PT-2021-4809 · Linux+3 · Linux Kernel+3
Ga_Ryo
+1
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Published
2021-08-23
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Updated
2023-08-14
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CVE-2021-34866
CVSS v3.1
8.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux Kernel version 5.14-rc3
Description
This issue allows local attackers to escalate privileges on affected installations. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this issue. The specific flaw exists within the handling of eBPF programs, resulting from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this issue to escalate privileges and execute arbitrary code in the context of the kernel.
Recommendations
For Linux Kernel version 5.14-rc3, consider disabling the handling of eBPF programs as a temporary workaround until a patch is available. Restrict access to the eBPF subsystem to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.
Fix
Type Confusion
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Related Identifiers
Affected Products
Alt Linux
Astra Linux
Linux Kernel
Suse