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Fencer Vulns
critical 9.1

CVE-2026-68343 in the critical feed json

smb: client: validate DFS referral PathConsumed

published 2026-08-10 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-55444

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 43%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

smb: client: validate DFS referral PathConsumed

parse_dfs_referrals() validates that the response contains the fixed referral entry array and, on for-next, the per-referral string offsets. However, the response also contains a PathConsumed value that is later used for DFS path parsing.

If a malformed response provides a PathConsumed value larger than the search name, later DFS parsing can advance beyond the end of the path.

Validate PathConsumed against the search name length before storing it in the parsed referral.

Patch / fix

  • Linux Linux 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.101-1
  • linux Debian 14 7.1.6-1
  • linux-6.12 Debian 12 6.12.101-1~deb12u1

debian advisories DEBIAN-CVE-2026-68343

  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-38.38
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1066.74
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1008.9

ubuntu advisories UBUNTU-CVE-2026-68343

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 8 4.18.0-553.160.1.el8_10
  • perf RHEL 8 4.18.0-553.160.1.el8_10
  • bpftool RHEL 8 4.18.0-553.160.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.160.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.160.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.160.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.160.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.160.1.el8_10

red hat advisories RHSA-2026:66000RHSA-2026:64770RHSA-2026:57252

  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.39.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.39.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.39.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.39.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.39.1.160000.2.26
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.39.1
  • kernel-azure SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.39.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.39.1

suse advisories SUSE-SU-2026:4687-1SUSE-SU-2026:24197-1SUSE-SU-2026:24184-1SUSE-SU-2026:24235-1SUSE-SU-2026:24179-1SUSE-SU-2026:4254-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.39.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.39.1

opensuse advisories openSUSE-SU-2026:22091-1

  • kernel AlmaLinux 8 4.18.0-553.160.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.160.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.160.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.160.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.160.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.160.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.160.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.160.1.el8_10

almalinux advisories ALSA-2026:66000ALSA-2026:64770ALSA-2026:57252

  • kernel-rt Rocky Linux 8 4.18.0-553.160.1.rt7.501.el8_10
  • kernel Rocky Linux 9 5.14.0-687.41.1.el9_8

rocky linux advisories RLSA-2026:64770RLSA-2026:57252

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-2026-68343 updated cvss 6.2

kernel: smb: client: validate DFS referral PathConsumed

  • 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 Red Hat Enterprise Linux 10 kernel 6.12.0-257.el10 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.41.1.el9_8, perf 5.14.0-687.41.1.el9_8, rtla 5.14.0-687.41.1.el9_8, python3-perf 5.14.0-687.41.1.el9_8, kernel-devel-matched 5.14.0-687.41.1.el9_8, kernel-64k-devel-matched 5.14.0-687.41.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.160.1.el8_10, kernel 4.18.0-553.160.1.el8_10, bpftool 4.18.0-553.160.1.el8_10, kernel-core 4.18.0-553.160.1.el8_10, kernel-tools 4.18.0-553.160.1.el8_10, python3-perf 4.18.0-553.160.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:66000
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.41.1.el9_8, kernel-64k 5.14.0-687.41.1.el9_8, kernel-core 5.14.0-687.41.1.el9_8, kernel-tools 5.14.0-687.41.1.el9_8, kernel-modules 5.14.0-687.41.1.el9_8, kernel-64k-core 5.14.0-687.41.1.el9_8, +27 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.41.1.el9_8
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.160.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.160.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.160.1.el8_10
    fixed: vendor fix RHSA-2026:66000
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-kvm 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-core 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-modules 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-debug-kvm 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-debug-core 4.18.0-553.160.1.rt7.501.el8_10, +4 more
    fixed: vendor fix RHSA-2026:64770
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.41.1.el9_8, kernel-rt-64k 5.14.0-687.41.1.el9_8, kernel-rt-core 5.14.0-687.41.1.el9_8, kernel-rt-modules 5.14.0-687.41.1.el9_8, kernel-rt-64k-core 5.14.0-687.41.1.el9_8, kernel-rt-debug-core 5.14.0-687.41.1.el9_8, +14 more Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.41.1.el9_8, kernel-rt-core 5.14.0-687.41.1.el9_8, kernel-rt-modules 5.14.0-687.41.1.el9_8, kernel-rt-debug-core 5.14.0-687.41.1.el9_8, kernel-rt-modules-core 5.14.0-687.41.1.el9_8, kernel-rt-debug-modules 5.14.0-687.41.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-core 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-modules 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-debug-core 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-debug-modules 4.18.0-553.160.1.rt7.501.el8_10, kernel-rt-modules-extra 4.18.0-553.160.1.rt7.501.el8_10, +2 more
    fixed: vendor fix RHSA-2026:64770
show 2 more
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202608251819
    fixed: vendor fix RHSA-2026:60440
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +2 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +9 more Red Hat Enterprise Linux for NVIDIA 26 kernel 6.12.0-257.el10 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    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

0.51% chance of exploitation in the next 30 days, higher than 43% 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.