LiveActive security incident?Get immediate response
CVE Record

CVE-2026-23021: net: usb: pegasus: fix memory leak in update_eth_regs_async()

In the Linux kernel, the following vulnerability has been resolved: net: usb: pegasus: fix memory leak in update_eth_regs_async() When asynchronously writing to the device registers and if usb_submit_urb() fail, the code fail to release allocated to this point resources.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory leak in the Pegasus USB Ethernet driver. If an asynchronous USB register write fails, allocated resources may not be released. The sources do not provide CVSS severity, confirmed exploitation, or detailed business impact, so treat it as a kernel maintenance risk rather than an emergency.

Executive priority

Handle through normal kernel patch management unless the organization relies on Pegasus USB Ethernet devices in sensitive or availability-critical environments. There is no sourced evidence of active exploitation, but kernel memory leaks can still affect reliability.

Technical view

CVE-2026-23021 affects Linux kernel pegasus USB networking code in update_eth_regs_async(). On usb_submit_urb() failure, the error path failed to free resources allocated before submission. The CVE lists affected Linux kernel versions and stable kernel commits fixing the leak across maintained branches.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions where the pegasus USB Ethernet driver is present or used. Systems without this driver or matching hardware are less likely to have practical exposure, but kernel packaging and backports must be checked.

Exploitation context

The provided sources do not show active exploitation, weaponized details, or inclusion in CISA KEV. Exploitation impact is not quantified. The bug appears tied to a USB driver failure path, so practical risk depends on local hardware, driver availability, and kernel configuration.

Researcher notes

The available record is sparse: no CVSS, CWE, exploit status, or detailed triggering conditions are provided. Analysis should focus on the pegasus driver error path around failed usb_submit_urb() calls and confirming exact stable-branch fix coverage.

Mitigation direction

  • Apply Linux kernel updates that include the referenced stable fixes.
  • Confirm distribution kernel packages have backported the pegasus fix.
  • Prioritize hosts using Pegasus USB Ethernet devices or the pegasus driver.
  • Reboot into the fixed kernel after patching.
  • Follow vendor guidance if packaged kernel status is unclear.

Validation and detection

  • Inventory Linux hosts against the affected kernel versions in the CVE record.
  • Check whether the pegasus USB Ethernet driver is installed or loaded.
  • Verify the running kernel includes a referenced fix or vendor backport.
  • Review kernel package changelogs for CVE-2026-23021 coverage.
  • Monitor affected systems for abnormal memory pressure until patched.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2026-23021 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9, 323b34963d113efb566635f43858f40cce01d5f9unaffected
LinuxLinux3.10, 0, 5.10.248, 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6, 6.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.