Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
net: caif: clear client service pointer on teardown
caif_connect() can tear down an existing client after remote shutdown by
calling caif_disconnect_client() followed by caif_free_client().
caif_free_client() releases the service layer referenced by
adap_layer->dn, but leaves that pointer stale.
When the socket is later destroyed, caif_sock_destructor() calls
caif_free_client() again and dereferences the freed service pointer.
Clear the client/service links before releasing the service object so repeated teardown becomes harmless.
Details
- Affected product:
- AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 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 @ 5.10.0 (+16 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| Debian 11 | Planned | — |
| Debian 11 cloud | Planned | — |
| Debian 12 | Planned | — |
| Debian 13 | Will Not Fix |
6 kernels
|
| Ubuntu 22.04 | Planned | — |
| Ubuntu 24.04 | Planned | — |