CVE-2026-23216
kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()
Published Sep 11, 2026 · Red Hat · evidence confidence high
A use-after-free flaw was found in the Linux kernel's iSCSI target subsystem. In the iscsit_dec_conn_usage_count() function, complete() is called while still holding the conn->conn_usage_lock spinlock. The waiting thread (such as iscsit_close_connection()) may wake up immediately and free the iscsit_conn structure before the current thread executes spin_unlock_bh(), resulting in a use-after-free when attempting to release the lock on already-freed memory.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-23216 is a high public vulnerability record for Red Hat. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Red Hat is in your estate, then compare installed versions with the affected ranges. Affected version ranges have not been ingested yet. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 7.0. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: csaf. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 11, 2026 · CSAF Advisories
Detected
A use-after-free flaw was found in the Linux kernel's iSCSI target subsystem. In the iscsit_dec_conn_usage_count() function, complete() is called while still holding the conn->conn_usage_lock spinlock. The waiting thread (such as iscsit_close_connection()) may wake up immediately and free the iscsit_conn structure before the current thread executes spin_unlock_bh(), resulting in a use-after-free w
Sources
- CSAF AdvisoriesVendor advisoryRHSA-2026:9870:CVE-2026-23216
A use-after-free flaw was found in the Linux kernel's iSCSI target subsystem. In the iscsit_dec_conn_usage_count() function, complete() is called while still holding the conn->conn_usage_lock spinlock. The waiting thread (such as iscsit_close_connection()) may wake up immediately
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