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Vulnerability · Published Dec 9, 2025 · Assigned by Linux

CVE-2023-53794cifs: fix session state check in reconnect to avoid use-after-free issue

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 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 56.2% 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: cifs: fix session state check in reconnect to avoid use-after-free issue Don't collect exiting session in smb2_reconnect_server(), because it will be released soon. Note that the exiting session will stay in server->smb_ses_list until it complete the cifs_free_ipc() and logoff() and then delete itself from the list.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.52-1DEBIAN-CVE-2023-53794
Debian:13linux6.4.13-1DEBIAN-CVE-2023-53794
Debian:14linux6.4.13-1DEBIAN-CVE-2023-53794
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-53794
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2023-53794

Affected products (as reported)

VendorProductVersions
Linux Linux 4fcd1813e6404dd4420c7d12fb483f9320f0bf93 – before 7e4f5c3f01fb0e51ca438e43262d858daf9a0a764fcd1813e6404dd4420c7d12fb483f9320f0bf93 – before 759ffc164d95a32c09528766d74d9b4fb054e8f44fcd1813e6404dd4420c7d12fb483f9320f0bf93 – before 99f280700b4cc02d5f141b8d15f8e9fad0418f65655e0c067f0e02ece03fd0591dabe3db2ae27552875cc09c0767a4ac06b57af383709657f98b3ea1599fe1409085059ba12a2c3897c853be9fa9e7cf2e4378ee60049b752c9dce16f62ce6fbd11b379a59b520454b323ec43b2ae757217332cea33091e0
Linux Linux 4.7

References