Vulnerability Details CVE-2019-5023
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.9%
CVSS Severity
CVSS v3 Score 5.9
CVSS v2 Score 4.3
References
Products affected by CVE-2019-5023
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cpe:2.3:a:opensrcsec:grsecurity:3.1-4.9.24-201704252333
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cpe:2.3:a:opensrcsec:grsecurity:3.1-4.9.8-201702060653
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cpe:2.3:a:opensrcsec:grsecurity:4.9.25
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cpe:2.3:a:opensrcsec:grsecurity:4.9.74
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cpe:2.3:a:opensrcsec:pax:pax-linux-4.9.8-test1
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cpe:2.3:a:opensrcsec:pax:pax-linux-4.9.8-test7