Linux Kernel up to 5.15.2 Quota Tree fs/quota/quota_tree.c use after free
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.0 | $0-$5k | 0.00 |
A vulnerability classified as critical was found in Linux Kernel up to 5.15.2 (Operating System). Affected by this vulnerability is an unknown functionality of the file fs/quota/quota_tree.c of the component Quota Tree Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.
The weakness was disclosed 03/18/2022 as Bug 214655. It is possible to read the advisory at bugzilla.kernel.org. This vulnerability is known as CVE-2021-45868 since 12/27/2021. Technical details and also a public exploit are known.
It is possible to download the exploit at bugzilla.kernel.org. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.
Upgrading to version 5.15.3 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.
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: 5.5VulDB Meta Temp Score: 5.0
VulDB Base Score: 5.5
VulDB Temp Score: 5.0
VulDB Vector: 🔍
VulDB Reliability: 🔍
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: 🔍
Exploiting
Class: Use after freeCWE: CWE-416 / CWE-119
ATT&CK: Unknown
Local: No
Remote: Partially
Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: Kernel 5.15.3
Patch: git.kernel.org
Timeline
12/27/2021 🔍03/18/2022 🔍
03/18/2022 🔍
03/18/2022 🔍
Sources
Vendor: kernel.orgAdvisory: Bug 214655
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2021-45868 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 03/18/2022 11:30Changes: 03/18/2022 11:30 (48)
Complete: 🔍
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