CVE-2022-48939

Summary

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

bpf: Add schedule points in batch ops

syzbot reported various soft lockups caused by bpf batch operations.

INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier

Nothing prevents batch ops to process huge amount of data, we need to add schedule points in them.

Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop.

This will be done later in -next tree once we get this fix merged, unless there is strong opinion doing this optimization sooner.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 < 7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12baffected
LinuxLinuxcb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 < 8628f489b749a4f9767991631921dbe3fbcdc784affected
LinuxLinuxcb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 < 7e8099967d0e3ff9d1ae043e80b27fbe46c08417affected
LinuxLinuxcb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 < 75134f16e7dd0007aa474b281935c5f42e79f2c8affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.103 <= 5.10.*unaffected
LinuxLinux5.15.26 <= 5.15.*unaffected
LinuxLinux5.16.12 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References