Read the docs
TI-2026-50597 Aliases CVE-2026-72318GHSA-4cv4-fc78-7hch

cifs: validate DFS referral string offsets

Priority MEDIUM 47Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · Low · High
Fix status
Partial Red Hat: 14 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00586 48th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.178, 6.6.145, 6.12.97 +3Red Hat: 3 advisoriesRed Hat: 14 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.11 and later6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2Patch availableCNA
  • Linux VendorLinux Affected 4.11 and later Fixed in 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2

Red Hat 3 advisories

  • RHSA-2026:82807 Released 2026-10-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.173.1.el8_10, kernel-4.18.0-553.173.1.el8_10, kernel-abi-stablelists-4.18.0-553.173.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.173.1.el8_10
  • RHSA-2026:81552 Released 2026-10-13 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.57.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.57.1.el9_8, kernel-64k-devel-5.14.0-687.57.1.el9_8 +12
    • 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-64k-core-5.14.0-687.57.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.57.1.el9_8, libperf-5.14.0-687.57.1.el9_8
    • 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-64k-core-5.14.0-687.57.1.el9_8 +21
    • 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-debug-5.14.0-687.57.1.el9_8 +9
  • RHSA-2026:81406 Released 2026-10-12 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.65.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.65.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.65.1.el10_2, kernel-64k-devel-6.12.0-211.65.1.el10_2 +12
    • 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-64k-core-6.12.0-211.65.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.65.1.el10_2, libperf-6.12.0-211.65.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.65.1.el10_2
    • 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-64k-core-6.12.0-211.65.1.el10_2 +21
    • 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-debug-6.12.0-211.65.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 9AffectedNo fix yet
10Base-SMTVFixed RHSA-2026:81406
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:81552
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:82807
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:81552
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:82807
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:81552
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:81552
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:81406
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:81552
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72318
  2. 2026-10-03 Alias added: GHSA-4cv4-fc78-7hch
  3. 2026-10-13 Fix available: RHSA-2026:81406 · Red Hat
  4. 2026-10-13 Fix available: RHSA-2026:81552 · Red Hat
  5. 2026-10-13 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +9 · Red Hat
  6. 2026-10-15 Fix available: RHSA-2026:82807 · Red Hat
  7. 2026-10-16 Fix available: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  8. 2026-10-16 CVSS score changed · Red Hat
  9. 2026-10-16 CISA SSVC decision points changed

References

Other 6

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences