Bug 2313048 (CVE-2024-46717)

Summary: CVE-2024-46717 kernel: net/mlx5e: SHAMPO, Fix incorrect page release
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
under certain conditions-- no created skb, header_size == 0, and header_index + 1 % MLX5E_SHAMPO_WQ_HEADER_PER_PAGE == 0 -- a new skb is formed with no SHAMPO header, but a SHAMPO header page from header_index is released further down in the same function, leading to SHAMPO pages being released multiple times, which is incorrect.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2313078    
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Description OSIDB Bzimport 2024-09-18 07:21:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: SHAMPO, Fix incorrect page release

Under the following conditions:
1) No skb created yet
2) header_size == 0 (no SHAMPO header)
3) header_index + 1 % MLX5E_SHAMPO_WQ_HEADER_PER_PAGE == 0 (this is the
   last page fragment of a SHAMPO header page)

a new skb is formed with a page that is NOT a SHAMPO header page (it
is a regular data page). Further down in the same function
(mlx5e_handle_rx_cqe_mpwrq_shampo()), a SHAMPO header page from
header_index is released. This is wrong and it leads to SHAMPO header
pages being released more than once.
Comment 1 Michal Findra 2024-09-18 08:09:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091833-CVE-2024-46717-2f30@gregkh/T