Linux Kernel up to 5.0.2 inotify_user.c inotify_update_existing_watch resource management
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
4.4 | $0-$5k | 0.00 |
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 entries 131935, 131975 and 134037 are pretty similar.
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: 4.4VulDB 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: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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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: 🔍
NVD Base Score: 🔍
Exploiting
Class: Resource managementCWE: CWE-399 / CWE-404
ATT&CK: Unknown
Local: Yes
Remote: No
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔍
Patch: git.kernel.org
Timeline
03/11/2019 🔍03/18/2019 🔍
03/18/2019 🔍
03/21/2019 🔍
03/22/2019 🔍
08/04/2023 🔍
Sources
Vendor: kernel.orgAdvisory: FEDORA-2019-65c6d11eba⛔
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2019-9857 (🔍)
SecurityFocus: 107527 - Linux kernel 'fs/notify/inotify/inotify_user.c' Local Denial of Service Vulnerability
See also: 🔍
Entry
Created: 03/22/2019 09:16Updated: 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: 🔍
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