Linux Kernel up to 7.2-rc2 USB iso_stream_schedule hcpriv memory leak

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k3.18-

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.2-rc2 and classified as very critical. Affected by this vulnerability is the function iso_stream_schedule of the component USB. The manipulation of the argument hcpriv leads to memory leak. This vulnerability is documented as CVE-2026-64348. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.2-rc2. This issue affects the function iso_stream_schedule of the component USB. The manipulation of the argument hcpriv with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: free iso schedules on failed submit EHCI and FOTG210 isochronous submits build an ehci_iso_sched before linking the URB to the endpoint queue, and keep the staged schedule in urb->hcpriv until iso_stream_schedule() and the link helpers consume it. If the controller is no longer accessible, or usb_hcd_link_urb_to_ep() fails, submit jumps to done_not_linked before that handoff happens and leaks the staged schedule still attached to urb->hcpriv. Free the staged schedule from done_not_linked when submit fails before the URB is linked and clear urb->hcpriv after the free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1.1. An x86_64 allyesconfig build showed no new warnings. As we do not have an EHCI host controller with a USB isochronous device to test with, no runtime testing was able to be performed.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-64348 since 07/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/25/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 5.10.261, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc3 eliminates this vulnerability. Applying the patch b0d00d077f9738d215af9b50c74dffab7a1de19f/be5004395dfd0b6ec310db359f887fa396fd0dd2/8890699eea19027ef6e4f9cbcf27cba5e789793f/6bc17a78a05671d303820224fb37ca339c1dc2cb/4bb88aee6b868cbf73bf453f62497802f5fe4769/b9399d25fbb34a05bbe76eeedd730f62ff2670e9 is able to eliminate this problem.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc3
Patch: b0d00d077f9738d215af9b50c74dffab7a1de19f/be5004395dfd0b6ec310db359f887fa396fd0dd2/8890699eea19027ef6e4f9cbcf27cba5e789793f/6bc17a78a05671d303820224fb37ca339c1dc2cb/4bb88aee6b868cbf73bf453f62497802f5fe4769/b9399d25fbb34a05bbe76eeedd730f62ff2670e9

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64348 (🔒)
GCVE (CVE): GCVE-0-2026-64348
GCVE (VulDB): GCVE-100-383141

Entryinfo

Created: 07/25/2026 16:29
Changes: 07/25/2026 16:29 (60)
Complete: 🔍
Cache ID: 216::103

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