| Package | Affected versions | Patched versions |
|---|---|---|
| grsecurity | ≥ 3.1-4.9.8-201702060653, ≤ 3.1-4.9.24-201704252333≥ 4.9.25, ≤ 4.9.74 | |
| pax | ≥ pax-linux-4.9.8-test1, ≤ pax-linux-4.9.8-test7 |
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.
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