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Fencer Vulns
medium 5.5

CVE-2024-26993 json

fs: sysfs: Fix reference leak in sysfs_break_active_protection()

published 2024-05-01 2 y ago modified 2026-10-15 25 d ago also EUVD-2024-24255

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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

fs: sysfs: Fix reference leak in sysfs_break_active_protection()

The sysfs_break_active_protection() routine has an obvious reference leak in its error path. If the call to kernfs_find_and_get() fails then kn will be NULL, so the companion sysfs_unbreak_active_protection() routine won't get called (and would only cause an access violation by trying to dereference kn->parent if it was called). As a result, the reference to kobj acquired at the start of the function will never be released.

Fix the leak by adding an explicit kobject_put() call when kn is NULL.

Patch / fix

  • Linux Linux 3.17, 3.19, 4.5, 4.10, 4.15, 4.19, 4.19.313, 5.4.275, 5.10.216, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 6.9
  • Siemens RUGGEDCOM RST2428P V3.1
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family V3.1
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1.1
  • linux Debian 12 6.1.90-1
  • linux Debian 14, Debian 13 6.8.9-1

debian advisories DEBIAN-CVE-2024-26993

  • 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-2024-26993

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 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.5.1.rt7.346.el8_10

red hat advisories RHSA-2024:6206RHSA-2024:3627RHSA-2024:3618RHSA-2024:7003RHSA-2024:7002RHSA-2024:5257

  • 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
  • kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
  • kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
  • kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1

suse advisories SUSE-SU-2025:20028-1SUSE-SU-2025:20008-1SUSE-SU-2024:2973-1SUSE-SU-2024:2203-1SUSE-SU-2024:2135-1SUSE-SU-2024:1870-1

  • kernel AlmaLinux 8 4.18.0-553.5.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.5.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.5.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.5.1.el8_10

almalinux advisories ALSA-2024:3618ALSA-2024:3619ALSA-2024:3627

  • kernel Rocky Linux 9 5.14.0-427.20.1.el9_4
  • kernel-rt Rocky Linux 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel Rocky Linux 8 4.18.0-553.5.1.el8_10

rocky linux advisories RLSA-2024:3619RLSA-2024:3627RLSA-2024:3618

  • hyperv-daemons CBL-Mariner 2.0 5.15.158.1-1

azure linux advisories AZL-40511

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

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-2024-26993 updated cvss 5.5

