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Fencer Vulns
critical 9.1

CVE-2026-46155 in the critical feed json

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

published 2026-05-28 5 mo ago modified 2026-10-19 20 d ago also EUVD-2026-32782

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1
  • linux Debian 13 6.12.88-1
  • linux Debian 14 7.0.7-1

debian advisories DEBIAN-CVE-2026-46155

  • linux Ubuntu 26.04 LTS 7.0.0-27.27
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1008.8
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1007.7
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-azure Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-raspi Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-27.27.1
  • linux-nvidia Ubuntu 26.04 LTS 7.0.0-1013.13

ubuntu advisories UBUNTU-CVE-2026-46155

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.2 6.12.0-211.31.1.el10_2
  • rv RHEL 10.2 6.12.0-211.31.1.el10_2
  • perf RHEL 10.2 6.12.0-211.31.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.31.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.31.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.31.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.31.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.31.1.el10_2

red hat advisories RHSA-2026:65708RHSA-2026:64767RHSA-2026:36541RHSA-2026:36018

  • kernel-source Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default-base Linux Micro 6.0 6.4.0-159998.55.1.159998.21.42
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.90.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.90.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1

suse advisories SUSE-SU-2026:24550-1SUSE-SU-2026:5091-1

  • kernel-source openSUSE Tumbleweed 7.0.11-1.1

opensuse advisories openSUSE-SU-2026:10954-1

  • kernel AlmaLinux 10 6.12.0-211.31.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.31.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.31.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.31.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.31.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.31.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.31.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.31.1.el10_2

almalinux advisories ALSA-2026:36541ALSA-2026:36018

  • kernel Rocky Linux 9 5.14.0-687.22.1.el9_8

rocky linux advisories RLSA-2026:36018

  • kernel Azure Linux 3.0 6.6.141.1-1

azure linux advisories AZL-88854

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-46155 updated cvss 7.1

kernel: smb/client: fix out-of-bounds read in smb2_compound_op()

