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Vulnerability · Published Jul 25, 2026 · Assigned by Linux

CVE-2026-64385smb: client: fix double-free in SMB2_ioctl() replay

Critical 9.8

In plain English

A critical-severity double free 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 40% 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 60.2% 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: smb: client: fix double-free in SMB2_ioctl() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_ioctl_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-abi-stablelists6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-cross-headers6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-devel-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-doc6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-headers6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-tools6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-tools-libs6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-uki-virt6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10libperf6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10perf6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10python3-perf6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10rtla6.12.0-211.65.1.el10_2ALSA-2026:81406
AlmaLinux:10rv6.12.0-211.65.1.el10_2ALSA-2026:81406
Debian:13linux6.12.96-1DEBIAN-CVE-2026-64385
Debian:14linux7.1.4-1DEBIAN-CVE-2026-64385
Debian:12linux-6.126.12.100-1~deb12u1DEBIAN-CVE-2026-64385
Rocky Linux:10kernel0:6.12.0-211.65.1.el10_2RLSA-2026:81406
Ubuntu:24.04:LTSlinux6.8.0-147.147UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux7.0.0-31.31UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-aws7.0.0-1012.12UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-aws-7.07.0.0-1012.12~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-azure7.0.0-1014.14UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1013.13UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-gcp7.0.0-1011.11UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-gke7.0.0-1006.7UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-31.31~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-ibm7.0.0-1013.13UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1018.18UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1018.18~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2018.18UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1013.13UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67UBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-oracle7.0.0-1011.11UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-raspi7.0.0-1019.19UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-realtime7.0.0-31.31.1UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-64385
Ubuntu:26.04:LTSlinux-riscv7.0.0-31.31.1UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-31.31.1~24.04.1UBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-64385
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-64385
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-64385

Affected products (as reported)

VendorProductVersions
Linux Linux 433042a91f9373241307725b52de573933ffedbf – before 0be4bc64882edaefaaee8d1e27d083643eb778e64f1fffa2376922f3d1d506e49c0fd445b023a28e – before 96fcfc8ae7359346156e492ca610e830d2649ad64f1fffa2376922f3d1d506e49c0fd445b023a28e – before 276c8efbc49f9303ac76d0d4deab7128581b0f3b4f1fffa2376922f3d1d506e49c0fd445b023a28e – before fc65ffb4ef1bf540da16b17c225ae51091e07d724f1fffa2376922f3d1d506e49c0fd445b023a28e – before f9bbadb6c94583e3b4af1afc449bfceb1d1ddec96.6.32 – before 6.6.145
Linux Linux 6.8

Weakness: CWE-415 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References