Bug 2320271 (CVE-2024-47708)

Summary: CVE-2024-47708 kernel: netkit: Assign missing bpf_net_context
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2320343    
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Description OSIDB Bzimport 2024-10-21 13:07:12 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netkit: Assign missing bpf_net_context

During the introduction of struct bpf_net_context handling for
XDP-redirect, the netkit driver has been missed, which also requires it
because NETKIT_REDIRECT invokes skb_do_redirect() which is accessing the
per-CPU variables. Otherwise we see the following crash:

	BUG: kernel NULL pointer dereference, address: 0000000000000038
	bpf_redirect()
	netkit_xmit()
	dev_hard_start_xmit()

Set the bpf_net_context before invoking netkit_xmit() program within the
netkit driver.
Comment 1 Robb Gatica 2024-10-21 15:05:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102117-CVE-2024-47708-2b8f@gregkh/T