Use-after-free via missing SRCU grace period
Published Sep 16, 2026 · Updated Sep 16, 2026
Use-after-free in the NVMe namespace allocation error path in Linux allows attackers to cause unspecified impact via a race. The out_unlink_ns path removes the namespace from its sibling list and frees it without waiting for multipath SRCU readers that can still retain a reference. Reachability requires an allocation failure concurrent with multipath path lookup or revalidation; the published record does not specify the resulting impact or attacker privileges.
Summary
What happened
Use-after-free in the NVMe namespace allocation error path in Linux allows attackers to cause unspecified impact via a race. The out_unlink_ns path removes the namespace from its sibling list and frees it without waiting for multipath SRCU readers that can still retain a reference. Reachability requires an allocation failure concurrent with multipath path lookup or revalidation; the published record does not specify the resulting impact or attacker privileges.
The record
- CVE
- CVE-2026-89972
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=4.15
- Affected versionversion=ed754e5deeb17f4e675c84e4b6c640cc7344e498 <76023560d60f10b4f808941163aa2975f1631683
- Affected versionversion=ed754e5deeb17f4e675c84e4b6c640cc7344e498 <d663944dbad81bb0e3635d7090db4713e6300858
- Affected versionversion=ed754e5deeb17f4e675c84e4b6c640cc7344e498 <ef248d5de4469fb6bbaf8dbe0c4c47800080d648
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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