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TI-2026-68066 Aliases CVE-2026-98175GHSA-22vf-w84m-jw7w

Use-after-free in Linux kernel SMB client reconnect work

Priority LOW 33Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 5 without a fix

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

Summary

The Linux kernel SMB client is affected in multiple stable branches starting at 3.10.107 and in releases from 4.10 onward. When the demultiplex thread exits, clean_demultiplex_info() cancels the echo work but not the queued reconnect work, so the reconnect can run after the server structure is freed, causing a use-after-free. A remote attacker without privileges can trigger it with high complexity and user interaction, with high impact on confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

In the Linux kernel, the following vulnerability has been resolved: smb: client: cancel reconnect work in clean_demultiplex_info() clean_demultiplex_info() cancels server->echo delayed work but not server->reconnect, which can cause a use-after-free when the demultiplex thread exits while a reconnect work is still queued: cifs_demultiplex_thread() cifs_readv_from_socket() cifs_reconnect() __cifs_reconnect() cifs_queue_server_reconn() mod_delayed_work(cifsiod_wq, &server->reconnect, 0) clean_demultiplex_info() cancel_delayed_work_sync(&server->echo) // echo canceled // reconnect NOT canceled kfree_sensitive(server) // server freed ...later, on cifsiod_wq: smb2_reconnect_server() server->srv_count // UAF read of freed server Fix this by canceling server->reconnect delayed work in clean_demultiplex_info() before the server is freed, the same way cifs_put_tcp_session() already does.

Why it matters now

EPSS 0.00321 25th percentileScored 2026-11-07
Fix Partial Linux (Linux): 3.11, 3.13, 3.17 +10Red Hat: 5 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.10.107 to before 3.11; 3.12.70 to before 3.13; 3.16.42 to before 3.17; 3.18.47 to before 3.19; 4.1.38 to before 4.2; 4.4.40 to before 4.5; 4.8.16 to before 4.9; 4.9.1 to before 4.103.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9, 4.10Patch availableCNA
LinuxLinux4.10 and later6.6.158, 6.12.112, 6.18.54, 7.2.8, 7.3Patch availableCNA
  • Linux VendorLinux Affected 3.10.107 to before 3.11; 3.12.70 to before 3.13; 3.16.42 to before 3.17; 3.18.47 to before 3.19; 4.1.38 to before 4.2; 4.4.40 to before 4.5; 4.8.16 to before 4.9; 4.9.1 to before 4.10 Fixed in 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9, 4.10 Patch available CNA
  • Linux VendorLinux Affected 4.10 and later Fixed in 6.6.158, 6.12.112, 6.18.54, 7.2.8, 7.3 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

Upgrade the Linux kernel to 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3, or to the stable branch releases 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9 or 4.10. Red Hat Enterprise Linux 8, 9 and 10 and Red Hat OpenShift Container Platform 4 and 5 are affected, with no fix plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA Linux (Linux) Fixed in 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9, 4.10
  • Fix · CNA Linux (Linux) Fixed in 6.6.158, 6.12.112, 6.18.54, 7.2.8, 7.3

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-98175
  2. 2026-10-06 Alias added: GHSA-22vf-w84m-jw7w
  3. 2026-10-07 CVSS score added · CNA
  4. 2026-10-09 Affected versions changed · Red Hat
  5. 2026-10-09 CVSS score added · Red Hat
  6. 2026-10-19 Fix available: Linux/[email protected] · CNA
  7. 2026-10-27 CVSS score changed · Red Hat
  8. 2026-11-04 Affected versions changed · Red Hat

References

Other 5

  • 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