CVE-2026-64338

System crash via stale parport registration

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux kernel uss720 USB parallel-port driver allows local users to crash the system via a failing adapter probe. In uss720_probe(), a failed get_1284_register() call frees driver-private memory without unregistering the previously registered parport, leaving pp->private_data dangling. Triggering the failure requires local access to probe a USB parallel-port adapter; later parport use can dereference freed memory and crash the system.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel uss720 USB parallel-port driver allows local users to crash the system via a failing adapter probe. In uss720_probe(), a failed get_1284_register() call frees driver-private memory without unregistering the previously registered parport, leaving pp->private_data dangling. Triggering the failure requires local access to probe a USB parallel-port adapter; later parport use can dereference freed memory and crash the system.

The record

CVE
CVE-2026-64338
Published
Jul 25, 2026
Updated
Jul 25, 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 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=02d13616ca30014ed96302e51a5b0e17664e58bc
  2. Affected versionversion=04736c1bc32197f7d859e01a96ae80a16659931d <6bbb98bec71b577fda4f4b48f7aea5874b04a576
  3. Affected versionversion=10132ccf99f49b43aeb7470df50d72344a601ad6 <0b3073f40cc9f95d5ff0037eb0a06f5c1725a7ea
  4. Affected versionversion=3295f1b866bfbcabd625511968e8a5c541f9ab32 <48dd0b2ec9f2e97c486eb68cd0a64b25c1c3df3e
  5. Affected versionversion=3295f1b866bfbcabd625511968e8a5c541f9ab32 <5e62d7857fd51b908b8371062ee839739a086bbe
  6. Affected versionversion=3295f1b866bfbcabd625511968e8a5c541f9ab32 <729b68a5bad71220ae0914c8bdab9488ad5be6c8
  7. Affected versionversion=3295f1b866bfbcabd625511968e8a5c541f9ab32 <b4ecbdc4f8830f5586c4a5cfc384c00f20f8f8b3
  8. Affected versionversion=4.19.317 <4.20
  9. Affected versionversion=489d77fbd66375972a380d207f7eb39b00c4a67b
  10. Affected versionversion=4eaf2331a77996bbbaf2b824d452ac8ebda7e6e7 <93563243377f8e9b46cc94d9c4f06533dd31b141
  11. Affected versionversion=5.10.221 <5.10.261
  12. Affected versionversion=5.15.162 <5.15.212
  13. Affected versionversion=5.4.279 <5.5
  14. Affected versionversion=6.10
  15. Affected versionversion=6.1.96 <6.1.178
  16. Affected versionversion=6.6.36 <6.6.145
  17. Affected versionversion=6.9.7 <6.10
  18. Affected versionversion=8fc246a8a456679993df565d3c9e3da28030ee43 <1712fd71a5aaf81e47c747f180535fa963ad7830
  19. Affected versionversion=dff3b01e91a3df93063b03d0f8dd5c40546687ec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=02d13616ca30014ed96302e51a5b0e17664e58bc; version=04736c1bc32197f7d859e01a96ae80a16659931d <6bbb98bec71b577fda4f4b48f7aea5874b04a576; version=10132ccf99f49b43aeb7470df50d72344a601ad6 <0b3073f40cc9f95d5ff0037eb0a06f5c1725a7ea; version=3295f1b866bfbcabd625511968e8a5c541f9ab32 <48dd0b2ec9f2e97c486eb68cd0a64b25c1c3df3e; version=3295f1b866bfbcabd625511968e8a5c541f9ab32 <5e62d7857fd51b908b8371062ee839739a086bbe; version=3295f1b866bfbcabd625511968e8a5c541f9ab32 <729b68a5bad71220ae0914c8bdab9488ad5be6c8; version=3295f1b866bfbcabd625511968e8a5c541f9ab32 <b4ecbdc4f8830f5586c4a5cfc384c00f20f8f8b3; version=4.19.317 <4.20; version=489d77fbd66375972a380d207f7eb39b00c4a67b; version=4eaf2331a77996bbbaf2b824d452ac8ebda7e6e7 <93563243377f8e9b46cc94d9c4f06533dd31b141; version=5.10.221 <5.10.261; version=5.15.162 <5.15.212; version=5.4.279 <5.5; version=6.10; version=6.1.96 <6.1.178; version=6.6.36 <6.6.145; version=6.9.7 <6.10; version=8fc246a8a456679993df565d3c9e3da28030ee43 <1712fd71a5aaf81e47c747f180535fa963ad7830; version=dff3b01e91a3df93063b03d0f8dd5c40546687ec

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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