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Vulnerability record · CVE-2026-23193 · published 14 February 2026

CVE-2026-23193: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() In iscsit_dec_session_usage_count(), the function calls complete() while holding the sess->session_usage_lock. Similar to the connection usage count logic, the waiter signaled by complete() (e.g., in the session release path) may wake up and free the iscsit_session structure immediately. This creates a race condition where the current thread may attempt to execute spin_unlock_bh() on a session structure that has already been deallocated, resulting in a KASAN slab-use-after-free. To resolve this, release the session_usage_lock before calling complete() to ensure all dereferences of the sess pointer are finished before the waiter is allowed to proceed with deallocation.

7.8 CVSS 3.1 High EPSS 0.25% · top 85.4% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() In iscsit_dec_session_usage_count(), the function calls complete() while holding the sess->session_usage_lock. Similar to the connection usage count logic, the waiter signaled by complete() (e.g., in the session release path) may wake up and free the iscsit_session structure immediately. This creates a race condition where the current thread may attempt to execute spin_unlock_bh() on a session structure that has already been deallocated, resulting in a KASAN slab-use-after-free. To resolve this, release the session_usage_lock before calling complete() to ensure all dereferences of the sess pointer are finished before the waiter is allowed to proceed with deallocation.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/11ebafffce31efc6abeb28c509017976fc49f1ca Patch
https://git.kernel.org/stable/c/2b64015550a13bcc72910be0565548d9a754d46d Patch
https://git.kernel.org/stable/c/41b86a9ec037bd3435d68dd3692f0891a207e7e7 Patch
https://git.kernel.org/stable/c/4530f4e4d0e6a207110b0ffed0c911bca43531a4 Patch
https://git.kernel.org/stable/c/84dc6037390b8607c5551047d3970336cb51ba9a Patch
https://git.kernel.org/stable/c/d8dbdc146e9e9a976931b78715be2e91299049f9 Patch
https://git.kernel.org/stable/c/fd8b0900173307039d3a84644c2fee041a7ed4fb Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23193), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.