CVE-2009-3623

High

The lookup_cb_cred function in fs/nfsd/nfs4callback.c in the nfsd4 subsystem in the Linux kernel before 2.6.31.2 attempts to access a credentials cache even when a client specifies the AUTH_NULL authentication flavor, which allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an NFSv4 mount request.

Package Linux Kernel
Published 2009-10-30
Last modified 2026-04-23
CVSS version 2.0
Patch available
Awaiting data

CVSS 2.0 score

7.8

out of 10
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
User Interaction
Scope
Confidentiality
Low
Integrity
None
Availability
Vector string
AV:N/AC:L/Au:N/C:N/I:N/A:C

Weakness type

CWE-287

CVE-2009-3623 is classified as CWE-287

See CWE-287 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2009-3623 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Frequently asked questions

  • What is CVE-2009-3623?

    CVE-2009-3623 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2009-3623 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2009-3623?

    CVE-2009-3623 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 2.0). The vector string is AV:N/AC:L/Au:N/C:N/I:N/A:C .

  • Is there a patch available for CVE-2009-3623?

    No patch is currently available for CVE-2009-3623. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2009-3623 actively exploited?

    No — CVE-2009-3623 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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