Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
tunnels: fix out of bounds access when building IPv6 PMTU error
If the ICMPv6 error is built from a non-linear skb we get the following splat,
BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 … kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0
Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.
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 6 ELS , CloudLinux 7 ELS , Debian 10 ELS , Oracle Linux 6 ELS , TuxCare 9.6 ESU
- Affected packages:
- kernel @ 2.6.32 (+11 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| AlmaLinux 8 | Released |
42 kernels
|
| Amazon Linux 2023 | Will Not Fix | — |
| Amazon Linux 2 5.10 | Will Not Fix | — |
| CentOS 8 | Released |
13 kernels
|
| CloudLinux OS 7h | Released |
53 kernels
|
| CloudLinux OS 8 | Released |
51 kernels
|
| Debian 11 | Released |
28 kernels
|
| Debian 11 cloud | Released |
8 kernels
|
| Debian 12 | Planned | — |
| Oracle Linux 8 | Released |
46 kernels
|
| Proxmox VE 7 5.15 | Released |
43 kernels
|
| RHEL 8 | Released |
42 kernels
|
| Rocky Linux 8 | Released |
38 kernels
|
| Ubuntu 20.04 HWE AWS | Released |
37 kernels
|
| Ubuntu 20.04 HWE Azure | Released |
21 kernels
|
| Ubuntu 22.04 | Released |
50 kernels
|
| Ubuntu 22.04 AWS | Released |
44 kernels
|
| Ubuntu 22.04 Azure | Released |
41 kernels
|