CVE-2019-5023
31.10.2019, 21:15
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.Enginsight
| Vendor | Product | Version |
|---|---|---|
| opensrcsec | grsecurity | 3.1-4.9.8-201702060653 ≤ 𝑥 ≤ 3.1-4.9.24-201704252333 |
| opensrcsec | grsecurity | 4.9.25 ≤ 𝑥 ≤ 4.9.74 |
𝑥
= Vulnerable software versions
Common Weakness Enumeration
- CWE-401 - Missing Release of Memory after Effective LifetimeThe software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.
- CWE-772 - Missing Release of Resource after Effective LifetimeThe software does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.