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Fencer Vulns
high 7.5

CVE-2022-43945 json

The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow.

published 2022-11-04 4 y ago modified 2026-10-14 25 d ago also EUVD-2022-46915

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.5%
EPSS 5.5% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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

Patch / fix

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1.1
  • linux Debian 14, Debian 13, Debian 12 6.0.3-1

debian advisories DEBIAN-CVE-2022-43945

  • linux Ubuntu 18.04 LTS 4.15.0-202.213
  • linux Ubuntu 20.04 LTS 5.4.0-137.154
  • linux Ubuntu 22.04 LTS 5.15.0-56.62
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1148.160
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1094.102
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1026.30
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1098.107
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1025.32

ubuntu advisories UBUNTU-CVE-2022-43945

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-162.12.1.el9_1
  • perf RHEL 9 5.14.0-162.12.1.el9_1
  • bpftool RHEL 9 5.14.0-162.12.1.el9_1
  • kernel-core RHEL 9 5.14.0-162.12.1.el9_1
  • kernel-tools RHEL 9 5.14.0-162.12.1.el9_1
  • python3-perf RHEL 9 5.14.0-162.12.1.el9_1
  • kernel-modules RHEL 9 5.14.0-162.12.1.el9_1
  • kernel-zfcpdump RHEL 9 5.14.0-162.12.1.el9_1

red hat advisories RHSA-2023:0334RHSA-2023:0300RHSA-2023:0348RHSA-2022:9082RHSA-2022:8973RHSA-2022:8974

  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.127.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.127.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.127.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.127.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.127.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.127.1.150500.6.61.1
  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.226.2
  • kernel-syms SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.226.1

suse advisories SUSE-SU-2025:4320-1SUSE-SU-2025:4189-1SUSE-SU-2025:4188-1SUSE-SU-2025:4149-1SUSE-SU-2025:4139-1SUSE-SU-2025:4135-1

  • kernel AlmaLinux 8 4.18.0-425.13.1.el8_7
  • perf AlmaLinux 8 4.18.0-425.13.1.el8_7
  • bpftool AlmaLinux 8 4.18.0-425.13.1.el8_7
  • kernel-core AlmaLinux 8 4.18.0-425.13.1.el8_7
  • kernel-tools AlmaLinux 8 4.18.0-425.13.1.el8_7
  • python3-perf AlmaLinux 8 4.18.0-425.13.1.el8_7
  • kernel-modules AlmaLinux 8 4.18.0-425.13.1.el8_7
  • kernel-zfcpdump AlmaLinux 8 4.18.0-425.13.1.el8_7

almalinux advisories ALSA-2023:0832ALSA-2023:0854ALSA-2023:0300ALSA-2023:0334

  • kernel Rocky Linux 8 4.18.0-425.13.1.el8_7.cloud
  • kernel-rt Rocky Linux 8 4.18.0-425.13.1.rt7.223.el8_7
  • kernel Rocky Linux 8 4.18.0-425.13.1.el8_7
  • kernel Rocky Linux 9 5.14.0-162.12.1.el9_1.0.2
  • kernel Rocky Linux 9 5.14.0-162.12.1.el9_1.cloud.0.1
  • kernel-rt Rocky Linux 9 5.14.0-162.12.1.rt21.175.el9_1

rocky linux advisories RXSA-2023:0832RLSA-2023:0854RLSA-2023:0832RLSA-2023:0334RXSA-2023:0334RLSA-2023:0300

  • kernel CBL-Mariner 2.0 5.15.82.1-1

azure linux advisories AZL-11379

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • linux-lts Arch Linux 6.2-1
  • linux-hardened Arch Linux 6.2-1
  • linux-zen Arch Linux 6.2-1
  • linux Arch Linux 6.2-1

