The fix for this bug has been awaiting testing feedback in the -proposed
repository for focal for more than 90 days.  Please test this fix and
update the bug appropriately with the results.  In the event that the
fix for this bug is still not verified 15 days from now, the package
will be removed from the -proposed repository.

** Tags added: removal-candidate

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https://bugs.launchpad.net/bugs/1956585

Title:
  OOB write on BPF_RINGBUF

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  tr3e wang discovered that an OOB write existed in the eBPF subsystem
  in the Linux kernel on BPF_RINGBUF.

  Mitigation commit: https://git.launchpad.net/~ubuntu-
  
kernel/ubuntu/+source/linux/+git/impish/commit/?id=53fb7741ff9d546174dbb585957b4f8b6afbdb83

  Mitigation:

  Disable unprivileged ebpf with:

    $ sudo sysctl kernel.unprivileged_bpf_disabled=1

  Unprivileged ebpf is disabled by default in Ubuntu 21.10 and newer.
  See https://www.kernel.org/doc/html/latest/admin-
  guide/sysctl/kernel.html#unprivileged-bpf-disabled for details on the
  configuration setting.

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