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High · 8.8 CVE-2026-23193 EUVD-2026-6108GHSA-fccp-g2rw-8q2g

scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()

Published Feb 14, 2026 · Updated Oct 19, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

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.

Affected products

VendorProductAffectedFixed
Linux Linux 3.1 5.10.250

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.18.10-1 —
Debian 13 linux 6.12.73-1 DSA-6141-1
Debian 12 linux 6.1.164-1 DSA-6163-1
Debian 11 linux 5.10.251-1 DLA-4498-1
Debian 11 linux-6.1 6.1.164-1~deb11u1 DLA-4499-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1022.26 —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1095.97 —
Ubuntu 25.10 linux +8 No fix yet —
Ubuntu 24.04 LTS linux 6.8.0-117.117 USN-8278-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1055.58 USN-8278-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1056.62 USN-8278-2
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1058.65 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1058.61 USN-8278-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1054.60 USN-8278-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1041.44 USN-8278-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1055.56 USN-8278-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-117.117.1 USN-8278-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1054.57 USN-8289-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1054.57.1 USN-8289-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1024.24 USN-8296-2
Ubuntu 24.04 LTS linux-oracle 6.8.0-1054.55 —
Ubuntu 24.04 LTS linux-raspi 6.8.0-1056.60 USN-8278-1
Ubuntu 24.04 LTS linux-riscv +26 No fix yet —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1032.33 USN-8499-1
Ubuntu 22.04 LTS linux 5.15.0-185.195 USN-8493-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1111.118 USN-8493-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1057.60~22.04.1 —
Ubuntu 22.04 LTS linux-azure +1 5.15.0-1116.125 USN-8493-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1059.65~22.04.1 USN-8440-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1058.65~22.04.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1111.121 USN-8493-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1060.63~22.04.1 —
Ubuntu 22.04 LTS linux-gke 5.15.0-1107.113 USN-8493-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1094.102 USN-8493-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-124.124~22.04.1 —
Ubuntu 22.04 LTS linux-ibm 5.15.0-1105.109 USN-8493-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1055.56~22.04.1 USN-8278-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1106.112 USN-8493-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1103.108 USN-8493-1
Ubuntu 22.04 LTS linux-lowlatency 5.15.0-183.193 USN-8493-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-117.117.1~22.04.1 USN-8278-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1106.107 USN-8493-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1054.57~22.04.1 USN-8289-2
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1063.63 USN-8493-1
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1052.52 USN-8493-1
Ubuntu 22.04 LTS linux-oracle 5.15.0-1108.114 USN-8493-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1054.55~22.04.1 —
Ubuntu 22.04 LTS linux-raspi 5.15.0-1105.108 USN-8527-1
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 6.8.0-117.117~22.04.1 —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1074.78 USN-8528-1
Show 18 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2045.46 USN-8278-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1051.52 USN-8278-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 +1 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1103.105 USN-8493-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1110.119 USN-8493-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1051.52~22.04.1 USN-8278-1
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1055.58+fips1 USN-8278-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1059.65+fips1 USN-8393-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-116.116+fips1 USN-8296-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1058.61+fips1 USN-8278-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1111.118+fips1 USN-8493-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1116.125+fips1 USN-8547-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-185.195+fips1 USN-8493-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1111.121+fips1 USN-8493-1
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux +10 No fix yet —
Ubuntu Pro 20.04 LTS linux-aws-5.15 5.15.0-1111.118~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-azure-5.15 +1 5.15.0-1116.125~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-gcp-5.15 5.15.0-1111.121~20.04.1 USN-8547-1
Ubuntu Pro 20.04 LTS linux-hwe-5.15 5.15.0-185.195~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-ibm-5.15 +1 5.15.0-1105.109~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-intel-iotg-5.15 5.15.0-1106.112~20.04.1 USN-8547-1
Ubuntu Pro 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-183.193~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1063.63~20.04.1 USN-8493-1
Ubuntu Pro 20.04 LTS linux-oracle-5.15 5.15.0-1108.114~20.04.1 USN-8493-2
Ubuntu Pro 18.04 LTS linux +12 No fix yet —
Ubuntu Pro 16.04 LTS linux +7 No fix yet —
Ubuntu Pro 14.04 LTS linux +3 No fix yet —
ReleasePackageFixed inAdvisory
RHEL 10 rv +76 6.12.0-124.49.1.el10_1 RHSA-2026:6632
RHEL 9 rv +75 5.14.0-611.45.1.el9_7 RHSA-2026:6153
RHEL 8 kernel-rt +12 4.18.0-553.117.1.rt7.458.el8_10 RHSA-2026:6572
RHEL 8 perf +26 4.18.0-553.117.1.el8_10 RHSA-2026:6571
Show 14 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Rhel Extras Rt Els 7 kernel-rt +7 3.10.0-1160.148.1.rt56.1300.el7 RHSA-2026:10756
RHEL 10.0 EUS rv +77 6.12.0-55.69.1.el10_0 RHSA-2026:9095
RHEL 9.6 EUS rv +77 5.14.0-570.108.1.el9_6 RHSA-2026:9112
RHEL 9.4 EUS bpftool 7.3.0-427.121.1.el9_4 RHSA-2026:10108
RHEL 9.4 EUS rv +64 5.14.0-427.121.1.el9_4 RHSA-2026:10108
RHEL 9.2 E4S bpftool 7.0.0-284.169.1.el9_2 RHSA-2026:13734
RHEL 9.2 E4S kernel-rt +14 5.14.0-284.169.1.rt14.454.el9_2 RHSA-2026:14301
RHEL 9.2 E4S perf +47 5.14.0-284.169.1.el9_2 RHSA-2026:13734
RHEL 9.0 E4S kernel-rt +12 5.14.0-70.178.1.rt21.250.el9_0 RHSA-2026:14137
RHEL 9.0 E4S perf +28 5.14.0-70.178.1.el9_0 RHSA-2026:13936
RHEL 8.8 TUS perf +17 4.18.0-477.139.1.el8_8 RHSA-2026:13681
RHEL 8.8 E4S perf +18 4.18.0-477.139.1.el8_8 RHSA-2026:13681
RHEL 8.6 TUS perf +17 4.18.0-372.190.1.el8_6 RHSA-2026:13664
RHEL 8.6 E4S perf +25 4.18.0-372.190.1.el8_6 RHSA-2026:13664
RHEL 8.6 AUS perf +17 4.18.0-372.190.1.el8_6 RHSA-2026:13664
RHEL 8.4 EUS Long Life perf +17 4.18.0-305.190.1.el8_4 RHSA-2026:14165
RHEL 8.4 AUS perf +17 4.18.0-305.190.1.el8_4 RHSA-2026:14165
RHEL 7 ELS perf +18 3.10.0-1160.148.1.el7 RHSA-2026:9870

