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CVE-2019-5489 is an information-disclosure vulnerability in the Linux kernel mincore() implementation in mm/mincore.c through version 4.19.13. The implementation permits a local process to observe page-cache residency and access patterns associated with other processes on the same system. By measuring page-granularity cache access timing, an attacker may infer sensitive information, including memory-access patterns, executed code paths, cryptographic behavior, or data. Limited remote observation is also possible in scenarios involving latency differences when accessing public files through an Apache HTTP Server.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept (PoC) exploit for CVE-2019-5489, a page cache side channel vulnerability in the Linux kernel (prior to version 5.0). The exploit demonstrates a covert channel between two processes (sender and receiver) running on the same machine. The sender process encodes secret data (the string 'PassWord') by manipulating the state of the page cache, while the receiver process decodes the data by probing the cache state using the mincore() system call. The repository includes the following main files: - sender.c: Implements the sender process, which transmits data via the page cache side channel. - receiver.c: Implements the receiver process, which receives and reconstructs the secret data. - covert_channel.c/h: Defines the aligned functions used as cache lines for signaling and data transmission. - util.c/h: Provides utility functions for checking cache state and debugging. - Makefile: Automates building the shared library and binaries, and creates a large file ('file') used for cache eviction. The exploit requires a vulnerable Linux kernel (pre-5.0) and disables swap for reliability. No network or remote attack vector is present; the attack is purely local and requires the ability to run code on the target system. The only fingerprintable endpoint is the use of a large file named 'file' for cache eviction. The code is a clear and well-documented PoC, not weaponized, and is intended for research and demonstration purposes.
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16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel page-cache side-channel vulnerability.
Linux kernel page-cache side-channel vulnerability.
Linux kernel page-cache side-channel vulnerability.
Linux kernel page-cache side-channel vulnerability.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.