CVE-2026-93121Hinoki check available

Memory corruption via uninitialized DMA fence cleanup

Published Sep 17, 2026 · Updated Sep 18, 2026

Memory corruption in affected Linux kernel branches allows local users to trigger undefined behavior through FunctionFS DMA-buffer transfers. The ffs_dmabuf_transfer() error paths call dma_fence_put() after allocation but before dma_fence_init(), leaving the reference count and operations uninitialized. Reachability requires local low-privileged access to a FunctionFS endpoint and either endpoint shutdown or request-allocation failure; the precise consequence is undisclosed.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory corruption in affected Linux kernel branches allows local users to trigger undefined behavior through FunctionFS DMA-buffer transfers. The ffs_dmabuf_transfer() error paths call dma_fence_put() after allocation but before dma_fence_init(), leaving the reference count and operations uninitialized. Reachability requires local low-privileged access to a FunctionFS endpoint and either endpoint shutdown or request-allocation failure; the precise consequence is undisclosed.

The record

CVE
CVE-2026-93121
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=6.9
  2. Affected versionversion=7b07a2a7ca02a20124b552be96c5a56910795488 <58952c83dfe6ea3294a74734d2d1018c1120779a
  3. Affected versionversion=7b07a2a7ca02a20124b552be96c5a56910795488 <5fd8baacc7dc477df9cac61b45491840247a9b1e
  4. Affected versionversion=7b07a2a7ca02a20124b552be96c5a56910795488 <621707dc67c9846fd876d7579ec951d92aa033f1
  5. Affected versionversion=7b07a2a7ca02a20124b552be96c5a56910795488 <be539138d9a187af3b884525a395db10797c64f1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=7b07a2a7ca02a20124b552be96c5a56910795488 <58952c83dfe6ea3294a74734d2d1018c1120779a; version=7b07a2a7ca02a20124b552be96c5a56910795488 <5fd8baacc7dc477df9cac61b45491840247a9b1e; version=7b07a2a7ca02a20124b552be96c5a56910795488 <621707dc67c9846fd876d7579ec951d92aa033f1; version=7b07a2a7ca02a20124b552be96c5a56910795488 <be539138d9a187af3b884525a395db10797c64f1

Published CVSS scores

7.0Linux Kernel CNACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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