CVE-2022-48714

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Use VM_MAP instead of VM_ALLOC for ringbuf

After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping"), non-VM_ALLOC mappings will be marked as accessible in __get_vm_area_node() when KASAN is enabled. But now the flag for ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access after vmap() returns. Because the ringbuf area is created by mapping allocated pages, so use VM_MAP instead.

After the change, info in /proc/vmallocinfo also changes from [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user to [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user

Affected Software

VendorProductVersion RangeStatus
LinuxLinux457f44363a8894135c85b7a9afd2bd8196db24ab < 6304a613a97d6dcd49b93fbad31e9f39d1e138d6affected
LinuxLinux457f44363a8894135c85b7a9afd2bd8196db24ab < 5e457aeab52a5947619e1f18047f4d2f3212b3ebaffected
LinuxLinux457f44363a8894135c85b7a9afd2bd8196db24ab < d578933f6226d5419af9306746efa1c693cbaf9caffected
LinuxLinux457f44363a8894135c85b7a9afd2bd8196db24ab < b293dcc473d22a62dc6d78de2b15e4f49515db56affected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.99 <= 5.10.*unaffected
LinuxLinux5.15.22 <= 5.15.*unaffected
LinuxLinux5.16.8 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References