[SRU Bionic 0/5] CVE-2023-32233

[Stefan Bader]

On 16.05.23 15:53, Thadeu Lima de Souza Cascardo wrote:
> [Impact]
> On systems where user namespaces can be created by unprivileged users,
> which is the default configuration on Ubuntu, unprivileged users can
> trigger a use-after-free vulnerability on netfilter. This could be used to
> crash the system or elevate privileges.
> 
> [Test case]
> A reproducer that causes an oops under slub_debug=FZP was tested and the fix
> has been shown to prevent it.
> 
> [Backport]
> Picked patches submitted by the maintainer to 4.14 tree.
> 
> [Potential impact]
> netfilter users may find regressions when manipulating nftables.
> 
> Florian Westphal (1):
>    netfilter: nf_tables: split set destruction in deactivate and destroy
>      phase
> 
> Pablo Neira Ayuso (4):
>    netfilter: nf_tables: unbind set in rule from commit path
>    netfilter: nf_tables: use-after-free in failing rule with bound set
>    netfilter: nf_tables: bogus EBUSY when deleting set after flush
>    netfilter: nf_tables: deactivate anonymous set from preparation phase
> 
>   include/net/netfilter/nf_tables.h |  30 ++++++-
>   net/netfilter/nf_tables_api.c     | 139 +++++++++++++++++++++---------
>   net/netfilter/nft_dynset.c        |  22 ++++-
>   net/netfilter/nft_immediate.c     |   6 +-
>   net/netfilter/nft_lookup.c        |  21 ++++-
>   net/netfilter/nft_objref.c        |  21 ++++-
>   6 files changed, 193 insertions(+), 46 deletions(-)
> 

All patches seem to miss the cherry pick/backport line. As we probably 
also should start handling bionic like ESM, maybe this should be 
re-submitted with fixed provenance to the ESM list. Not NACKing straight 
to leave the option for alternatives.
-- 
- Stefan

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