[SRU Jammy,OEM-6.1,Lunar,Mantic 0/2] CVE-2023-5197

[Thadeu Lima de Souza Cascardo]

[Impact]
 A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables
 component can be exploited to achieve local privilege escalation. Addition
 and removal of rules from chain bindings within the same transaction causes
 leads to use-after-free.

[Backport]
Fix commit applies cleanly on Mantic. On Lunar, there is a missing
pre-requisite, which is already present in 5.15 and 6.1 kernels.

On those other kernels (6.2, 6.1 and 5.15), the fix requires a small
conflict fixup due to an extra unrelated hunk added on later kernels.

[Potential regression]
nftables users are affected.

Pablo Neira Ayuso (2):
  netfilter: nf_tables: skip bound chain in netns release path
  netfilter: nf_tables: disallow rule removal from chain binding

 net/netfilter/nf_tables_api.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

-- 
2.34.1