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CVE-2024-39482· NVD / CVE Program· CNA Linux

bcache: fix variable length array abuse in btree_iter

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 0c31344e22dd8d6b1394c6e4c41d639015bdc671, 2c3d7b03b658dc8bfa6112b194b67b92a87e081b, 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31; azl3 kernel 6.6.22.1-2 on Azure Linux 3.0 6.6.35.1-5; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 -.
  • 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 0c31344e22dd8d6b1394c6e4c41d639015bdc671, 2c3d7b03b658dc8bfa6112b194b67b92a87e081b, 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31; azl3 kernel 6.6.22.1-2 on Azure Linux 3.0 6.6.35.1-5; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 - 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: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 5, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 14th 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.

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.

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.

Follow CVE-2024-39482

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 kernel5.10 and later · before 5.10.221
  • linux linux kernel5.15 and later · before 5.15.162
  • linux linux kernel6.1 and later · before 6.1.94
  • linux linux kernel6.6 and later · before 6.6.34
  • linux linux kernel6.9 and later · before 6.9.5

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

    • 3.10affected
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 2c3d7b03b658dc8bfa6112b194b67b92a87e081baffected · git
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 5a1922adc5798b7ec894cd3f197afb6f9591b023affected · git
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 934e1e4331859183a861f396d7dfaf33cb5afb02affected · git
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 6479b9f41583b013041943c4602e1ad61cec8148affected · git
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 0c31344e22dd8d6b1394c6e4c41d639015bdc671affected · git
    • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 and later · before 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31affected · git
    • before 3.10not affected · semver
    • 5.10.221 and later · up to and including 5.10.*not affected · semver
    • 5.15.162 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.94-16.1.94-1
Debian:13linuxbefore 6.9.7-16.9.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-39484Jul 5, 2024 · mmc: davinci: Don't strip remove function when driver is builtin
    22Monitor
  • ← EarlierCVE-2024-39485Jul 5, 2024 · media: v4l: async: Properly re-initialise notifier entry in unregister
    22Monitor
  • Later →CVE-2024-39486Jul 6, 2024 · drm/drm_file: Fix pid refcounting race
    28Monitor

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 Linux0c31344e22dd8d6b1394c6e4c41d639015bdc671Vendor (CNA)
Linux Linux2c3d7b03b658dc8bfa6112b194b67b92a87e081bVendor (CNA)
Linux Linux3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31Vendor (CNA)
Linux Linux5a1922adc5798b7ec894cd3f197afb6f9591b023Vendor (CNA)
Linux Linux6479b9f41583b013041943c4602e1ad61cec8148Vendor (CNA)
Linux Linux934e1e4331859183a861f396d7dfaf33cb5afb02Vendor (CNA)
azl3 kernel 6.6.22.1-2 on Azure Linux 3.06.6.35.1-5 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.35.1-5 on Azure Linux 3.0- · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.160.1-1 on CBL Mariner 2.05.15.162.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.162.2-1 on CBL Mariner 2.05.15.162.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.94-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

  • CVE-2021-47137102 days apartnet: lantiq: fix memory corruption in RX ring
    39Monitor
  • CVE-2024-3596946 days apartipv6: fix race condition between ipv6_get_ifaddr and ipv6_del_addr
    35Monitor
  • CVE-2024-3402711 days apartf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
    31Monitor
  • CVE-2021-4755142 days apartdrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
    31Monitor
  • CVE-2021-47130112 days apartnvmet: fix freeing unallocated p2pmem
    30Monitor
  • CVE-2024-2689479 days apartACPI: processor_idle: Fix memory leak in acpi_processor_power_exit()
    24Monitor

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)

CWE-770 · Allocation of Resources Without Limits or Throttling

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records