Vulnerability · Published May 28, 2026 · Assigned by Linux

CVE-2026-46185smb/client: fix out-of-bounds read in symlink_data()

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 45% 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 55.3% 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 symlink_data() Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-abi-stablelists6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-abi-stablelists5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-cross-headers6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-cross-headers5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-devel-matched5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-doc6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-doc5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-headers6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-headers5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
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-rt5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-tools6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-tools-libs6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools-libs5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-uki-virt6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-uki-virt5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10libperf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9libperf5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10perf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9perf5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10python3-perf6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9python3-perf5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10rtla6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9rtla5.14.0-687.44.1.el9_8ALSA-2026:63129
AlmaLinux:10rv6.12.0-211.49.1.el10_2ALSA-2026:57251
AlmaLinux:9rv5.14.0-687.44.1.el9_8ALSA-2026:63129
Debian:12linux6.1.176-1DEBIAN-CVE-2026-46185
Debian:13linux6.12.88-1DEBIAN-CVE-2026-46185
Debian:14linux7.0.7-1DEBIAN-CVE-2026-46185
Rocky Linux:10kernel0:6.12.0-211.49.1.el10_2RLSA-2026:57251
Rocky Linux:9kernel0:5.14.0-687.44.1.el9_8RLSA-2026:63129
Ubuntu:24.04:LTSlinux6.8.0-134.134UBUNTU-CVE-2026-46185
Ubuntu:25.10linux6.17.0-40.40UBUNTU-CVE-2026-46185
Ubuntu:26.04:LTSlinux7.0.0-27.27UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-aws6.8.0-1060.63UBUNTU-CVE-2026-46185
Ubuntu:25.10linux-aws6.17.0-1019.19UBUNTU-CVE-2026-46185
Ubuntu:26.04:LTSlinux-aws7.0.0-1008.8UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1019.19~24.04.1UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1060.63~22.04.1UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure6.8.0-1063.71UBUNTU-CVE-2026-46185
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-46185
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1021.21~24.04.1UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1063.71~22.04.1UBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1062.69UBUNTU-CVE-2026-46185
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-46185
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1062.69~22.04.1UBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-gcp6.8.0-1063.69UBUNTU-CVE-2026-46185
Ubuntu:25.10linux-gcp6.17.0-1020.22UBUNTU-CVE-2026-46185
Ubuntu:26.04:LTSlinux-gcp7.0.0-1007.7UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-46185
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1020.22~24.04.1UBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-46185
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1063.69~22.04.1UBUNTU-CVE-2026-46185

Affected products (as reported)

VendorProductVersions
Linux Linux 76894f3e2f71177747b8b4763fb180e800279585 – before 2be11faf79e49fb8250a181ff0b4d2b2f084af8376894f3e2f71177747b8b4763fb180e800279585 – before ef6495d4df6e7af8f3de67e65150881c880f696c76894f3e2f71177747b8b4763fb180e800279585 – before 15dc0a4de743a1aaa7b859b3aea79f08c695396c76894f3e2f71177747b8b4763fb180e800279585 – before b8c8a704f0bc133deb171f6aeb6f3a684203e21276894f3e2f71177747b8b4763fb180e800279585 – before b9561402489d41149f63e001a74384863b7b30a676894f3e2f71177747b8b4763fb180e800279585 – before d62b8d236fab503c6fec1d3e9a38bea71feaca202d046892a493d9760c35fdaefc3017f27f91b6216.0.16 – before 6.1
Linux Linux 6.1

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

References