  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.140.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.140.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.140.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.140.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.140.1.el9_6
    fixed: vendor fix RHSA-2026:65708
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.22.1.el9_8, perf 5.14.0-687.22.1.el9_8, rtla 5.14.0-687.22.1.el9_8, python3-perf 5.14.0-687.22.1.el9_8, kernel-devel-matched 5.14.0-687.22.1.el9_8, kernel-64k-devel-matched 5.14.0-687.22.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.31.1.el10_2, perf 6.12.0-211.31.1.el10_2, rtla 6.12.0-211.31.1.el10_2, python3-perf 6.12.0-211.31.1.el10_2, kernel-devel-matched 6.12.0-211.31.1.el10_2, kernel-64k-devel-matched 6.12.0-211.31.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:36541
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.103.1.el10_0, perf 6.12.0-55.103.1.el10_0, rtla 6.12.0-55.103.1.el10_0, python3-perf 6.12.0-55.103.1.el10_0, kernel-devel-matched 6.12.0-55.103.1.el10_0, kernel-64k-devel-matched 6.12.0-55.103.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:64767
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.140.1.el9_6, perf 5.14.0-570.140.1.el9_6, rtla 5.14.0-570.140.1.el9_6, python3-perf 5.14.0-570.140.1.el9_6, kernel-devel-matched 5.14.0-570.140.1.el9_6, kernel-64k-devel-matched 5.14.0-570.140.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:65708
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.22.1.el9_8, kernel-64k 5.14.0-687.22.1.el9_8, kernel-core 5.14.0-687.22.1.el9_8, kernel-tools 5.14.0-687.22.1.el9_8, kernel-modules 5.14.0-687.22.1.el9_8, kernel-64k-core 5.14.0-687.22.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.31.1.el10_2, kernel-64k 6.12.0-211.31.1.el10_2, kernel-core 6.12.0-211.31.1.el10_2, kernel-tools 6.12.0-211.31.1.el10_2, kernel-modules 6.12.0-211.31.1.el10_2, kernel-64k-core 6.12.0-211.31.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:36541
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.103.1.el10_0, kernel-64k 6.12.0-55.103.1.el10_0, kernel-core 6.12.0-55.103.1.el10_0, kernel-tools 6.12.0-55.103.1.el10_0, kernel-modules 6.12.0-55.103.1.el10_0, kernel-64k-core 6.12.0-55.103.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:64767
show 13 more
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.140.1.el9_6, kernel-64k 5.14.0-570.140.1.el9_6, kernel-core 5.14.0-570.140.1.el9_6, kernel-tools 5.14.0-570.140.1.el9_6, kernel-modules 5.14.0-570.140.1.el9_6, kernel-64k-core 5.14.0-570.140.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:65708
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.22.1.el9_8
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.31.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.31.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.31.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.31.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.31.1.el10_2
    fixed: vendor fix RHSA-2026:36541
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.103.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.103.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.103.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.103.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.103.1.el10_0
    fixed: vendor fix RHSA-2026:64767
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.22.1.el9_8, kernel-rt-64k 5.14.0-687.22.1.el9_8, kernel-rt-core 5.14.0-687.22.1.el9_8, kernel-rt-modules 5.14.0-687.22.1.el9_8, kernel-rt-64k-core 5.14.0-687.22.1.el9_8, kernel-rt-debug-core 5.14.0-687.22.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.31.1.el10_2, kernel-rt-64k 6.12.0-211.31.1.el10_2, kernel-rt-core 6.12.0-211.31.1.el10_2, kernel-rt-modules 6.12.0-211.31.1.el10_2, kernel-rt-64k-core 6.12.0-211.31.1.el10_2, kernel-rt-debug-core 6.12.0-211.31.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:36541
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.103.1.el10_0, kernel-rt-64k 6.12.0-55.103.1.el10_0, kernel-rt-core 6.12.0-55.103.1.el10_0, kernel-rt-modules 6.12.0-55.103.1.el10_0, kernel-rt-64k-core 6.12.0-55.103.1.el10_0, kernel-rt-debug-core 6.12.0-55.103.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:64767
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.140.1.el9_6, kernel-rt-64k 5.14.0-570.140.1.el9_6, kernel-rt-core 5.14.0-570.140.1.el9_6, kernel-rt-modules 5.14.0-570.140.1.el9_6, kernel-rt-64k-core 5.14.0-570.140.1.el9_6, kernel-rt-debug-core 5.14.0-570.140.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:65708
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.22.1.el9_8, kernel-rt-core 5.14.0-687.22.1.el9_8, kernel-rt-modules 5.14.0-687.22.1.el9_8, kernel-rt-debug-core 5.14.0-687.22.1.el9_8, kernel-rt-modules-core 5.14.0-687.22.1.el9_8, kernel-rt-debug-modules 5.14.0-687.22.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.31.1.el10_2, kernel-rt-core 6.12.0-211.31.1.el10_2, kernel-rt-modules 6.12.0-211.31.1.el10_2, kernel-rt-debug-core 6.12.0-211.31.1.el10_2, kernel-rt-modules-core 6.12.0-211.31.1.el10_2, kernel-rt-debug-modules 6.12.0-211.31.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:36541
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.103.1.el10_0, kernel-rt-kvm 6.12.0-55.103.1.el10_0, kernel-rt-core 6.12.0-55.103.1.el10_0, kernel-rt-modules 6.12.0-55.103.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.103.1.el10_0, kernel-rt-debug-core 6.12.0-55.103.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:64767
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.140.1.el9_6, kernel-rt-kvm 5.14.0-570.140.1.el9_6, kernel-rt-core 5.14.0-570.140.1.el9_6, kernel-rt-modules 5.14.0-570.140.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.140.1.el9_6, kernel-rt-debug-core 5.14.0-570.140.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:65708
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 d ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.