Vulnerability · Published May 28, 2026 · Assigned by Linux

CVE-2026-46155smb/client: fix out-of-bounds read in smb2_compound_op()

Critical 9.1

In plain English

A critical-severity out-of-bounds read 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 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.5%top 58.6% 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 out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-abi-stablelists6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-abi-stablelists5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-cross-headers6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-cross-headers5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-devel-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-doc6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-doc5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-headers6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-headers5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:10kernel-rt6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-tools5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools-libs6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-tools-libs5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-uki-virt6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-uki-virt5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10libperf6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9libperf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10perf6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9perf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10python3-perf6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9python3-perf5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10rtla6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9rtla5.14.0-687.22.1.el9_8ALSA-2026:36018
AlmaLinux:10rv6.12.0-211.31.1.el10_2ALSA-2026:36541
AlmaLinux:9rv5.14.0-687.22.1.el9_8ALSA-2026:36018
Debian:13linux6.12.88-1DEBIAN-CVE-2026-46155
Debian:14linux7.0.7-1DEBIAN-CVE-2026-46155
Rocky Linux:9kernel0:5.14.0-687.22.1.el9_8RLSA-2026:36018
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux7.0.0-27.27UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux-aws7.0.0-1008.8UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-46155
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-46155
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux-gcp7.0.0-1007.7UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-46155
Ubuntu:26.04:LTSlinux-ibm7.0.0-1009.9UBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-46155
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-46155
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-46155

Affected products (as reported)

VendorProductVersions
Linux Linux 7449d736bbbd160c76b01b8fcdf72f58a8757d4b – before dffb44b2e06a2908e249f0f93156fc987eee1d1cea41367b2a602f602ea6594fc4a310520dcc64f4 – before 9b3af35645ff9cd334edc130249f9a2fb2bea25fea41367b2a602f602ea6594fc4a310520dcc64f4 – before 512d33bc8ea4ea5c19728ee118715f4b1f4d1926ea41367b2a602f602ea6594fc4a310520dcc64f4 – before a16f70a71be4b5a4eccf39a9bf09b47285f4cb7cea41367b2a602f602ea6594fc4a310520dcc64f4 – before 8d09328dfda089675e4c049f3f256064a1d1996b6.6.32 – before 6.6.140
Linux Linux 6.9

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References