Riskcovery

CVE-2024-49974

NFSD: Limit the number of concurrent async COPY operations

State
Published
Severity
Not scored
Published
Oct 21, 2024
Updated
May 11, 2026
Reserved
Oct 21, 2024

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before 9e52ff544e0bfa09ee339fd7b0937ee3c080c24eAffected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before 43e46ee5efc03990b223f7aa8b77aa9c3d3acfdfAffected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before 7ea9260874b779637aff6d24c344b8ef4ac862a0Affected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before ae267989b7b7933dfedcd26468d0a88fc3a9da9eAffected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before b4e21431a0db4854b5023cd5af001be557e6c3dbAffected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before 6a488ad7745b8f64625c6d3a24ce7e448e83f11bAffected
  • e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to before aadc3bbea163b6caaaebfdd2b6c4667fbc726752Affected
LinuxLinux
  • 4.20Affected
  • before 4.20Not affected
  • 5.10.231 through 5.10.*Not affected
  • 5.15.174 through 5.15.*Not affected
  • 6.1.119 through 6.1.*Not affected
  • 6.6.63 through 6.6.*Not affected
  • 6.10.14 through 6.10.*Not affected
  • 6.11.3 through 6.11.*Not affected
  • 6.12 and laterNot affected

References

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