Local service interruption via ring-buffer memory leak
Published Jul 25, 2026 · Updated Jul 25, 2026
Memory leak in Linux Kernel 6.16 allows local users to exhaust system memory by repeatedly obtaining xHCI sideband ring buffers. The xhci_ring_to_sgtable() success path returns a completed scatter-gather table without freeing the temporary pages array used to construct it. Reaching the leak requires low-privileged local access to a sideband client that can request endpoint or event ring buffers, and repeated requests can interrupt service through memory exhaustion.
Summary
What happened
Memory leak in Linux Kernel 6.16 allows local users to exhaust system memory by repeatedly obtaining xHCI sideband ring buffers. The xhci_ring_to_sgtable() success path returns a completed scatter-gather table without freeing the temporary pages array used to construct it. Reaching the leak requires low-privileged local access to a sideband client that can request endpoint or event ring buffers, and repeated requests can interrupt service through memory exhaustion.
The record
- CVE
- CVE-2026-64464
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=6.16
- Affected versionversion=de66754e9f8029f8ae955a588959b99cab56b506 <49f6e3c3ef19f04f6657ed8dce550e36c763abb8
- Affected versionversion=de66754e9f8029f8ae955a588959b99cab56b506 <99d00a9e35e311a91d258029d5bb584377296c34
- Affected versionversion=de66754e9f8029f8ae955a588959b99cab56b506 <a3eaf82ff842d6ca95937ea584417e04828235a6
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
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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