Vulnerability · Published Jul 25, 2026 · Assigned by Linux

CVE-2026-64382smb: client: fix double-free in SMB2_open() replay

High 8.8

In plain English

A high-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 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.4%top 70.7% 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_open() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_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:10kernel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-abi-stablelists6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-abi-stablelists5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-cross-headers6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-cross-headers5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-devel-matched5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-doc6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-doc5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-headers6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-headers5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:10kernel-rt6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-tools6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-tools-libs6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools-libs5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-uki-virt6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-uki-virt5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10libperf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9libperf5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10perf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9perf5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10python3-perf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9python3-perf5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10rtla6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9rtla5.14.0-687.41.1.el9_8ALSA-2026:57252
AlmaLinux:10rv6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9rv5.14.0-687.41.1.el9_8ALSA-2026:57252
Debian:13linux6.12.96-1DEBIAN-CVE-2026-64382
Debian:14linux7.1.4-1DEBIAN-CVE-2026-64382
Debian:12linux-6.126.12.100-1~deb12u1DEBIAN-CVE-2026-64382
Rocky Linux:10kernel0:6.12.0-211.49.1.el10_2RLSA-2026:57251
Rocky Linux:9kernel0:5.14.0-687.41.1.el9_8RLSA-2026:57252
Ubuntu:24.04:LTSlinux6.8.0-147.147UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux7.0.0-31.31UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux-aws7.0.0-1012.12UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-aws-7.07.0.0-1012.12~24.04.1UBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux-azure7.0.0-1014.14UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1013.13UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux-gcp7.0.0-1011.11UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74UBUNTU-CVE-2026-64382
Ubuntu:26.04:LTSlinux-gke7.0.0-1006.7UBUNTU-CVE-2026-64382
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56UBUNTU-CVE-2026-64382
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-64382

Affected products (as reported)

VendorProductVersions
Linux Linux 433042a91f9373241307725b52de573933ffedbf – before 02bc2896bdc3e29362d6e40d404006944a159c254f1fffa2376922f3d1d506e49c0fd445b023a28e – before 3196b5192f246df4272072f61a2f4a3e9967f55d4f1fffa2376922f3d1d506e49c0fd445b023a28e – before 14498ff5ce0f272ce0ef988721413e06b70389724f1fffa2376922f3d1d506e49c0fd445b023a28e – before ff2d30927bc3bf3c629f0768d2068096e64ef5ce4f1fffa2376922f3d1d506e49c0fd445b023a28e – before b55e182f2324bc6a604c21a47aa6c448f719a5326.6.32 – before 6.6.145
Linux Linux 6.8

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

References