CVE-2026-43007

Local process hang via stale DBC state

Published May 1, 2026 · Updated May 1, 2026

Resource cleanup failure in the Linux kernel QAIC driver allows local users to hang a later user's network-loading process via a stale DBC. decode_deactivate() runs only in the departing owner's qaic_manage_ioctl() context, so a late QAIC_TRANS_DEACTIVATE_FROM_DEV transaction leaves the DBC marked in use and its resources allocated. A second user must load a network that receives the stale DBC; the process then waits indefinitely for dbc->in_use to clear.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource cleanup failure in the Linux kernel QAIC driver allows local users to hang a later user's network-loading process via a stale DBC. decode_deactivate() runs only in the departing owner's qaic_manage_ioctl() context, so a late QAIC_TRANS_DEACTIVATE_FROM_DEV transaction leaves the DBC marked in use and its resources allocated. A second user must load a network that receives the stale DBC; the process then waits indefinitely for dbc->in_use to clear.

The record

CVE
CVE-2026-43007
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=129776ac2e38231fa9c02ce20e116c99de291666 <08021f2d4a557d6491e3bcc288e96425f50aa3cf
  2. Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <2dd67966f39a2abf8ccb4865031c722e40e01b7f
  3. Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <2feec5ae5df785658924ab6bd91280dc3926507c
  4. Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <ee0180e77e6c8482644569632065411de844c515
  5. Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <f403094d9075d7c565a3d81002b781c325cb3c07
  6. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=129776ac2e38231fa9c02ce20e116c99de291666 <08021f2d4a557d6491e3bcc288e96425f50aa3cf; version=129776ac2e38231fa9c02ce20e116c99de291666 <2dd67966f39a2abf8ccb4865031c722e40e01b7f; version=129776ac2e38231fa9c02ce20e116c99de291666 <2feec5ae5df785658924ab6bd91280dc3926507c; version=129776ac2e38231fa9c02ce20e116c99de291666 <ee0180e77e6c8482644569632065411de844c515; version=129776ac2e38231fa9c02ce20e116c99de291666 <f403094d9075d7c565a3d81002b781c325cb3c07; version=6.4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.8UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.8UbuntuCVSS: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-415Double Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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