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NVD / CVE Program· CNA Linux

CVE-2024-42304: ext4: make sure the first directory block is not a hole

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.23% (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 299bc6ffa57e04e74c6cce866d6c0741fb4897a1, 4.10, 4.15.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 299bc6ffa57e04e74c6cce866d6c0741fb4897a1, 4.10, 4.15 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: ext4: make sure the first directory block is not a hole The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow. ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh && (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported. After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash. Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.

Published
Aug 17, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 14th 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.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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

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

    • 3f0307b0d2d8b333a6964fc4c820dc86896fd1cf, 514631c2225c1fd556c799cc1893fb27b0f48f00, 7f1f86276515f6816a98f6ca3ef99c827d54642f, 5021b7a5bdd6bb859eb648c3da71cdd6aae1d133, 5.3affected
    • 3a17ca864baffc0c6f6e8aad525aa4365775a193 and later · before d81d7e347d1f1f48a5634607d39eb90c161c8afeaffected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before e02f9941e8c011aa3eafa799def6a134ce06bcfaaffected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before de2a011a13a46468a6e8259db58b1b62071fe136affected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before 9771e3d8365ae1dd5e8846a204cb9af14e3e656aaffected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before b609753cbbd38f8c0affd4956c0af178348523acaffected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before c3893d9de8ee153baac56d127d844103488133b5affected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before 299bc6ffa57e04e74c6cce866d6c0741fb4897a1affected · git
    • 4e19d6b65fb4fc42e352ce9883649e049da14743 and later · before f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6affected · git
    • 4.19.62 and later · before 4.19.320affected · semver
Affected versions · NVD (10)

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

  • linux linux kernel4.9.187 and later · before 4.10
  • linux linux kernel4.14.135 and later · before 4.15
  • linux linux kernel4.19.62 and later · before 4.19.320
  • linux linux kernel5.1.21 and later · before 5.2
  • linux linux kernel5.2.4 and later · before 5.4.282
  • linux linux kernel5.5 and later · before 5.10.224
  • linux linux kernel5.11 and later · before 5.15.165
  • linux linux kernel5.16 and later · before 6.1.103
  • linux linux kernel6.2 and later · before 6.6.44
  • linux linux kernel6.7 and later · before 6.10.3

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.106-16.1.106-1
Debian:13linuxbefore 6.10.3-16.10.3-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.14.16.4.0-150600.8.14.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.25.1.150600.12.10.26.4.0-150600.23.25.1.150600.12.10.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.25.26.4.0-150600.23.25.2
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.25.26.4.0-150600.23.25.2
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.14.16.4.0-150600.10.14.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.14.16.4.0-150600.10.14.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.14.16.4.0-150600.8.14.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.14.16.4.0-150600.10.14.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.14.16.4.0-150600.8.14.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.14.16.4.0-150600.10.14.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_5before 1-150600.13.3.11-150600.13.3.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_4before 1-150600.1.3.11-150600.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-64kbbefore 6.4.0-150600.23.25.16.4.0-150600.23.25.1

+22

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-2024-42292Aug 17, 2024 · kobject_uevent: Fix OOB access within zap_modalias_env()
    28Monitor
  • ← EarlierCVE-2024-42302Aug 17, 2024 · PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal
    31Monitor
  • Later →CVE-2024-42305Aug 17, 2024 · ext4: check dot and dotdot of dx_root before making dir indexed
    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 Linux299bc6ffa57e04e74c6cce866d6c0741fb4897a1Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.19.320Vendor (CNA)
Linux Linux5.2Vendor (CNA)
Linux Linux5.3Vendor (CNA)
Linux Linux9771e3d8365ae1dd5e8846a204cb9af14e3e656aVendor (CNA)
Linux Linuxb609753cbbd38f8c0affd4956c0af178348523acVendor (CNA)
Linux Linuxc3893d9de8ee153baac56d127d844103488133b5Vendor (CNA)
Linux Linuxd81d7e347d1f1f48a5634607d39eb90c161c8afeVendor (CNA)
Linux Linuxde2a011a13a46468a6e8259db58b1b62071fe136Vendor (CNA)
Linux Linuxe02f9941e8c011aa3eafa799def6a134ce06bcfaVendor (CNA)
Linux Linuxf9ca51596bbfd0f9c386dd1c613c394c78d9e5e6Vendor (CNA)
debian:linux6.1.106-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.14.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.25.1.150600.12.10.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.25.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.25.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.14.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.14.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.25.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-azure6.4.0-150600.8.14.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)
suse:kernel-default6.4.0-150600.23.25.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.25.1.150600.12.10.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)

+8

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.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (10 more)

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

All records