CVE-2026-63929

Local denial of service via DMA fence leak

Published Jul 19, 2026 · Updated Jul 19, 2026

Resource leak in the Linux kernel IIO buffer subsystem allows local users to exhaust memory by repeatedly enqueueing DMA buffers. iio_buffer_enqueue_dmabuf() initializes a fence with one reference, dma_resv_add_fence() takes another, and the success path omits dma_fence_put(), permanently leaking one kmalloc-128 allocation per enqueue. Access requires a local user and an IIO device with buffer support; sustained enqueues can leave the system unstable or unresponsive.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel IIO buffer subsystem allows local users to exhaust memory by repeatedly enqueueing DMA buffers. iio_buffer_enqueue_dmabuf() initializes a fence with one reference, dma_resv_add_fence() takes another, and the success path omits dma_fence_put(), permanently leaking one kmalloc-128 allocation per enqueue. Access requires a local user and an IIO device with buffer support; sustained enqueues can leave the system unstable or unresponsive.

The record

CVE
CVE-2026-63929
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <3412a95afaa5d3262008dfc34f3c7be33d8151dc
  2. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <9678aeed8b77d495a417dd057d479f3733094019
  3. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <96cdeaba6a008503455b78a9641c05c2a886a7ec
  4. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <a093999355084bdbfe6e97f1dd232e58a1525f0b
  5. Affected versionversion=6.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <3412a95afaa5d3262008dfc34f3c7be33d8151dc; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <9678aeed8b77d495a417dd057d479f3733094019; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <96cdeaba6a008503455b78a9641c05c2a886a7ec; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <a093999355084bdbfe6e97f1dd232e58a1525f0b; version=6.11

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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