Vulnerability · Published Jan 25, 2022 · Assigned by zdi
CVE-2021-34866
High 8.8
In plain English
A high-severity type confusion in Kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-14689.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.14.6-1 | DEBIAN-CVE-2021-34866 |
| Debian:13 | linux | 5.14.6-1 | DEBIAN-CVE-2021-34866 |
| Debian:14 | linux | 5.14.6-1 | DEBIAN-CVE-2021-34866 |
Affected products (as reported)
Weakness: CWE-843 · Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://www.zerodayinitiative.com/advisories/ZDI-21-1148/ x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20220217-0008/ x_refsource_CONFIRM