Linux Kernel up to 6.18.9 scsi iscsit_dec_session_usage_count use after free

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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.9. It has been rated as critical. Affected is the function iscsit_dec_session_usage_count of the component scsi. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2026-23193. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.9. This affects the function iscsit_dec_session_usage_count of the component scsi. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23193 since 01/13/2026. The exploitability is told to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/05/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299090 (Linux Distros Unpatched Vulnerability : CVE-2026-23193), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70 or 6.18.10 eliminates this vulnerability. Applying the patch 2b64015550a13bcc72910be0565548d9a754d46d/fd8b0900173307039d3a84644c2fee041a7ed4fb/d8dbdc146e9e9a976931b78715be2e91299049f9/11ebafffce31efc6abeb28c509017976fc49f1ca/41b86a9ec037bd3435d68dd3692f0891a207e7e7/4530f4e4d0e6a207110b0ffed0c911bca43531a4/84dc6037390b8607c5551047d3970336cb51ba9a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (299090), EUVD (EUVD-2026-6108) and CERT Bund (WID-SEC-2026-0421). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • IBM QRadar SIEM

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299090
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23193

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.250/5.15.200/6.1.163/6.6.124/6.12.70/6.18.10
Patch: 2b64015550a13bcc72910be0565548d9a754d46d/fd8b0900173307039d3a84644c2fee041a7ed4fb/d8dbdc146e9e9a976931b78715be2e91299049f9/11ebafffce31efc6abeb28c509017976fc49f1ca/41b86a9ec037bd3435d68dd3692f0891a207e7e7/4530f4e4d0e6a207110b0ffed0c911bca43531a4/84dc6037390b8607c5551047d3970336cb51ba9a

Timelineinfo

01/13/2026 CVE reserved
02/14/2026 +32 days Advisory disclosed
02/14/2026 +0 days VulDB entry created
05/05/2026 +80 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23193 (🔒)
GCVE (CVE): GCVE-0-2026-23193
GCVE (VulDB): GCVE-100-346059
EUVD: 🔒
CERT Bund: WID-SEC-2026-0421 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 02/14/2026 18:10
Updated: 05/05/2026 22:13
Changes: 02/14/2026 18:10 (59), 02/15/2026 15:01 (2), 02/19/2026 14:44 (1), 02/20/2026 05:54 (1), 03/19/2026 21:00 (11), 05/05/2026 22:13 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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