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NVD / CVE Program· CNA Linux

CVE-2024-26993: fs: sysfs: Fix reference leak in sysfs_break_active_protection()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3.17, 3.19, 4.10; azl3 hyperv-daemons 6.6.22.1-2 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3.17, 3.19, 4.10; azl3 hyperv-daemons 6.6.22.1-2 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 18th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.16.62 and later · before 3.17
  • linux linux kernel3.18.121 and later · before 3.19
  • linux linux kernel4.4.154 and later · before 4.5
  • linux linux kernel4.9.125 and later · before 4.10
  • linux linux kernel4.14.68 and later · before 4.15
  • linux linux kernel4.18.6 and later · before 4.19
  • linux linux kernel4.19 and later · before 5.15.157
  • linux linux kernel5.16 and later · before 6.1.88
  • linux linux kernel6.2 and later · before 6.6.29
  • linux linux kernel6.7 and later · before 6.8.8
  • linux linux kernel6.9

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • e8a37b2fd5b5087bec6cbbf6946ee3caa712953b, a6abc93760dd07fcd29760b70e6e7520f22cb288, 461a6385e58e8247e6ba2005aa5d1b8d980ee4a2, 8a5e02a0f46ea33ed19e48e096a8e8d28e73d10a, c984f4d1d40a2f349503b3faf946502ccbf02f9f, 807d1d299a04e9ad9a9dac55419c1137a105254b, 4.19affected
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before f28bba37fe244889b81bb5c508d3f6e5c6e342c5affected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before 57baab0f376bec8f54b0fe6beb8f77a57c228063affected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before 84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17affected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before 43f00210cb257bcb0387e8caeb4b46375d67f30caffected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before 5d43e072285e81b0b63cee7189b3357c7768a43baffected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before ac107356aabc362aaeb77463e814fc067a5d3957affected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before a4c99b57d43bab45225ba92d574a8683f9edc8e4affected · git
    • 2afc9166f79b8f6da5f347f48515215ceee4ae37 and later · before a90bca2228c0646fc29a72689d308e5fe03e6d78affected · git
    • 3.16.62 and later · before 3.17affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.20.1.el9_47.3.0-427.20.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.20.1.el9_45.14.0-427.20.1.el9_4

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-26982May 1, 2024 · Squashfs: check the inode number is not the invalid value of zero
    28Monitor
  • ← EarlierCVE-2024-26988May 1, 2024 · init/main.c: Fix potential static_command_line memory overflow
    31Monitor
  • Later →CVE-2024-27004May 1, 2024 · clk: Get runtime PM before walking tree during disable_unused
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3.17Vendor (CNA)
Linux Linux3.19Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.19Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux43f00210cb257bcb0387e8caeb4b46375d67f30cVendor (CNA)
Linux Linux57baab0f376bec8f54b0fe6beb8f77a57c228063Vendor (CNA)
Linux Linux5d43e072285e81b0b63cee7189b3357c7768a43bVendor (CNA)
Linux Linux84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17Vendor (CNA)
Linux Linuxa4c99b57d43bab45225ba92d574a8683f9edc8e4Vendor (CNA)
Linux Linuxa90bca2228c0646fc29a72689d308e5fe03e6d78Vendor (CNA)
Linux Linuxac107356aabc362aaeb77463e814fc067a5d3957Vendor (CNA)
Linux Linuxf28bba37fe244889b81bb5c508d3f6e5c6e342c5Vendor (CNA)
azl3 hyperv-daemons 6.6.22.1-2 on Azure Linux 3.06.6.35.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.06.6.35.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 hyperv-daemons 5.15.153.1-1 on CBL Mariner 2.05.15.158.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 hyperv-daemons 5.15.158.1-1 on CBL Mariner 2.05.15.158.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool7.3.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.20.1.el9_4 · AlmaLinux:9Package registry (OSV)

+14

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (14 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records