kernel: fs: sysfs: Fix reference leak in sysfs_break_active_protection()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.70.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.70.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.70.1.el8_8
    fixed: vendor fix RHSA-2024:6206
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.67.1.el9_2
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.20.1.el9_4, perf 5.14.0-427.20.1.el9_4, rtla 5.14.0-427.20.1.el9_4, kernel-devel-matched 5.14.0-427.20.1.el9_4, kernel-64k-devel-matched 5.14.0-427.20.1.el9_4, kernel-debug-devel-matched 5.14.0-427.20.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:3619
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.112.1.el9_0, kernel-devel-matched 5.14.0-70.112.1.el9_0, kernel-debug-devel-matched 5.14.0-70.112.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.112.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.112.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.112.1.el9_0, +2 more
    fixed: vendor fix RHSA-2024:5257
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.67.1.el9_2, rtla 5.14.0-284.67.1.el9_2, kernel-devel-matched 5.14.0-284.67.1.el9_2, kernel-64k-devel-matched 5.14.0-284.67.1.el9_2, kernel-debug-devel-matched 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.67.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.5.1.el8_10, kernel 4.18.0-553.5.1.el8_10, bpftool 4.18.0-553.5.1.el8_10, kernel-core 4.18.0-553.5.1.el8_10, kernel-tools 4.18.0-553.5.1.el8_10, python3-perf 4.18.0-553.5.1.el8_10, +15 more
    fixed: vendor fix RHSA-2024:3618
show 22 more
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.20.1.el9_4, kernel 5.14.0-427.20.1.el9_4, kernel-64k 5.14.0-427.20.1.el9_4, kernel-core 5.14.0-427.20.1.el9_4, kernel-tools 5.14.0-427.20.1.el9_4, python3-perf 5.14.0-427.20.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:3619
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.141.1.el8_4, kernel 4.18.0-305.141.1.el8_4, bpftool 4.18.0-305.141.1.el8_4, kernel-core 4.18.0-305.141.1.el8_4, kernel-tools 4.18.0-305.141.1.el8_4, python3-perf 4.18.0-305.141.1.el8_4, +8 more
    fixed: vendor fix RHSA-2024:7002
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.109.1.el8_6, kernel 4.18.0-372.109.1.el8_6, bpftool 4.18.0-372.109.1.el8_6, kernel-core 4.18.0-372.109.1.el8_6, kernel-tools 4.18.0-372.109.1.el8_6, python3-perf 4.18.0-372.109.1.el8_6, +8 more
    fixed: vendor fix RHSA-2024:4107
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.141.1.el8_4, kernel 4.18.0-305.141.1.el8_4, bpftool 4.18.0-305.141.1.el8_4, kernel-core 4.18.0-305.141.1.el8_4, kernel-tools 4.18.0-305.141.1.el8_4, python3-perf 4.18.0-305.141.1.el8_4, +9 more
    fixed: vendor fix RHSA-2024:7002
  • Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.109.1.el8_6, kernel 4.18.0-372.109.1.el8_6, bpftool 4.18.0-372.109.1.el8_6, kernel-core 4.18.0-372.109.1.el8_6, kernel-tools 4.18.0-372.109.1.el8_6, python3-perf 4.18.0-372.109.1.el8_6, +15 more
    fixed: vendor fix RHSA-2024:4107
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.112.1.el9_0, bpftool 5.14.0-70.112.1.el9_0, kernel-core 5.14.0-70.112.1.el9_0, kernel-tools 5.14.0-70.112.1.el9_0, python3-perf 5.14.0-70.112.1.el9_0, kernel-modules 5.14.0-70.112.1.el9_0, +14 more
    fixed: vendor fix RHSA-2024:5257
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.70.1.el8_8, kernel 4.18.0-477.70.1.el8_8, bpftool 4.18.0-477.70.1.el8_8, kernel-core 4.18.0-477.70.1.el8_8, kernel-tools 4.18.0-477.70.1.el8_8, python3-perf 4.18.0-477.70.1.el8_8, +15 more
    fixed: vendor fix RHSA-2024:6206
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.67.1.el9_2, kernel 5.14.0-284.67.1.el9_2, kernel-64k 5.14.0-284.67.1.el9_2, kernel-core 5.14.0-284.67.1.el9_2, kernel-tools 5.14.0-284.67.1.el9_2, python3-perf 5.14.0-284.67.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.141.1.el8_4, kernel 4.18.0-305.141.1.el8_4, bpftool 4.18.0-305.141.1.el8_4, kernel-core 4.18.0-305.141.1.el8_4, kernel-tools 4.18.0-305.141.1.el8_4, python3-perf 4.18.0-305.141.1.el8_4, +8 more
    fixed: vendor fix RHSA-2024:7002
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.109.1.el8_6, kernel 4.18.0-372.109.1.el8_6, bpftool 4.18.0-372.109.1.el8_6, kernel-core 4.18.0-372.109.1.el8_6, kernel-tools 4.18.0-372.109.1.el8_6, python3-perf 4.18.0-372.109.1.el8_6, +8 more
    fixed: vendor fix RHSA-2024:4107
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.5.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.5.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.5.1.el8_10
    fixed: vendor fix RHSA-2024:3618
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.20.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.20.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.20.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.20.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.20.1.el9_4
    fixed: vendor fix RHSA-2024:3619
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-kvm 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-kvm 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-core 4.18.0-553.5.1.rt7.346.el8_10, +4 more
    fixed: vendor fix RHSA-2024:3627
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.20.1.el9_4, kernel-rt-kvm 5.14.0-427.20.1.el9_4, kernel-rt-core 5.14.0-427.20.1.el9_4, kernel-rt-modules 5.14.0-427.20.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.20.1.el9_4, kernel-rt-debug-core 5.14.0-427.20.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:3619
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-kvm 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-core 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-modules 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-kvm 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-core 5.14.0-70.112.1.rt21.184.el9_0, +4 more
    fixed: vendor fix RHSA-2024:5256
  • Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-kvm 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-core 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-modules 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-kvm 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-core 4.18.0-305.141.1.rt7.217.el8_4, +4 more
    fixed: vendor fix RHSA-2024:7003
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-core 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-modules 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-core 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-modules 5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-modules-extra 5.14.0-70.112.1.rt21.184.el9_0, +2 more
    fixed: vendor fix RHSA-2024:5256
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-modules 5.14.0-284.67.1.rt14.352.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-kvm 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-kvm 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-core 5.14.0-284.67.1.rt14.352.el9_2, +6 more
    fixed: vendor fix RHSA-2024:3460
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules-extra 4.18.0-553.5.1.rt7.346.el8_10, +2 more
    fixed: vendor fix RHSA-2024:3627
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.20.1.el9_4, kernel-rt-core 5.14.0-427.20.1.el9_4, kernel-rt-modules 5.14.0-427.20.1.el9_4, kernel-rt-debug-core 5.14.0-427.20.1.el9_4, kernel-rt-modules-core 5.14.0-427.20.1.el9_4, kernel-rt-debug-modules 5.14.0-427.20.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:3619
  • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-core 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-modules 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-core 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-modules 4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-modules-extra 4.18.0-305.141.1.rt7.217.el8_4, +2 more
    fixed: vendor fix RHSA-2024:7003
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.67.1.el9_2 Red Hat Enterprise Linux BaseOS AUS (v.8.6) kernel-doc 4.18.0-372.109.1.el8_6 Red Hat Enterprise Linux BaseOS E4S (v.8.6) kernel-doc 4.18.0-372.109.1.el8_6 Red Hat Enterprise Linux BaseOS TUS (v.8.6) kernel-doc 4.18.0-372.109.1.el8_6
    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 5.5

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 ICSA-25-226-15 updated cvss 5.5

Siemens SINEC OS

  • Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) < 3.1 Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family < 3.1
    affected: fixed in V3.1 support.industry.siemens.com
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
    not affected

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

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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 RUGGEDCOM RST2428P
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Classification

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.