Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
net: ipv6: clear suppressed fib6 rule result
fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info.
If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release().
Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.
Details
- Affected product:
- AlmaLinux 9.2 ESU , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , Debian 10 ELS , Debian 11 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU
- Affected packages:
- kernel @ 5.14.0 (+8 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| AlmaLinux 10 | In Rollout |
62 kernels
|
| AlmaLinux 8 | In Rollout |
129 kernels
|
| AlmaLinux 9 | Released |
127 kernels
|
| CentOS 8 | In Rollout |
33 kernels
|
| Debian 12 | Planned | — |
| Debian 13 | Released |
15 kernels
|
| Oracle Linux 10 | In Rollout |
48 kernels
|
| Oracle Linux 8 | In Rollout |
148 kernels
|
| Oracle Linux 9 | Released |
126 kernels
|
| Oracle Linux 9 UEK 7 | Planned | — |
| RHEL 10 | In Rollout |
62 kernels
|
| RHEL 8 | In Rollout |
145 kernels
|
| RHEL 9 | Released |
125 kernels
|
| Rocky Linux 10 | In Rollout |
45 kernels
|
| Rocky Linux 8 | In Rollout |
107 kernels
|
| Rocky Linux 9 | Released |
102 kernels
|