ACK: [SRU][Focal/Jammy/Lunar][PATCH 0/3] CVE-2023-4128

[Tim Gardner]

On 8/16/23 4:14 PM, Yuxuan Luo wrote:
> [Impact]
> A use-after-free flaw was found in net/sched/cls_fw.c in classifiers
> (cls_fw, cls_u32, and cls_route) in the Linux Kernel. This flaw allows a
> local attacker to perform a local privilege escalation due to incorrect
> handling of the existing filter, leading to a kernel information leak
> issue.
> 
> [Backport]
> Clean cherry picks.
> 
> [Test]
> Smoke tested by adding corresponding filters using `tc`.
> 
> [Potential Regression]
> Expect low regression potential.
> 
> valis (3):
>    net/sched: cls_u32: No longer copy tcf_result on update to avoid
>      use-after-free
>    net/sched: cls_fw: No longer copy tcf_result on update to avoid
>      use-after-free
>    net/sched: cls_route: No longer copy tcf_result on update to avoid
>      use-after-free
> 
>   net/sched/cls_fw.c    | 1 -
>   net/sched/cls_route.c | 1 -
>   net/sched/cls_u32.c   | 1 -
>   3 files changed, 3 deletions(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc