Linux Kernel memcg Subsystem ipc/sem.c sem_alloc/find_alloc_undo resource consumption
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.6 | $0-$5k | 0.00 |
A vulnerability was found in Linux Kernel (Operating System) (unknown version) and classified as problematic. This issue affects the function sem_alloc/find_alloc_undo
of the file ipc/sem.c of the component memcg Subsystem. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:
A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resources, causing a denial of service. The highest threat from this vulnerability is to system availability.
The weakness was presented 08/24/2022. It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2021-3759 since 09/01/2021. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.
The exploit is available at lore.kernel.org. It is declared as proof-of-concept.
Applying a patch is able to eliminate this problem. The bugfix is ready for download at lore.kernel.org.
Product
Type
Vendor
Name
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: 6.0VulDB Meta Temp Score: 5.6
VulDB Base Score: 6.5
VulDB Temp Score: 5.6
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 5.5
NVD Vector: 🔍
CVSSv2
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Resource consumptionCWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
0-Day Time: 🔍
Patch: lore.kernel.org
Timeline
09/01/2021 🔍08/24/2022 🔍
08/24/2022 🔍
09/25/2022 🔍
Sources
Vendor: kernel.orgAdvisory: access.redhat.com
Status: Not defined
CVE: CVE-2021-3759 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 08/24/2022 07:41Updated: 09/25/2022 07:33
Changes: 08/24/2022 07:41 (44), 08/24/2022 07:42 (1), 09/25/2022 07:33 (10)
Complete: 🔍
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