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TI-2026-18663 Aliases CVE-2026-23226GHSA-5jgq-pv8m-5cx7

ksmbd: add chann_lock to protect ksmbd_chann_list xarray

Priority LOW 39CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add chann_lock to protect ksmbd_chann_list xarray ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del). Adds rw_semaphore chann_lock to struct ksmbd_session and protects all xa_load/xa_store/xa_erase accesses.

Why it matters now

EPSS 0.00505 43rd percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.191, 5.16, 6.3 +5

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.1.29 to before 6.1.191; 5.15.145 to before 5.16; 6.2.16 to before 6.36.1.191, 5.16, 6.3Patch availableCNA
LinuxLinux6.3 and later6.1.191, 6.6.160, 6.12.77, 6.18.11, 6.19.1, 7.0Patch availableCNA
  • Linux VendorLinux Affected 6.1.29 to before 6.1.191; 5.15.145 to before 5.16; 6.2.16 to before 6.3 Fixed in 6.1.191, 5.16, 6.3 Patch available CNA
  • Linux VendorLinux Affected 6.3 and later Fixed in 6.1.191, 6.6.160, 6.12.77, 6.18.11, 6.19.1, 7.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.3 to before 6.18.11; 6.19 to before 6.19.1VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.3 to before 6.18.11; 6.19 to before 6.19.1 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 5.16, 6.3
  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.77, 6.18.11, 6.19.1, 7.0

Vendor assessments

Red Hat

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

Not affected: 5 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23226
  2. 2026-10-03 Alias added: GHSA-5jgq-pv8m-5cx7
  3. 2026-10-21 Fix available: Linux/Linux@43ad494ac6e940a8eabf25d5bd77bb3bb53b1153, Linux/[email protected] · CNA
  4. 2026-10-21 1 new reference · CNA
  5. 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@c00f3938f7ac52770907768e440cf253af9cbb63 · CNA
  6. 2026-10-30 1 new reference · CNA

References

Patch 3

Other 3

  • 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-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
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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