Linux Kernel 3.19.8 x86_64 NT Flag switch_to.h Leak denial of service
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
3.5 | $0-$5k | 0.00 |
A vulnerability, which was classified as problematic, was found in Linux Kernel 3.19.8 (Operating System). This affects some unknown processing in the library switch_to.h of the component x86_64 NT Flag Handler. The manipulation with an unknown input leads to a denial of service vulnerability (Leak). CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.
The weakness was published 08/24/2015 as confirmed mailinglist post (oss-sec). It is possible to read the advisory at seclists.org. This vulnerability is uniquely identified as CVE-2015-6666 since 08/24/2015. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The reason for this vulnerability is this part of code:
#define SAVE_CONTEXT "pushq %%rbp ; movq %%rsi,%%rbp\n\t" #define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp\t"
The vulnerability scanner Nessus provides a plugin with the ID 86078 (Fedora 21 : kernel-4.1.7-100.fc21 (2015-15933)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l.
Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:
#define SAVE_CONTEXT "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t" #define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
The vulnerability is also documented in the databases at X-Force (105907) and Tenable (86078).
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 4.0VulDB Meta Temp Score: 3.5
VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Name: LeakClass: Denial of service / Leak
CWE: CWE-404
ATT&CK: Unknown
Local: Yes
Remote: No
Availability: 🔍
Status: Unproven
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 86078
Nessus Name: Fedora 21 : kernel-4.1.7-100.fc21 (2015-15933)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 867773
OpenVAS Name: Fedora Update for kernel FEDORA-2015-15933
OpenVAS File: 🔍
OpenVAS Family: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Patch: git.kernel.org
Timeline
08/24/2015 🔍08/24/2015 🔍
08/28/2015 🔍
09/22/2015 🔍
09/23/2015 🔍
09/21/2018 🔍
Sources
Vendor: kernel.orgAdvisory: seclists.org
Status: Confirmed
CVE: CVE-2015-6666 (🔍)
X-Force: 105907 - Linux Kernel x86_64 NT flag denial of service
Entry
Created: 08/28/2015 13:15Updated: 09/21/2018 10:05
Changes: 08/28/2015 13:15 (55), 09/21/2018 10:05 (9)
Complete: 🔍
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