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NVD / CVE Program· CNA Linux

CVE-2024-47699: nilfs2: fix potential null-ptr-deref in nilfs_btree_insert()

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 1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343, 21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34, 24bf40740a3da6b4056721da34997ae6938f3da1; Azure Linux 3.0 ARM 6.6.56.1-5; Azure Linux 3.0 x64 6.6.56.1-5.

Low priority for now. Upgrade to Linux Linux 1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343, 21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34, 24bf40740a3da6b4056721da34997ae6938f3da1; Azure Linux 3.0 ARM 6.6.56.1-5; Azure Linux 3.0 x64 6.6.56.1-5 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: nilfs2: fix potential null-ptr-deref in nilfs_btree_insert() Patch series "nilfs2: fix potential issues with empty b-tree nodes". This series addresses three potential issues with empty b-tree nodes that can occur with corrupted filesystem images, including one recently discovered by syzbot. This patch (of 3): If a b-tree is broken on the device, and the b-tree height is greater than 2 (the level of the root node is greater than 1) even if the number of child nodes of the b-tree root is 0, a NULL pointer dereference occurs in nilfs_btree_prepare_insert(), which is called from nilfs_btree_insert(). This is because, when the number of child nodes of the b-tree root is 0, nilfs_btree_do_lookup() does not set the block buffer head in any of path[x].bp_bh, leaving it as the initial value of NULL, but if the level of the b-tree root node is greater than 1, nilfs_btree_get_nonroot_node(), which accesses the buffer memory of path[x].bp_bh, is called. Fix this issue by adding a check to nilfs_btree_root_broken(), which performs sanity checks when reading the root node from the device, to detect this inconsistency. Thanks to Lizhi Xu for trying to solve the bug and clarifying the cause early on.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 21, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 17th percentile

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

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  • when exploit code appears or is weaponized
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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 kernel2.6.30 and later · before 5.10.227
  • linux linux kernel5.11 and later · before 5.15.168
  • linux linux kernel5.16 and later · before 6.1.113
  • linux linux kernel6.2 and later · before 6.6.54
  • linux linux kernel6.7 and later · before 6.10.13
  • linux linux kernel6.11 and later · before 6.11.2

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

    • 2.6.30affected
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0affected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343affected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 24bf40740a3da6b4056721da34997ae6938f3da1affected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 73d23ecf234b7a6d47fb883f2dabe10e3230b31daffected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before f68523e0f26faade18833fbef577a4295d8e2c94affected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34affected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before db73500d3f0e558eb642aae1d4782e7726b4a03faffected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 3644554d308ddf2669e459a1551a7edf60b2d62baffected · git
    • 17c76b0104e4a6513983777e1a17e0297a12b0c4 and later · before 9403001ad65ae4f4c5de368bdda3a0636b51d51aaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.115-16.1.115-1
Debian:13linuxbefore 6.11.2-16.11.2-1

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-2024-47696Oct 21, 2024 · RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency
    31Monitor
  • ← EarlierCVE-2024-47697Oct 21, 2024 · drivers: media: dvb-frontends/rtl2830: fix an out-of-bounds write error
    31Monitor
  • Later →CVE-2024-47701Oct 21, 2024 · ext4: avoid OOB when system.data xattr changes underneath the filesystem
    31Monitor

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 Linux1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343Vendor (CNA)
Linux Linux21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34Vendor (CNA)
Linux Linux24bf40740a3da6b4056721da34997ae6938f3da1Vendor (CNA)
Linux Linux2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0Vendor (CNA)
Linux Linux3644554d308ddf2669e459a1551a7edf60b2d62bVendor (CNA)
Linux Linux73d23ecf234b7a6d47fb883f2dabe10e3230b31dVendor (CNA)
Linux Linux9403001ad65ae4f4c5de368bdda3a0636b51d51aVendor (CNA)
Linux Linuxdb73500d3f0e558eb642aae1d4782e7726b4a03fVendor (CNA)
Linux Linuxf68523e0f26faade18833fbef577a4295d8e2c94Vendor (CNA)
Azure Linux 3.0 ARM6.6.56.1-5 · kernelMicrosoft (MSRC)
Azure Linux 3.0 x646.6.56.1-5 · kernelMicrosoft (MSRC)
debian:linux6.1.115-1 · Debian:12Package registry (OSV)

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).

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)

CWE-476 · NULL Pointer Dereference

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 (12 more)

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

All records