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 kernel-doc +1 6.12.0-124.49.1.el10_1 ALSA-2026:6632
AlmaLinux 9 rv +73 5.14.0-611.45.1.el9_7 ALSA-2026:6153
AlmaLinux 8 kernel-rt +9 4.18.0-553.117.1.rt7.458.el8_10 ALSA-2026:6572
AlmaLinux 8 perf +24 4.18.0-553.117.1.el8_10 ALSA-2026:6571

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 kernel 6.12.0-124.49.1.el10_1 RLSA-2026:6632
Rocky Linux 9 kernel 5.14.0-611.45.1.el9_7 RLSA-2026:6153
Rocky Linux 8 kernel 4.18.0-553.117.1.el8_10 RLSA-2026:6571
Rocky Linux 8 kernel-rt 4.18.0-553.117.1.rt7.458.el8_10 RLSA-2026:6572
ReleasePackageFixed inAdvisory
SLE Micro 6.2 gdk-pixbuf 2.42.12-160000.4.1 SUSE-SU-2026:21230-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.27.1.160000.2.8 SUSE-SU-2026:21237-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.28.1 SUSE-SU-2026:21237-1, SUSE-SU-2026:21230-1
SLE Micro 6.1 kernel-default-base 6.4.0-41.1.21.18 SUSE-SU-2026:21114-1
SLE Micro 6.1 kernel-rt +4 6.4.0-41.1 SUSE-SU-2026:21255-1, SUSE-SU-2026:21114-1
SLE Micro 6.0 kernel-default-base 6.4.0-41.1.21.18 SUSE-SU-2026:21123-1
SLE Micro 6.0 kernel-source +2 6.4.0-41.1 SUSE-SU-2026:21123-1
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_11 1-150700.1.3.1 SUSE-SU-2026:1573-1
SUSE Real Time Module 15 SP7 kernel-rt +1 6.4.0-150700.7.37.2 SUSE-SU-2026:1573-1
SUSE Real Time Module 15 SP7 kernel-syms-rt 6.4.0-150700.7.37.1 SUSE-SU-2026:1573-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.27.1.160000.2.8 openSUSE-SU-2026:20572-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.28.1 openSUSE-SU-2026:20572-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.73-95.123 +1 1:1.0-0.amzn2023 ALAS2023-2026-1487, ALAS2023-2026-1468
Amazon Linux 2023 perf +14 1:6.1.163-186.299.amzn2023 ALAS2023-2026-1468
Amazon Linux 2023 perf6.12 +14 1:6.12.73-95.123.amzn2023 ALAS2023-2026-1487

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.126.1-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 rv +29 6.12.0-124.49.1.el10_1 ELSA-2026-6632
Oracle Linux 9 kernel-uek +34 6.12.0-200.74.27.el10uek ELSA-2026-50372, ELSA-2026-50232, ELSA-2026-50160
Oracle Linux 9 rv +28 5.14.0-611.45.1.el9_7 ELSA-2026-6153
Oracle Linux 8 kernel-uek +17 5.15.0-318.199.3.6.el9uek ELSA-2026-50275
Oracle Linux 8 perf +19 4.18.0-553.117.1.el8_10 ELSA-2026-50275, ELSA-2026-6571
Oracle Linux 7 kernel-uek +6 5.4.17-2136.356.4.1.el8uek ELSA-2026-50299
Oracle Linux 7 kernel-uek-tools 5.4.17-2136.356.4.1.el7uek ELSA-2026-50299

Advisories 50

References