---
id: CVE-2026-23193
title: 'scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()'
summary: |-
  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->…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    2b64015550a13bcc72910be0565548d9a754d46d
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    fd8b0900173307039d3a84644c2fee041a7ed4fb
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    d8dbdc146e9e9a976931b78715be2e91299049f9
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    11ebafffce31efc6abeb28c509017976fc49f1ca
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    41b86a9ec037bd3435d68dd3692f0891a207e7e7
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    4530f4e4d0e6a207110b0ffed0c911bca43531a4
  - >-
    Linux >= e48354ce078c079996f89d715dfa44814b4eba01 <
    84dc6037390b8607c5551047d3970336cb51ba9a
  - Linux 3.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-16T20:19:30.330319Z'
published: '2026-02-14'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:25:34.873Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23193'
references:
  - url: 'https://git.kernel.org/stable/c/2b64015550a13bcc72910be0565548d9a754d46d'
  - url: 'https://git.kernel.org/stable/c/fd8b0900173307039d3a84644c2fee041a7ed4fb'
  - url: 'https://git.kernel.org/stable/c/d8dbdc146e9e9a976931b78715be2e91299049f9'
  - url: 'https://git.kernel.org/stable/c/11ebafffce31efc6abeb28c509017976fc49f1ca'
  - url: 'https://git.kernel.org/stable/c/41b86a9ec037bd3435d68dd3692f0891a207e7e7'
  - url: 'https://git.kernel.org/stable/c/4530f4e4d0e6a207110b0ffed0c911bca43531a4'
  - url: 'https://git.kernel.org/stable/c/84dc6037390b8607c5551047d3970336cb51ba9a'
tags:
  - cve.org
epss: 0.00282
epssPercentile: 0.19414
ingestedAt: '2026-10-19T18:35:50.096Z'
---

## Overview

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.

## Affected

- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 2b64015550a13bcc72910be0565548d9a754d46d`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < fd8b0900173307039d3a84644c2fee041a7ed4fb`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < d8dbdc146e9e9a976931b78715be2e91299049f9`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 11ebafffce31efc6abeb28c509017976fc49f1ca`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 41b86a9ec037bd3435d68dd3692f0891a207e7e7`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 4530f4e4d0e6a207110b0ffed0c911bca43531a4`
- `Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 84dc6037390b8607c5551047d3970336cb51ba9a`
- `Linux 3.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.