Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from kmaplocal not following last-in-first-out order, which could lead to a null pointer dereference...

CVE-2021-46910

A flaw was found in kmaplocal in the Linux Kernel that doubles the number of per-CPU fixmap slots allocated for kmaplocal. This causes the fixmap region to grow downwards beyond the start of its reserved window if the supported number of CPUs is large, eventually colliding with the newly added...

CVE-2021-46910

CVE-2021-46910 affects the Linux kernel ARM MM fixing path in kmap_local: when CONFIG_DEBUG_KMAP_LOCAL is enabled, per-CPU fixmap slots can grow and collide with the virtual DT mapping, potentially triggering an OOPS on systems with many CPUs. The disclosed remediation in the provided materials i...

CVE-2021-46910 ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled

In the Linux kernel, the following vulnerability has been resolved: ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUGKMAPLOCAL is enabled The debugging code for kmaplocal doubles the number of per-CPU fixmap slots allocated for kmaplocal, in order to use half of them as guard regions. This...