An exploitable vulnerability exists in the grsecurity PaX patch for...

5.9 CVSS

Vulnerability Description

An exploitable vulnerability exists in the grsecurity PaX patch for the function read_kmem, in PaX from version pax-linux-4.9.8-test1 to 4.9.24-test7, grsecurity official from version grsecurity-3.1-4.9.8-201702060653 to grsecurity-3.1-4.9.24-201704252333, grsecurity unofficial from version v4.9.25-unofficialgrsec to v4.9.74-unofficialgrsec. PaX adds a temp buffer to the read_kmem function, which is never freed when an invalid address is supplied. This results in a memory leakage that can lead to a crash of the system. An attacker needs to induce a read to /dev/kmem using an invalid address to exploit this vulnerability.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784

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Affected Software

PaX

Vulnerable Versions:

PaX pax-linux-4.9.24-test7.patch (latest version available to the public) grsecurity grsecurity-3.1-4.9.24-201704252333.patch (latest official version available to the public) v4.9.74-unofficial_grsec (latest unofficial version available to the public)