Log in Start free

Vulnerability · Published Sep 11, 2026 · Assigned by Linux

CVE-2026-89636smb: client: clear ce->tgthint in free_tgts()

Critical 9.8

In plain English

A critical-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 48.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all structures in ce->tlist, ce->tgthint is left pointing to one of the freed cache_dfs_tgt structures. If ce->tgthint is not reset before it is used later, it results in a use-after-free. Set ce->tgthint to NULL in free_tgts() after the elements are freed to reflect that no elements remain.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.190-1DEBIAN-CVE-2026-89636
Debian:13linux6.12.111-1DEBIAN-CVE-2026-89636
Debian:14linux7.2.6-1DEBIAN-CVE-2026-89636
Debian:12linux-6.126.12.111-1~deb12u1DEBIAN-CVE-2026-89636
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1038.42UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89636
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-89636
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-89636
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-89636

Affected products (as reported)

VendorProductVersions
Linux Linux 54be1f6c1c37498bba557049df646cc239fa37e3 – before 14f60e959b5ac813715ff72e127beb3584ddabf654be1f6c1c37498bba557049df646cc239fa37e3 – before 3ff9462bb7a06d8d32a1dc02d39580b078ec9e5554be1f6c1c37498bba557049df646cc239fa37e3 – before 7507bd1885643d0461a6017767492450af1ce2a354be1f6c1c37498bba557049df646cc239fa37e3 – before 9ab46a13798a61d9d020b01d4e57efdabe6624fa54be1f6c1c37498bba557049df646cc239fa37e3 – before 5baab40404a9393bcc0b7b8f1950bf2c307e098454be1f6c1c37498bba557049df646cc239fa37e3 – before b1b741cf8e7ce1b91d937e23decd3d3358748700
Linux Linux 5.0

References