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Fencer Vulns
high 7.8

CVE-2024-36020 json

i40e: fix vf may be used uninitialized in this function warning

published 2024-05-30 2 y ago modified 2026-10-15 25 d ago also EUVD-2024-35830

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

i40e: fix vf may be used uninitialized in this function warning

To fix the regression introduced by commit 52424f974bc5, which causes servers hang in very hard to reproduce conditions with resets races. Using two sources for the information is the root cause. In this function before the fix bumping v didn't mean bumping vf pointer. But the code used this variables interchangeably, so stale vf could point to different/not intended vf.

Remove redundant "v" variable and iterate via single VF pointer across whole function instead to guarantee VF pointer validity.

Patch / fix

  • Linux Linux 4.19.312, 5.4.274, 5.10.215, 5.15.154, 6.1, 6.1.85, 6.6.26, 6.8.5, 6.9
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1.1
  • linux Debian 12 6.1.85-1
  • linux Debian 14, Debian 13 6.8.9-1

debian advisories DEBIAN-CVE-2024-36020

  • linux Ubuntu 20.04 LTS 5.4.0-189.209
  • linux Ubuntu 22.04 LTS 5.15.0-116.126
  • linux Ubuntu 24.04 LTS 6.8.0-38.38
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1128.138
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1065.71
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1011.12
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1132.141
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1064.72

ubuntu advisories UBUNTU-CVE-2024-36020

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-rt RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.16.1.rt7.357.el8_10

red hat advisories RHSA-2024:5102RHSA-2024:5101RHSA-2024:5363RHSA-2024:5255RHSA-2024:5066RHSA-2024:5067

  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.1, Linux Micro 6.0 1-1.1
  • kernel-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source Linux Micro 6.0 6.4.0-18.1
  • kernel-default Linux Micro 6.0 6.4.0-18.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1

suse advisories SUSE-SU-2025:20166-1SUSE-SU-2025:20249-1SUSE-SU-2025:20028-1SUSE-SU-2025:20008-1SUSE-SU-2024:2973-1SUSE-SU-2024:2939-1

  • kernel AlmaLinux 9 5.14.0-427.31.1.el9_4
  • rv AlmaLinux 9 5.14.0-427.31.1.el9_4
  • perf AlmaLinux 9 5.14.0-427.31.1.el9_4
  • rtla AlmaLinux 9 5.14.0-427.31.1.el9_4
  • bpftool AlmaLinux 9 7.3.0-427.31.1.el9_4
  • libperf AlmaLinux 9 5.14.0-427.31.1.el9_4
  • kernel-rt AlmaLinux 9 5.14.0-427.31.1.el9_4
  • kernel-64k AlmaLinux 9 5.14.0-427.31.1.el9_4

almalinux advisories ALSA-2024:5363ALSA-2024:5101ALSA-2024:5102

  • kernel Rocky Linux 8 4.18.0-553.16.1.el8_10.cloud.0.1
  • kernel Rocky Linux 9 5.14.0-427.31.1.el9_4
  • kernel-rt Rocky Linux 8 4.18.0-553.16.1.rt7.357.el8_10
  • kernel Rocky Linux 8 4.18.0-553.16.1.el8_10

rocky linux advisories RXSA-2024:5101RLSA-2024:5363RLSA-2024:5102RLSA-2024:5101

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-2024-36020 updated cvss 5.3

