Linux Kernel ebpf Verifier kernel/bpf/verifier.c adjust_scalar_min_max_vals dst_reg information exposure
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
4.2 | $0-$5k | 0.00 |
A vulnerability, which was classified as critical, has been found in Linux Kernel (Operating System) (version now known). This issue affects the function adjust_scalar_min_max_vals
of the file kernel/bpf/verifier.c of the component ebpf Verifier. The manipulation of the argument dst_reg
with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-202. When trying to keep information confidential, an attacker can often infer some of the information by using statistics. Impacted is confidentiality. The summary by CVE is:
A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.
The weakness was released 08/24/2022. The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2021-4159 since 12/23/2021. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.
Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.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: 4.3VulDB Meta Temp Score: 4.2
VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 4.4
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: Information exposureCWE: CWE-202 / CWE-200 / CWE-284
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
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: git.kernel.org
Timeline
12/23/2021 🔍08/24/2022 🔍
08/24/2022 🔍
09/25/2022 🔍
Sources
Vendor: kernel.orgAdvisory: git.kernel.org
Status: Confirmed
CVE: CVE-2021-4159 (🔍)
Entry
Created: 08/24/2022 22:44Updated: 09/25/2022 13:28
Changes: 08/24/2022 22:44 (44), 09/25/2022 13:28 (10)
Complete: 🔍
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