arch linux advisories AVG-2834AVG-2835AVG-2836AVG-2837

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-43945 updated cvss 7.5

kernel: nfsd buffer overflow by RPC message over TCP with garbage data

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-425.13.1.el8_7, kernel-debuginfo-common-aarch64 4.18.0-425.13.1.el8_7, kernel-debuginfo-common-ppc64le 4.18.0-425.13.1.el8_7
    fixed: vendor fix RHSA-2023:0832
  • Red Hat CodeReady Linux Builder (v. 9) kernel-debuginfo-common-s390x 5.14.0-162.12.1.el9_1, kernel-debuginfo-common-x86_64 5.14.0-162.12.1.el9_1, kernel-debuginfo-common-aarch64 5.14.0-162.12.1.el9_1, kernel-debuginfo-common-ppc64le 5.14.0-162.12.1.el9_1
    fixed: vendor fix RHSA-2023:0334
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.36.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.36.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.36.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.36.1.el9_0
    fixed: vendor fix RHSA-2022:8973
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-162.12.1.el9_1, kernel-devel-matched 5.14.0-162.12.1.el9_1, kernel-debug-devel-matched 5.14.0-162.12.1.el9_1, kernel-debuginfo-common-s390x 5.14.0-162.12.1.el9_1, kernel-zfcpdump-devel-matched 5.14.0-162.12.1.el9_1, kernel-debuginfo-common-x86_64 5.14.0-162.12.1.el9_1, +2 more
    fixed: vendor fix RHSA-2023:0334
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.36.1.el9_0, kernel-devel-matched 5.14.0-70.36.1.el9_0, kernel-debug-devel-matched 5.14.0-70.36.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.36.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.36.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.36.1.el9_0, +2 more
    fixed: vendor fix RHSA-2022:8973
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-425.13.1.el8_7, kernel 4.18.0-425.13.1.el8_7, bpftool 4.18.0-425.13.1.el8_7, kernel-core 4.18.0-425.13.1.el8_7, kernel-tools 4.18.0-425.13.1.el8_7, python3-perf 4.18.0-425.13.1.el8_7, +17 more
    fixed: vendor fix RHSA-2023:0832
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-162.12.1.el9_1, bpftool 5.14.0-162.12.1.el9_1, kernel-core 5.14.0-162.12.1.el9_1, kernel-tools 5.14.0-162.12.1.el9_1, python3-perf 5.14.0-162.12.1.el9_1, kernel-modules 5.14.0-162.12.1.el9_1, +15 more
    fixed: vendor fix RHSA-2023:0334
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.36.1.el9_0, bpftool 5.14.0-70.36.1.el9_0, kernel-core 5.14.0-70.36.1.el9_0, kernel-tools 5.14.0-70.36.1.el9_0, python3-perf 5.14.0-70.36.1.el9_0, kernel-modules 5.14.0-70.36.1.el9_0, +19 more
    fixed: vendor fix RHSA-2022:8973
show 7 more
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-core 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-modules 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-debug-core 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-debug-modules 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-modules-extra 4.18.0-425.13.1.rt7.223.el8_7, +2 more
    fixed: vendor fix RHSA-2023:0854
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-core 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-modules 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-debug-core 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-debug-modules 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-modules-extra 5.14.0-162.12.1.rt21.175.el9_1, +2 more
    fixed: vendor fix RHSA-2023:0300
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-core 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-modules 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-debug-core 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-debug-modules 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-modules-extra 5.14.0-70.36.1.rt21.108.el9_0, +2 more
    fixed: vendor fix RHSA-2022:8974
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-kvm 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-core 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-modules 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-debug-kvm 4.18.0-425.13.1.rt7.223.el8_7, kernel-rt-debug-core 4.18.0-425.13.1.rt7.223.el8_7, +4 more
    fixed: vendor fix RHSA-2023:0854
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-kvm 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-core 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-modules 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-debug-kvm 5.14.0-162.12.1.rt21.175.el9_1, kernel-rt-debug-core 5.14.0-162.12.1.rt21.175.el9_1, +4 more
    fixed: vendor fix RHSA-2023:0300
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-kvm 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-core 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-modules 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-debug-kvm 5.14.0-70.36.1.rt21.108.el9_0, kernel-rt-debug-core 5.14.0-70.36.1.rt21.108.el9_0, +4 more
    fixed: vendor fix RHSA-2022:8974
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-102-01 updated cvss 6.5

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

5.46% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • linux linux_kernel
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Classification

Weakness
  • CWE-131 Incorrect Calculation of Buffer Size
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.