big_endian	`7.0`
Linux	redhat	enterprise_linux_for_power_big_endian_eus	`7.4`
Linux	redhat	enterprise_linux_for_power_little_endian_eus	`7.4`
Linux	redhat	enterprise_linux_for_real_time	`7.0`
Linux	redhat	enterprise_linux_for_real_time_for_nfv	`7`
Linux	redhat	enterprise_linux_for_scientific_computing	`7.0`
Linux	redhat	enterprise_linux_server	`7.0`
Linux	redhat	enterprise_linux_server_aus	`7.4`
Linux	redhat	enterprise_linux_server_tus	`7.4`
Linux	redhat	enterprise_linux_server_tus	`7.6`
Linux	redhat	enterprise_linux_server_tus	`7.7`
Linux	redhat	enterprise_linux_server_update_services_for_sap_solutions	`7.4`
Linux	redhat	enterprise_linux_workstation	`7.0`
Linux	linux	linux_kernel	`4.15`
Linux	linux	linux_kernel	—
Linux	canonical	ubuntu_linux	`14.04`

Weakness classes (CWE)

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Class
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Entry at MITRE CWE-362

References & sources

usn.ubuntu.comUSN-3617-1Vendor advisory, x_refsource_UBUNTU, Third-party advisory
usn.ubuntu.comUSN-3619-2Vendor advisory, x_refsource_UBUNTU, Third-party advisory
usn.ubuntu.comUSN-3617-3Vendor advisory, x_refsource_UBUNTU, Third-party advisory
marc.info?l=linux-netdev&m=151370451121029&w=2x_refsource_MISC, Mailing list, Patch, Third-party advisory
marc.info?t=151370468900001&r=1&w=2x_refsource_MISC, Mailing list, Third-party advisory
usn.ubuntu.comUSN-3632-1Vendor advisory, x_refsource_UBUNTU, Third-party advisory
bugzilla.redhat.comshow_bug.cgi?id=1531174x_refsource_MISC, Issue tracking, Patch, Third-party advisory
kernel.orgpub/linux/kernel/v4.x/ChangeLog-4.14.11x_refsource_MISC, Release notes
github.comtorvalds/linux/commit/21b5944350052d2583e82dd59b19a9ba94a007f0x_refsource_MISC, Patch
access.redhat.comRHSA-2018:1062Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comRHSA-2018:0654Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comsecurity/cve/CVE-2017-15129x_refsource_MISC, Third-party advisory
securityfocus.com102485Vulnerability database, x_refsource_BID, Broken link
seclists.orgoss-sec/2018/q1/7x_refsource_MISC, Mailing list, Third-party advisory
access.redhat.comRHSA-2018:0676Vendor advisory, x_refsource_REDHAT, Third-party advisory
git.kernel.orgcgit/linux/kernel/git/torvalds/linux.git/commit/?id=21b59443500…x_refsource_MISC, Patch
usn.ubuntu.comUSN-3617-2Vendor advisory, x_refsource_UBUNTU, Third-party advisory
usn.ubuntu.comUSN-3619-1Vendor advisory, x_refsource_UBUNTU, Third-party advisory
access.redhat.comRHSA-2019:1946Vendor advisory, x_refsource_REDHAT, Third-party advisory

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<a href="https://intel.neosec.eu/en/cve/CVE-2017-15129"><img src="https://intel.neosec.eu/badge/cve/CVE-2017-15129.svg?lang=en" alt="CVE-2017-15129 – NEOSEC Intel" height="20"></a>