PT-2021-8241 · Linux+3 · Linux Kernel+3
N4Ke4Mry
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Published
2021-12-14
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Updated
2024-12-02
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CVE-2021-47608
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to a kernel address leakage in the Linux kernel's bpf component, specifically in the atomic fetch functionality. This leakage can allow unprivileged users to leak kernel pointers, potentially leading to a denial of service. The vulnerability arises from a bug in the check mem access() handling, which can be exploited by an atomic fetch/and operation with -1 on a stack destination holding a spilled pointer. This can migrate the spilled register type into a scalar, allowing it to be exported out of the program by dumping it into a map value.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Memory Leak
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Red Os
Suse