Thanks for the additional information. By reading the pages Sergio
linked to I found one user writing:

  Downgrading openssh-server to version 8.0p1-19.el8_8 will
  revert the update and SSH will work again, although this
  probably not advisable.

That's definitely not advisable, but I think it's worth checking that
the older version actually works. This will help figuring out where the
problem is.

Then from https://linux.oracle.com/errata/ELSA-2024-12164.html I see
that newer openssh versions are available. Those are quite recent
(2024-02-14). Could you please test those and report your findings?

Thanks!

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to openssh in Ubuntu.
https://bugs.launchpad.net/bugs/2052482

Title:
  Bad packet length 2424479189 Connection corrupted

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  ssh-clent:
  uname -a :5.15.0-48-generic #54-Ubuntu
  ```
  Ubuntu 22.04.3 LTS
  OpenSSH_8.9p1 Ubuntu-3ubuntu0.6, OpenSSL 3.0.2 15 Mar 2022
  ```

  ssh-server:
  ```
  OracleLinux 8.9
  OpenSSH_8.0p1, OpenSSL 1.1.1k  FIPS 25 Mar 2021
  ```

  ```
  userxxx@userxxx-H3C-X7-030s-0274:~$ ssh 192.168.xxx.xxx -vvv
  OpenSSH_8.9p1 Ubuntu-3ubuntu0.6, OpenSSL 3.0.2 15 Mar 2022
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf 
matched no files
  debug1: /etc/ssh/ssh_config line 21: Applying options for *
  debug2: resolve_canonicalize: hostname 192.168.xxx.xxx is address
  debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> 
'/home/userxxx/.ssh/known_hosts'
  debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> 
'/home/userxxx/.ssh/known_hosts2'
  debug3: ssh_connect_direct: entering
  debug1: Connecting to 192.168.xxx.xxx [192.168.xxx.xxx] port 22.
  debug3: set_sock_tos: set socket 3 IP_TOS 0x10
  debug1: Connection established.
  debug1: identity file /home/userxxx/.ssh/id_rsa type 0
  debug1: identity file /home/userxxx/.ssh/id_rsa-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_ecdsa type 2
  debug1: identity file /home/userxxx/.ssh/id_ecdsa-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_ecdsa_sk type -1
  debug1: identity file /home/userxxx/.ssh/id_ecdsa_sk-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_ed25519 type -1
  debug1: identity file /home/userxxx/.ssh/id_ed25519-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_ed25519_sk type -1
  debug1: identity file /home/userxxx/.ssh/id_ed25519_sk-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_xmss type -1
  debug1: identity file /home/userxxx/.ssh/id_xmss-cert type -1
  debug1: identity file /home/userxxx/.ssh/id_dsa type -1
  debug1: identity file /home/userxxx/.ssh/id_dsa-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.6
  debug1: Remote protocol version 2.0, remote software version OpenSSH_8.0
  debug1: compat_banner: match: OpenSSH_8.0 pat OpenSSH* compat 0x04000000
  debug2: fd 3 setting O_NONBLOCK
  debug1: Authenticating to 192.168.xxx.xxx:22 as 'userxxx'
  debug3: record_hostkey: found key type ED25519 in file 
/home/userxxx/.ssh/known_hosts:20
  debug3: load_hostkeys_file: loaded 1 keys from 192.168.xxx.xxx
  debug1: load_hostkeys: fopen /home/userxxx/.ssh/known_hosts2: No such file or 
directory
  debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or 
directory
  debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or 
directory
  debug3: order_hostkeyalgs: have matching best-preference key type 
ssh-ed25519-cert-...@openssh.com, using HostkeyAlgorithms verbatim
  debug3: send packet: type 20
  debug1: SSH2_MSG_KEXINIT sent
  debug3: receive packet: type 20
  debug1: SSH2_MSG_KEXINIT received
  debug2: local client KEXINIT proposal
  debug2: KEX algorithms: 
curve25519-sha256,curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha...@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c,kex-strict-c-...@openssh.com
  debug2: host key algorithms: 
ssh-ed25519-cert-...@openssh.com,ecdsa-sha2-nistp256-cert-...@openssh.com,ecdsa-sha2-nistp384-cert-...@openssh.com,ecdsa-sha2-nistp521-cert-...@openssh.com,sk-ssh-ed25519-cert-...@openssh.com,sk-ecdsa-sha2-nistp256-cert-...@openssh.com,rsa-sha2-512-cert-...@openssh.com,rsa-sha2-256-cert-...@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25...@openssh.com,sk-ecdsa-sha2-nistp...@openssh.com,rsa-sha2-512,rsa-sha2-256
