Bug 2320559 (CVE-2024-49974)

Summary: CVE-2024-49974 kernel: NFSD: Limit the number of concurrent async COPY operations
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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Bug Depends On: 2321031    
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Description OSIDB Bzimport 2024-10-21 19:10:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

NFSD: Limit the number of concurrent async COPY operations

Nothing appears to limit the number of concurrent async COPY
operations that clients can start. In addition, AFAICT each async
COPY can copy an unlimited number of 4MB chunks, so can run for a
long time. Thus IMO async COPY can become a DoS vector.

Add a restriction mechanism that bounds the number of concurrent
background COPY operations. Start simple and try to be fair -- this
patch implements a per-namespace limit.

An async COPY request that occurs while this limit is exceeded gets
NFS4ERR_DELAY. The requesting client can choose to send the request
again after a delay or fall back to a traditional read/write style
copy.

If there is need to make the mechanism more sophisticated, we can
visit that in future patches.
Comment 1 Robb Gatica 2024-10-22 16:28:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102134-CVE-2024-49974-bda6@gregkh/T
Comment 2 Avinash Hanwate 2024-10-23 04:15:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102134-CVE-2024-49974-bda6@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:30:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966