CVE-2019-5023
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.
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opensrcsec grsecurity | 3.1-4.9.8-201702060653 ≤ v ≤ 3.1-4.9.24-201704252333, 4.9.25 ≤ v ≤ 4.9.74 | — |
| opensrcsec pax | pax-linux-4.9.8-test1 ≤ v ≤ pax-linux-4.9.8-test7 | — |
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Attack Surface Management
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