kernel: i40e: fix vf may be used uninitialized in this function warning

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.67.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.67.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.67.1.el8_8
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5255
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.77.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.77.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.77.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.77.1.el9_2
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5066
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.31.1.el9_4, perf 5.14.0-427.31.1.el9_4, rtla 5.14.0-427.31.1.el9_4, kernel-devel-matched 5.14.0-427.31.1.el9_4, kernel-64k-devel-matched 5.14.0-427.31.1.el9_4, kernel-debug-devel-matched 5.14.0-427.31.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5363
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.77.1.el9_2, rtla 5.14.0-284.77.1.el9_2, kernel-devel-matched 5.14.0-284.77.1.el9_2, kernel-64k-devel-matched 5.14.0-284.77.1.el9_2, kernel-debug-devel-matched 5.14.0-284.77.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.77.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5066
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.16.1.el8_10, kernel 4.18.0-553.16.1.el8_10, bpftool 4.18.0-553.16.1.el8_10, kernel-core 4.18.0-553.16.1.el8_10, kernel-tools 4.18.0-553.16.1.el8_10, python3-perf 4.18.0-553.16.1.el8_10, +15 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5101
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.31.1.el9_4, kernel 5.14.0-427.31.1.el9_4, kernel-64k 5.14.0-427.31.1.el9_4, kernel-core 5.14.0-427.31.1.el9_4, kernel-tools 5.14.0-427.31.1.el9_4, python3-perf 5.14.0-427.31.1.el9_4, +28 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5363
show 12 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.113.1.el8_6, kernel 4.18.0-372.113.1.el8_6, bpftool 4.18.0-372.113.1.el8_6, kernel-core 4.18.0-372.113.1.el8_6, kernel-tools 4.18.0-372.113.1.el8_6, python3-perf 4.18.0-372.113.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.113.1.el8_6, kernel 4.18.0-372.113.1.el8_6, bpftool 4.18.0-372.113.1.el8_6, kernel-core 4.18.0-372.113.1.el8_6, kernel-tools 4.18.0-372.113.1.el8_6, python3-perf 4.18.0-372.113.1.el8_6, +15 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:4902
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.67.1.el8_8, kernel 4.18.0-477.67.1.el8_8, bpftool 4.18.0-477.67.1.el8_8, kernel-core 4.18.0-477.67.1.el8_8, kernel-tools 4.18.0-477.67.1.el8_8, python3-perf 4.18.0-477.67.1.el8_8, +15 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5255
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.77.1.el9_2, kernel 5.14.0-284.77.1.el9_2, kernel-64k 5.14.0-284.77.1.el9_2, kernel-core 5.14.0-284.77.1.el9_2, kernel-tools 5.14.0-284.77.1.el9_2, python3-perf 5.14.0-284.77.1.el9_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5066
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.113.1.el8_6, kernel 4.18.0-372.113.1.el8_6, bpftool 4.18.0-372.113.1.el8_6, kernel-core 4.18.0-372.113.1.el8_6, kernel-tools 4.18.0-372.113.1.el8_6, python3-perf 4.18.0-372.113.1.el8_6, +8 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:4902
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.16.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.16.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.16.1.el8_10
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5101
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.31.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5363
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-kvm 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-modules 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-kvm 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-core 4.18.0-553.16.1.rt7.357.el8_10, +4 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5102
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.31.1.el9_4, kernel-rt-kvm 5.14.0-427.31.1.el9_4, kernel-rt-core 5.14.0-427.31.1.el9_4, kernel-rt-modules 5.14.0-427.31.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.31.1.el9_4, kernel-rt-debug-core 5.14.0-427.31.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5363
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-core 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-modules 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-debug-core 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-modules-core 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-debug-modules 5.14.0-284.77.1.rt14.362.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-kvm 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-core 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-modules 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-debug-kvm 5.14.0-284.77.1.rt14.362.el9_2, kernel-rt-debug-core 5.14.0-284.77.1.rt14.362.el9_2, +6 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5067
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-modules 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-core 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-modules 4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-modules-extra 4.18.0-553.16.1.rt7.357.el8_10, +2 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5102
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.31.1.el9_4, kernel-rt-core 5.14.0-427.31.1.el9_4, kernel-rt-modules 5.14.0-427.31.1.el9_4, kernel-rt-debug-core 5.14.0-427.31.1.el9_4, kernel-rt-modules-core 5.14.0-427.31.1.el9_4, kernel-rt-debug-modules 5.14.0-427.31.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent the i40e module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to prevent it from loading automatically.” RHSA-2024:5363
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux AppStream (v. 9) kernel-headers 5.14.0-427.31.1.el9_4 Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.77.1.el9_2 Red Hat Enterprise Linux BaseOS EUS (v.8.8) kernel-headers 4.18.0-477.67.1.el8_8, kernel-cross-headers 4.18.0-477.67.1.el8_8 Red Hat Enterprise Linux CRB (v. 9) kernel-cross-headers 5.14.0-427.31.1.el9_4
    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 5.3

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
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

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

Classification

Weakness
  • CWE-908 Use of Uninitialized Resource
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.