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NVD / CVE Program· CNA Linux

CVE-2024-43863: drm/vmwgfx: Fix a deadlock in dma buf fence polling

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: 0.16% (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 3b933b16c996af8adb6bc1b5748a63dfb41a82bc, 9908dc0d2ef0e4aec8a242c098455729c0e2f017, 9e20d028d8d1deb1e7fed18f22ffc01669cf3237; CBL Mariner 2.0 ARM 5.15.167.1-1; CBL Mariner 2.0 x64 5.15.167.1-1.

Low priority for now. Upgrade to Linux Linux 3b933b16c996af8adb6bc1b5748a63dfb41a82bc, 9908dc0d2ef0e4aec8a242c098455729c0e2f017, 9e20d028d8d1deb1e7fed18f22ffc01669cf3237; CBL Mariner 2.0 ARM 5.15.167.1-1; CBL Mariner 2.0 x64 5.15.167.1-1 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: drm/vmwgfx: Fix a deadlock in dma buf fence polling Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks. vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock. dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called. Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 20, 2024
Updated
Jun 17, 2026
EPSS
0.1% · 5th 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 · 0.1%

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.

Follow CVE-2024-43863

When you'll hear from us

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  • 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 kernel3.18 and later · before 5.15.165
  • linux linux kernel5.16 and later · before 6.1.104
  • linux linux kernel6.2 and later · before 6.6.45
  • linux linux kernel6.7 and later · before 6.10.4
  • linux linux kernel6.11

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

    • 3.18affected
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before 9908dc0d2ef0e4aec8a242c098455729c0e2f017affected · git
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before 9e20d028d8d1deb1e7fed18f22ffc01669cf3237affected · git
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before 3b933b16c996af8adb6bc1b5748a63dfb41a82bcaffected · git
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before a8943969f9ead2fd3044fc826140a21622ef830eaffected · git
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before c98ab18b9f315ff977c2c65d7c71298ef98be8e3affected · git
    • 2298e804e96eb3635c39519c8287befd92460303 and later · before e58337100721f3cc0c7424a18730e4f39844934faffected · git
    • before 3.18not affected · semver
    • 5.10.238 and later · up to and including 5.10.*not affected · semver
    • 5.15.165 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 6.1.106-16.1.106-1
Debian:13linuxbefore 6.10.4-16.10.4-1

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-2024-43861Aug 20, 2024 · net: usb: qmi_wwan: fix memory leak for not ip packets
    22Monitor
  • ← EarlierCVE-2024-43862Aug 20, 2024 · net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex
    22Monitor
  • Later →CVE-2024-43864Aug 20, 2024 · net/mlx5e: Fix CT entry update leaks of modify header context
    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 Linux3b933b16c996af8adb6bc1b5748a63dfb41a82bcVendor (CNA)
Linux Linux9908dc0d2ef0e4aec8a242c098455729c0e2f017Vendor (CNA)
Linux Linux9e20d028d8d1deb1e7fed18f22ffc01669cf3237Vendor (CNA)
Linux Linuxa8943969f9ead2fd3044fc826140a21622ef830eVendor (CNA)
Linux Linuxc98ab18b9f315ff977c2c65d7c71298ef98be8e3Vendor (CNA)
Linux Linuxe58337100721f3cc0c7424a18730e4f39844934fVendor (CNA)
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.

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-667 · Improper Locking

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 (7 more)

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

All records