CVE-2026-43418

A flaw was found in the Linux kernel's sched/mmcid component. When new tasks are created concurrently, a race condition can occur where a task is accounted as a Memory Management Context ID MMCID user before it is fully registered in the system's task lists. This can lead to an incorrect allocati...

sched/mmcid: Don't assume CID is CPU owned on mode switch

...

UBUNTU-CVE-2026-23225

In the Linux kernel, the following vulnerability has been resolved: sched/mmcid: Don't assume CID is CPU owned on mode switch Shinichiro reported a KASAN UAF, which is actually an out of bounds access in the MMCID management code. CPU0 CPU1 T1 runs in userspace T0: forkT4 - Switch to per CPU CID...

ALPINE-CVE-2019-17346

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges because of an incompatibility between Process Context Identifiers PCID and TLB flushes...