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

[Tim Gardner]

On 8/10/23 6:56 PM, 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: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc