Ubuntu: (Multiple Advisories) (CVE-2024-43870): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: perf: Fix event leak upon exit When a task is scheduled out, pending sigtrap deliveries are deferred to the target task upon resume to userspace via task_work. However failures while adding an event's callback to the task_work engine are ignored. And since the last call for events exit happen after task work is eventually closed, there is a small window during which pending sigtrap can be queued though ignored, leaking the event refcount addition such as in the following scenario: TASK A ----- do_exit() exit_task_work(tsk); <IRQ> perf_event_overflow() event->pending_sigtrap = pending_id; irq_work_queue(&event->pending_irq); </IRQ> =========> PREEMPTION: TASK A -> TASK B event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount) // FAILS: task work has exited task_work_add(&event->pending_task) [...] <IRQ WORK> perf_pending_irq() // early return: event->oncpu = -1 </IRQ WORK> [...] =========> TASK B -> TASK A perf_event_exit_task(tsk) perf_event_exit_event() free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // leak event due to unexpected refcount == 2 As a result the event is never released while the task exits. Fix this with appropriate task_work_add()'s error handling.
Solution(s)
- ubuntu-upgrade-linux-image-5-15-0-1038-xilinx-zynqmp
- ubuntu-upgrade-linux-image-5-15-0-1055-gkeop
- ubuntu-upgrade-linux-image-5-15-0-1065-ibm
- ubuntu-upgrade-linux-image-5-15-0-1065-raspi
- ubuntu-upgrade-linux-image-5-15-0-1067-nvidia
- ubuntu-upgrade-linux-image-5-15-0-1067-nvidia-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-1069-gke
- ubuntu-upgrade-linux-image-5-15-0-1069-kvm
- ubuntu-upgrade-linux-image-5-15-0-1070-oracle
- ubuntu-upgrade-linux-image-5-15-0-1071-gcp
- ubuntu-upgrade-linux-image-5-15-0-1072-aws
- ubuntu-upgrade-linux-image-5-15-0-1075-azure
- ubuntu-upgrade-linux-image-5-15-0-125-generic
- ubuntu-upgrade-linux-image-5-15-0-125-generic-64k
- ubuntu-upgrade-linux-image-5-15-0-125-generic-lpae
- ubuntu-upgrade-linux-image-5-15-0-125-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-125-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-aws-lts-22-04
- ubuntu-upgrade-linux-image-azure-lts-22-04
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-gcp-lts-22-04
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
- ubuntu-upgrade-linux-image-generic-hwe-20-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-gke-5-15
- ubuntu-upgrade-linux-image-gkeop
- ubuntu-upgrade-linux-image-gkeop-5-15
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-oem-20-04
- ubuntu-upgrade-linux-image-oem-20-04b
- ubuntu-upgrade-linux-image-oem-20-04c
- ubuntu-upgrade-linux-image-oem-20-04d
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-lts-22-04
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-raspi-nolpae
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-20-04
- ubuntu-upgrade-linux-image-xilinx-zynqmp
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