CVE-2020-16119

Una vulnerabilidad de uso de la memoria previamente liberada en el kernel de Linux explotable por un atacante local debido a la reutilización de un socket DCCP con un objeto dccps_hc_tx_ccid adjunto como oyente después de ser liberado. Corregido en el kernel de Ubuntu Linux versiones 5.4.0-51.56, 5.3.0-68.63, 4.15.0-121.123, 4.4.0-193.224, 3.13.0.182.191 y 3.2.0-149.196

Hador Manor discovered that the DCCP protocol implementation in the Linux kernel improperly handled socket reuse, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Giuseppe Scrivano discovered that the overlay file system in the Linux kernel did not properly perform permission checks in some situations. A local attacker could possibly use this to bypass intended restrictions and gain read access to restricted files. Various other issues were also addressed.