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.
The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.
| Link | Tags |
|---|---|
| https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784 | third party advisory exploit |