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Vulnerability record · CVE-2022-43945 · published 4 November 2022

CVE-2022-43945: Linux kernel allocation without limits vulnerability

Linux · Linux Kernel

The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

7.5 CVSS 3.1 High EPSS 22% · top 2.4% CWE-131 · CWE-131CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/171289/Kernel-Live-Patch-Security-Notice-LNS-0092-1.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90497a16e434c2211c66e3de8e77b17868382b8 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221215-0006/ Third Party Advisory
http://packetstormsecurity.com/files/171289/Kernel-Live-Patch-Security-Notice-LNS-0092-1.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90497a16e434c2211c66e3de8e77b17868382b8 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221215-0006/ Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Track CVE-2022-43945 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2022-43945), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.