CVE-2024-35857

En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: icmp: evita posibles desreferencias a NULL por parte de icmp_build_probe(). El primer problema es una doble llamada a __in_dev_get_rcu(), porque la segunda podría devolver NULL. if (__in_dev_get_rcu(dev) && __in_dev_get_rcu(dev)->ifa_list) El segundo problema es una lectura de dev->ip6_ptr sin verificación NULL: if (!list_empty(&rcu_dereference(dev->ip6_ptr)->addr_list)) Use el correcto API de RCU para solucionarlos. v2: agregar falta incluir

A flaw was found in the Linux kernel's ICMP protocol. Under some conditions, a NULL pointer dereference can be triggered due to a missing check, causing a system crash and resulting in a denial of service.

In the Linux kernel, the following vulnerability has been resolved: icmp: prevent possible NULL dereferences from icmp_build_probe() First problem is a double call to __in_dev_get_rcu(), because the second one could return NULL. if (__in_dev_get_rcu(dev) && __in_dev_get_rcu(dev)->ifa_list) Second problem is a read from dev->ip6_ptr with no NULL check: if (!list_empty(&rcu_dereference(dev->ip6_ptr)->addr_list)) Use the correct RCU API to fix these. v2: add missing include <net/addrconf.h>

Benedict Schlüter, Supraja Sridhara, Andrin Bertschi, and Shweta Shinde discovered that an untrusted hypervisor could inject malicious #VC interrupts and compromise the security guarantees of AMD SEV-SNP. This flaw is known as WeSee. A local attacker in control of the hypervisor could use this to expose sensitive information or possibly execute arbitrary code in the trusted execution environment. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.