TI-2026-86602 Aliases CVE-2026-99278 GHSA-hwfq-rqvc-2qgh

Missing session limit per connection in Linux kernel ksmbd

LOW 38Published 2026-11-07 · Updated 2026-11-07

Key facts

Attack vector: —
Privileges required: —
User interaction: —
Attack complexity: —
Impact type: —
Confidentiality · integrity · availability: —
Fix status: Fixed

No CVSS vector from any source. Fix status from CNA.

Summary

In the Linux kernel ksmbd SMB server, from 7.2.8 before 7.3 and from 7.3, the pending session limit counts only sessions still in progress. A client that completes authentication repeatedly can retain an unbounded number of valid sessions on one connection.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

Description from the CNA

In the Linux kernel, the following vulnerability has been resolved: ksmbd: limit sessions on each connection The pending setup limit only counts InProgress sessions. A client can complete authentication repeatedly and retain an unbounded number of Valid sessions on one connection. Reserve a connection slot before allocating a session and retain a connection reference while authentication is in progress. The first SMB3 channel takes over that reservation; binding to another connection reserves one slot there. Reauthentication and authentication continuation reuse the existing reservation. Return slots on allocation or insertion failure, channel removal, and final session destruction. Accept max_sessions_per_connection in reserved startup-request space and default to 64 when older tools leave it zero. Keep the request size and existing field offsets unchanged. Expose the configured limit in procfs. The existing connection limits bound the aggregate number of sessions without a separate global session allocation limit.

Why it matters now

Fix Fixed Linux (Linux): 7.3, 7.3.2, 7.4-rc1

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	7.2.8 to before 7.3	7.3	Patch available	CNA
Linux	Linux	7.3 and later	7.3.2, 7.4-rc1	Patch available	CNA

Linux VendorLinux Affected 7.2.8 to before 7.3 Fixed in 7.3 Patch available CNA
Linux VendorLinux Affected 7.3 and later Fixed in 7.3.2, 7.4-rc1 Patch available CNA

CPE names Threatist (inferred) · 1

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

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	—	—	Linux

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

Remediation

The fixed Linux kernel versions are 7.3 for the 7.2.8 range, and 7.3.2 and 7.4-rc1 for the 7.3 range.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

Fix · CNA Linux (Linux) Fixed in 7.3
Fix · CNA Linux (Linux) Fixed in 7.3.2, 7.4-rc1

Vendor assessments

Red Hat

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

Not affected: 7 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
Red Hat OpenShift Container Platform 4
Red Hat OpenShift Container Platform 5

Timeline

2026-11-07 Threatist record created from CVE-2026-99278
2026-11-07 Alias added: GHSA-hwfq-rqvc-2qgh
2026-11-08 Affected versions changed · Red Hat
2026-11-08 CVSS score added · Red Hat

References

Other 2

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