CVE-2025-38095

Local crash via misordered dma-buf fence publication

Published Jul 3, 2025 · Updated Aug 5, 2026

NULL pointer dereference in affected Linux kernel builds allows local users to crash the system via concurrent dma-buf fence operations. In drivers/dma-buf/dma-resv.c, smp_store_mb() publishes num_fences before the intended memory barrier, so lockless readers can observe the count before its fence pointer is initialized. A low-privileged local process must race dma-buf fence import against export or synchronization operations; a successful race causes an availability-only kernel crash.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel builds allows local users to crash the system via concurrent dma-buf fence operations. In drivers/dma-buf/dma-resv.c, smp_store_mb() publishes num_fences before the intended memory barrier, so lockless readers can observe the count before its fence pointer is initialized. A low-privileged local process must race dma-buf fence import against export or synchronization operations; a successful race causes an availability-only kernel crash.

The record

CVE
CVE-2025-38095
Published
Jul 3, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.0
  2. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <08680c4dadc6e736c75bc2409d833f03f9003c51
  3. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <3becc659f9cb76b481ad1fb71f54d5c8d6332d3f
  4. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <72c7d62583ebce7baeb61acce6057c361f73be4a
  5. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f
  6. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <c9d2b9a80d06a58f37e0dc8c827075639b443927
  7. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <d0b7f11dd68b593bd970e5735be00e8d89bace30
  8. Affected versionversion=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <fe1bebd0edb22e3536cbc920ec713331d1367ad4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <08680c4dadc6e736c75bc2409d833f03f9003c51; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <3becc659f9cb76b481ad1fb71f54d5c8d6332d3f; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <72c7d62583ebce7baeb61acce6057c361f73be4a; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <c9d2b9a80d06a58f37e0dc8c827075639b443927; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <d0b7f11dd68b593bd970e5735be00e8d89bace30; version=a590d0fdbaa56f482ff515e1040b6d9b1b200d63 <fe1bebd0edb22e3536cbc920ec713331d1367ad4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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