# CVE-2023-1652: Linux Kernel use-after-free in NFS nfsd4_ssc_setup_dul

Source: https://junglewise.ai/threats/cve-2023-1652-linux-kernel-use-after-free-in-nfs-nfsd4-ssc-setup-dul  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-03-29. Updated: 2026-05-12  
License: CC BY 4.0 with a link back

CVE-2023-1652 · Severity: high · CVSS 7.1 · Published 2023-03-29

A security vulnerability has been identified in the Linux Kernel's Network File System (NFS) component, which is used for sharing files across a network. A local attacker with system access could exploit this flaw to cause a complete system crash or potentially access sensitive information stored in the system's memory. This could lead to service disruptions or the exposure of confidential data.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel), [Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem](https://junglewise.ai/threats/technologies/simatic-s7-1500-tm-mfp-gnu-linux-subsystem). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux), [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2023-1652 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-1652 being exploited in the wild.

**How severe is CVE-2023-1652?** High severity, with a CVSS score of 7.1, published 29 March 2023.

**Which products and versions are affected?** Linux Kernel versions up to (excluding) 6.2; 5.14 to 5.15.91; 5.16 to 6.1.9; Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem All versions.

**Is there a fix for CVE-2023-1652?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2023-1652 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2023-1652?** Check whether you run Linux Kernel or Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A use-after-free (UAF) vulnerability exists in the nfsd4_ssc_setup_dul function within fs/nfsd/nfs4proc.c of the Linux Kernel's NFS server implementation. The flaw occurs during the setup of server-side copy (SSC) operations. A local attacker with low privileges can trigger this condition to cause a kernel panic (denial of service) or read sensitive kernel memory (information disclosure). The issue affects various kernel versions including branches 5.14.x, 5.16.x, and 6.1.x, and was addressed in version 6.2. Patches are available through major Linux distributions and upstream kernel updates.

## Affected products

- Linux Linux Kernel versions up to (excluding) 6.2; 5.14 to 5.15.91; 5.16 to 6.1.9
- Red Hat Enterprise Linux 9.0
- Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem All versions

## Timeline

- 2023-03-29: disclosed: Initial NVD publication
- 2023-03-29: advisory: Red Hat advisory published
- 2024-04-09: advisory: Siemens advisory published for SIMATIC S7-1500

## References

- [https://access.redhat.com/security/cve/cve-2023-1652](https://access.redhat.com/security/cve/cve-2023-1652)
- [https://security.netapp.com/advisory/ntap-20230511-0006/](https://security.netapp.com/advisory/ntap-20230511-0006/)
- [https://cert-portal.siemens.com/productcert/html/ssa-265688.html](https://cert-portal.siemens.com/productcert/html/ssa-265688.html)

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