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NVD / CVE Program· CNA Linux

CVE-2024-43856: dma: fix call order in dmam_free_coherent

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: 0.41% (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 1fe97f68fce1ba24bf823bfb0eb0956003473130, 22094f5f52e7bc16c5bf9613365049383650b02e, 257193083e8f43907e99ea633820fc2b3bcd24c7; Azure Linux 3.0 ARM 6.6.47.1-1; Azure Linux 3.0 x64 6.6.47.1-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 1fe97f68fce1ba24bf823bfb0eb0956003473130, 22094f5f52e7bc16c5bf9613365049383650b02e, 257193083e8f43907e99ea633820fc2b3bcd24c7; Azure Linux 3.0 ARM 6.6.47.1-1; Azure Linux 3.0 x64 6.6.47.1-1 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: dma: fix call order in dmam_free_coherent dmam_free_coherent() frees a DMA allocation, which makes the freed vaddr available for reuse, then calls devres_destroy() to remove and free the data structure used to track the DMA allocation. Between the two calls, it is possible for a concurrent task to make an allocation with the same vaddr and add it to the devres list. If this happens, there will be two entries in the devres list with the same vaddr and devres_destroy() can free the wrong entry, triggering the WARN_ON() in dmam_match. Fix by destroying the devres entry before freeing the DMA allocation. kokonut //net/encryption http://sponge2/b9145fe6-0f72-4325-ac2f-a84d81075b03

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 17, 2024
Updated
Oct 15, 2026
EPSS
0.4% · 35th 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 · 0.4%

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-2024-43856

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 kernel2.6.21 and later · before 4.19.320
  • linux linux kernel4.20 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

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

    • 2.6.21affected
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before fe2d246080f035e0af5793cb79067ba125e4fb63affected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 2f7bbdc744f2e7051d1cb47c8e082162df1923c9affected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 257193083e8f43907e99ea633820fc2b3bcd24c7affected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 87b34c8c94e29fa01d744e5147697f592998d954affected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before f993a4baf6b622232e4c190d34c220179e5d61ebaffected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 1fe97f68fce1ba24bf823bfb0eb0956003473130affected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 22094f5f52e7bc16c5bf9613365049383650b02eaffected · git
    • 9ac7849e35f705830f7b016ff272b0ff1f7ff759 and later · before 28e8b7406d3a1f5329a03aa25a43aa28e087cb20affected · git
    • before 2.6.21not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.106-16.1.106-1
Debian:13linuxbefore 6.10.3-16.10.3-1

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-2024-43834Aug 17, 2024 · xdp: fix invalid wait context of page_pool_destroy()
    22Monitor
  • ← EarlierCVE-2024-43850Aug 17, 2024 · soc: qcom: icc-bwmon: Fix refcount imbalance seen during bwmon_remove
    22Monitor
  • Later →CVE-2024-43858Aug 17, 2024 · jfs: Fix array-index-out-of-bounds in diFree
    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 Linux1fe97f68fce1ba24bf823bfb0eb0956003473130Vendor (CNA)
Linux Linux22094f5f52e7bc16c5bf9613365049383650b02eVendor (CNA)
Linux Linux257193083e8f43907e99ea633820fc2b3bcd24c7Vendor (CNA)
Linux Linux28e8b7406d3a1f5329a03aa25a43aa28e087cb20Vendor (CNA)
Linux Linux2f7bbdc744f2e7051d1cb47c8e082162df1923c9Vendor (CNA)
Linux Linux87b34c8c94e29fa01d744e5147697f592998d954Vendor (CNA)
Linux Linuxf993a4baf6b622232e4c190d34c220179e5d61ebVendor (CNA)
Linux Linuxfe2d246080f035e0af5793cb79067ba125e4fb63Vendor (CNA)
Azure Linux 3.0 ARM6.6.47.1-1 · kernelMicrosoft (MSRC)
Azure Linux 3.0 x646.6.47.1-1 · kernelMicrosoft (MSRC)
CBL Mariner 2.0 ARM5.15.167.1-1 · kernelMicrosoft (MSRC)
CBL Mariner 2.0 x645.15.167.1-1 · kernelMicrosoft (MSRC)
debian:linux6.1.106-1 · 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.

  • CVE-2021-47137145 days apartnet: lantiq: fix memory corruption in RX ring
    39Monitor
  • CVE-2024-3596989 days apartipv6: fix race condition between ipv6_get_ifaddr and ipv6_del_addr
    35Monitor
  • CVE-2024-3402754 days apartf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
    31Monitor
  • CVE-2021-4755185 days apartdrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
    31Monitor
  • CVE-2021-47130155 days apartnvmet: fix freeing unallocated p2pmem
    30Monitor
  • CVE-2024-26894122 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).

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 (10 more)

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

All records