CVE-2026-63821

Kernel memory leaks via ignored USB failures

Published Jul 19, 2026 · Updated Jul 19, 2026

Memory leaks in the rtw88 USB Wi-Fi driver in affected Linux Kernel releases allow attackers to consume memory after USB write failures. rtw_usb_write_data() and rtw_usb_tx_agg_skb() ignore failed URB submission, so callbacks never free socket buffers, aggregated buffers, or the transaction control block. Reachability requires rtw88 USB transmission plus a submission failure, such as device disconnect or memory pressure; no resulting crash is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory leaks in the rtw88 USB Wi-Fi driver in affected Linux Kernel releases allow attackers to consume memory after USB write failures. rtw_usb_write_data() and rtw_usb_tx_agg_skb() ignore failed URB submission, so callbacks never free socket buffers, aggregated buffers, or the transaction control block. Reachability requires rtw88 USB transmission plus a submission failure, such as device disconnect or memory pressure; no resulting crash is reported.

The record

CVE
CVE-2026-63821
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <200d58c851b8f63f77a05570072dd20f79bc3681
  3. Affected versionversion=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb
  4. Affected versionversion=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <53fed4061a09755de99c89fdc7fae5b794da455f
  5. Affected versionversion=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <6b964941bbfe6e0f18b1a5e008486dbb62df440a
  6. Affected versionversion=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <8206d173d18ef5a077423119f4e9a93cb3a6f4eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <200d58c851b8f63f77a05570072dd20f79bc3681; version=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb; version=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <53fed4061a09755de99c89fdc7fae5b794da455f; version=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <6b964941bbfe6e0f18b1a5e008486dbb62df440a; version=a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <8206d173d18ef5a077423119f4e9a93cb3a6f4eb

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo