ACK: [SRU Focal/Jammy/HWE-5.19/OEM-6.0/OEM-6.1/Lunar 0/1] CVE-2023-1206

[Roxana Nicolescu]

On 11/08/2023 02:56, Cengiz Can wrote:
> [Impact]
> A hash collision flaw was found in the IPv6 connection lookup table in the
> Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood
> attack. A user located in the local network or with a high bandwidth connection
> can increase the CPU usage of the server that accepts IPV6 connections up to
> 95%.
>
> [Fix]
> Cherry picked from upstream to all kernels.
>
> [Test case]
> Compile and boot tested only.
>
> [Potential regression]
> IPv6 users can be affected, however highly unlikely since the fix only improves
> an inline hash calculation function.
>
> Stewart Smith (1):
>    tcp: Reduce chance of collisions in inet6_hashfn().
>
>   include/net/ipv6.h | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
>
Acked-by: Roxana Nicolescu <roxana.nicolescu at canonical.com>