  debug2: ciphers ctos: 
chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com
  debug2: ciphers stoc: 
chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com
  debug2: MACs ctos: 
umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: MACs stoc: 
umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: compression ctos: none,z...@openssh.com,zlib
  debug2: compression stoc: none,z...@openssh.com,zlib
  debug2: languages ctos:
  debug2: languages stoc:
  debug2: first_kex_follows 0
  debug2: reserved 0
  debug2: peer server KEXINIT proposal
  debug2: KEX algorithms: 
curve25519-sha256,curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
  debug2: host key algorithms: 
rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
  debug2: ciphers ctos: 
aes256-...@openssh.com,chacha20-poly1...@openssh.com,aes256-ctr,aes256-cbc,aes128-...@openssh.com,aes128-ctr,aes128-cbc
  debug2: ciphers stoc: 
aes256-...@openssh.com,chacha20-poly1...@openssh.com,aes256-ctr,aes256-cbc,aes128-...@openssh.com,aes128-ctr,aes128-cbc
  debug2: MACs ctos: 
hmac-sha2-256-...@openssh.com,hmac-sha1-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha2-256,hmac-sha1,umac-...@openssh.com,hmac-sha2-512
  debug2: MACs stoc: 
hmac-sha2-256-...@openssh.com,hmac-sha1-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha2-256,hmac-sha1,umac-...@openssh.com,hmac-sha2-512
  debug2: compression ctos: none,z...@openssh.com
  debug2: compression stoc: none,z...@openssh.com
  debug2: languages ctos:
  debug2: languages stoc:
  debug2: first_kex_follows 0
  debug2: reserved 0
  debug1: kex: algorithm: curve25519-sha256
  debug1: kex: host key algorithm: ssh-ed25519
  debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC: 
<implicit> compression: none
  debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC: 
<implicit> compression: none
  debug3: send packet: type 30
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
  debug3: receive packet: type 31
  debug1: SSH2_MSG_KEX_ECDH_REPLY received
  debug1: Server host key: ssh-ed25519 
SHA256:RmBQWHDJL5Q02oxK/CmfUYLcFMhGdaR888EUDlenLlY
  debug3: record_hostkey: found key type ED25519 in file 
/home/userxxx/.ssh/known_hosts:20
  debug3: load_hostkeys_file: loaded 1 keys from 192.168.xxx.xxx
  debug1: load_hostkeys: fopen /home/userxxx/.ssh/known_hosts2: No such file or 
directory
  debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or 
directory
  debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or 
directory
  debug1: Host '192.168.xxx.xxx' is known and matches the ED25519 host key.
  debug1: Found key in /home/userxxx/.ssh/known_hosts:20
  debug3: send packet: type 21
  debug2: ssh_set_newkeys: mode 1
  debug1: rekey out after 134217728 blocks
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug3: receive packet: type 21
  debug1: SSH2_MSG_NEWKEYS received
  debug2: ssh_set_newkeys: mode 0
  debug1: rekey in after 134217728 blocks
  debug1: get_agent_identities: bound agent to hostkey
  debug1: get_agent_identities: agent returned 2 keys
  debug1: Will attempt key: /home/userxxx/.ssh/id_rsa RSA 
SHA256:8/LUiKki9kVQBQgKvBlVs67wsC834tokLw04csky8d4 agent
  debug1: Will attempt key: /home/userxxx/.ssh/id_ecdsa ECDSA 
SHA256:wfU6LbhyFJZ4EE5af/vaBMBxRo/xOf2DrVLKZJxGCqQ agent
  debug1: Will attempt key: /home/userxxx/.ssh/id_ecdsa_sk
  debug1: Will attempt key: /home/userxxx/.ssh/id_ed25519
  debug1: Will attempt key: /home/userxxx/.ssh/id_ed25519_sk
  debug1: Will attempt key: /home/userxxx/.ssh/id_xmss
  debug1: Will attempt key: /home/userxxx/.ssh/id_dsa
  debug2: pubkey_prepare: done
  debug3: send packet: type 5
  Bad packet length 2424479189.
  debug2: sshpkt_disconnect: sending SSH2_MSG_DISCONNECT: Packet corrupt
  debug3: send packet: type 1
  ssh_dispatch_run_fatal: Connection to 192.168.xxx.xxx port 22: Connection 
corrupted
  ```

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