Bug 2334395 (CVE-2024-53236)

Summary: CVE-2024-53236 kernel: xsk: Free skb when TX metadata options are invalid
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2024-12-27 14:04:10 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xsk: Free skb when TX metadata options are invalid

When a new skb is allocated for transmitting an xsk descriptor, i.e., for
every non-multibuf descriptor or the first frag of a multibuf descriptor,
but the descriptor is later found to have invalid options set for the TX
metadata, the new skb is never freed. This can leak skbs until the send
buffer is full which makes sending more packets impossible.

Fix this by freeing the skb in the error path if we are currently dealing
with the first frag, i.e., an skb allocated in this iteration of
xsk_build_skb.
Comment 1 Avinash Hanwate 2024-12-29 08:17:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122738-CVE-2024-53236-0ab4@gregkh/T