Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: reject undecryptable rxkad response tickets
rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded.
A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes.
Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.
Details
- Affected product:
- AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- kernel @ 2.6.32 (+18 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| Debian 11 | Released |
37 kernels
|
| Debian 11 cloud | Released |
17 kernels
|
| Debian 12 | Released |
40 kernels
|
| Debian 13 | Planned | — |
| Proxmox VE 7 5.15 | Released |
47 kernels
|
| Ubuntu 18.04 | Released |
125 kernels
|
| Ubuntu 18.04 AWS | Released |
67 kernels
|
| Ubuntu 18.04 AWS Focal | Released |
56 kernels
|
| Ubuntu 18.04 Azure | Released |
17 kernels
|
| Ubuntu 18.04 GCP | Planned | — |
| Ubuntu 18.04 HWE Focal | Released |
69 kernels
|
| Ubuntu 20.04 | Released |
127 kernels
|
| Ubuntu 20.04 AWS | Released |
109 kernels
|
| Ubuntu 20.04 Azure | Released |
100 kernels
|
| Ubuntu 20.04 HWE AWS | Released |
57 kernels
|
| Ubuntu 20.04 HWE Azure | Released |
40 kernels
|
| Ubuntu 22.04 | Released |
96 kernels
|
| Ubuntu 22.04 AWS | Released |
87 kernels
|
| Ubuntu 22.04 Azure | Released |
77 kernels
|
| Ubuntu 24.04 | Released |
45 kernels
|
| Ubuntu 24.04 AWS | Planned | — |