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

[Andrei Gherzan]

On 23/05/16 10:53AM, 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(-)
> 
> -- 
> 2.34.1

Acked-by: Andrei Gherzan <andrei.gherzan at canonical.com>

-- 
Andrei Gherzan
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