Skip to content
Fencer Vulns
critical 9.4

CVE-2026-72318 in the critical feed json

cifs: validate DFS referral string offsets

published 2026-08-15 2 mo ago modified 2026-10-16 23 d ago also EUVD-2026-59217

cvss
9.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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

cifs: validate DFS referral string offsets

parse_dfs_referrals() validates that the response header and referral array fit in the received buffer, but each referral also contains string offsets supplied by the server.

Those offsets are used to compute the DfsPath and NetworkAddress string pointers without checking whether they still point inside the response buffer. A malformed referral can therefore make the computed pointer exceed the end of the buffer. The resulting negative max_len is then passed to cifs_strndup_from_utf16(), and the non-Unicode path forwards it to kstrndup() as a size_t, allowing strnlen() to read out of bounds.

Validate each string offset before deriving the string pointer.

Patch / fix

  • Linux Linux 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
  • linux Debian 12 6.1.180-1
  • linux Debian 13 6.12.100-1
  • linux Debian 14 7.1.5-1

debian advisories DEBIAN-CVE-2026-72318

  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-34.34
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1013.13
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1013.13
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1066.74
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1007.8

ubuntu advisories UBUNTU-CVE-2026-72318

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 4.18.0-553.173.1.el8_10
  • perf RHEL 8 4.18.0-553.173.1.el8_10
  • bpftool RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.173.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.173.1.el8_10

red hat advisories RHSA-2026:82807RHSA-2026:81552RHSA-2026:81406

  • 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 AlmaLinux 8 4.18.0-553.173.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.173.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.173.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.173.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.173.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.173.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.173.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.173.1.el8_10

almalinux advisories ALSA-2026:82807ALSA-2026:81406ALSA-2026:81552

  • kernel Rocky Linux 8 4.18.0-553.173.1.el8_10
  • kernel Rocky Linux 10 6.12.0-211.65.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.57.1.el9_8

rocky linux advisories RLSA-2026:82807RLSA-2026:81406RLSA-2026:81552

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-2026-72318 updated cvss 8.1

kernel: cifs: validate DFS referral string offsets

  • Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more
    affected: workaround, no fix planned “Will not fix”
  • 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
    affected: workaround, no fix available
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.57.1.el9_8, perf 5.14.0-687.57.1.el9_8, rtla 5.14.0-687.57.1.el9_8, python3-perf 5.14.0-687.57.1.el9_8, kernel-devel-matched 5.14.0-687.57.1.el9_8, kernel-64k-devel-matched 5.14.0-687.57.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.65.1.el10_2, perf 6.12.0-211.65.1.el10_2, rtla 6.12.0-211.65.1.el10_2, python3-perf 6.12.0-211.65.1.el10_2, kernel-devel-matched 6.12.0-211.65.1.el10_2, kernel-64k-devel-matched 6.12.0-211.65.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.173.1.el8_10, kernel 4.18.0-553.173.1.el8_10, bpftool 4.18.0-553.173.1.el8_10, kernel-core 4.18.0-553.173.1.el8_10, kernel-tools 4.18.0-553.173.1.el8_10, python3-perf 4.18.0-553.173.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:82807
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.57.1.el9_8, kernel-64k 5.14.0-687.57.1.el9_8, kernel-core 5.14.0-687.57.1.el9_8, kernel-tools 5.14.0-687.57.1.el9_8, kernel-modules 5.14.0-687.57.1.el9_8, kernel-64k-core 5.14.0-687.57.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.65.1.el10_2, kernel-64k 6.12.0-211.65.1.el10_2, kernel-core 6.12.0-211.65.1.el10_2, kernel-tools 6.12.0-211.65.1.el10_2, kernel-modules 6.12.0-211.65.1.el10_2, kernel-64k-core 6.12.0-211.65.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:81406
show 9 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.57.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.57.1.el9_8
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.173.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.173.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.173.1.el8_10
    fixed: vendor fix RHSA-2026:82807
  • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.65.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.65.1.el10_2
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.57.1.el9_8, kernel-rt-64k 5.14.0-687.57.1.el9_8, kernel-rt-core 5.14.0-687.57.1.el9_8, kernel-rt-modules 5.14.0-687.57.1.el9_8, kernel-rt-64k-core 5.14.0-687.57.1.el9_8, kernel-rt-debug-core 5.14.0-687.57.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.65.1.el10_2, kernel-rt-64k 6.12.0-211.65.1.el10_2, kernel-rt-core 6.12.0-211.65.1.el10_2, kernel-rt-modules 6.12.0-211.65.1.el10_2, kernel-rt-64k-core 6.12.0-211.65.1.el10_2, kernel-rt-debug-core 6.12.0-211.65.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:81406
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.57.1.el9_8, kernel-rt-core 5.14.0-687.57.1.el9_8, kernel-rt-modules 5.14.0-687.57.1.el9_8, kernel-rt-debug-core 5.14.0-687.57.1.el9_8, kernel-rt-modules-core 5.14.0-687.57.1.el9_8, kernel-rt-debug-modules 5.14.0-687.57.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:81552
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.65.1.el10_2, kernel-rt-core 6.12.0-211.65.1.el10_2, kernel-rt-modules 6.12.0-211.65.1.el10_2, kernel-rt-debug-core 6.12.0-211.65.1.el10_2, kernel-rt-modules-core 6.12.0-211.65.1.el10_2, kernel-rt-debug-modules 6.12.0-211.65.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:81406
  • 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
    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

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Affected products

  • Linux Linux

Classification

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.