VDB-132077 · CVE-2019-9857 · BID 107527

Linux Kernel up to 5.0.2 inotify_user.c inotify_update_existing_watch resource management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.0.2. Affected by this vulnerability is the function inotify_update_existing_watch of the file fs/notify/inotify/inotify_user.c. The manipulation leads to resource management. This vulnerability is uniquely identified as CVE-2019-9857. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.0.2 (Operating System). This issue affects the function inotify_update_existing_watch of the file fs/notify/inotify/inotify_user.c. The manipulation with an unknown input leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability. The summary by CVE is:

In the Linux kernel through 5.0.2, the function inotify_update_existing_watch() in fs/notify/inotify/inotify_user.c neglects to call fsnotify_put_mark() with IN_MASK_CREATE after fsnotify_find_mark(), which will cause a memory leak (aka refcount leak). Finally, this will cause a denial of service.

The bug was discovered 03/11/2019. The weakness was disclosed 03/21/2019 (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2019-9857 since 03/18/2019. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 10 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277783 (Fedora Security Update for kernel-headers kernel-tools kernel (FEDORA-2019-65c6d11eba)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107527†). The entries VDB-131935, VDB-131975 and VDB-134037 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

03/11/2019 🔍
03/18/2019 +7 days 🔍
03/18/2019 +0 days 🔍
03/21/2019 +3 days 🔍
03/22/2019 +1 days 🔍
08/04/2023 +1596 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2019-65c6d11eba⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-9857 (🔍)
GCVE (CVE): GCVE-0-2019-9857
GCVE (VulDB): GCVE-100-132077
SecurityFocus: 107527 - Linux kernel 'fs/notify/inotify/inotify_user.c' Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/22/2019 09:16
Updated: 08/04/2023 11:37
Changes: 03/22/2019 09:16 (62), 05/19/2020 09:10 (5), 08/04/2023 11:37 (4)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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