TI-2026-86601 Aliases CVE-2026-99277 GHSA-p59r-fqh3-3h8x

Connection freed while in use in Linux kernel ksmbd session channels

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

The ksmbd server in the Linux kernel does not hold a connection reference for each session channel. A session that has been unregistered can still be used by another reference holder, so the connection can be freed while it is still in use, for example during SMB3.1.1 binding or a procfs read. Linux kernel versions from 7.2.8 before 7.3 and from 7.3 are affected.

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: hold a connection reference for each session channel ksmbd_session_unregister() removes a session from the global and per- connection tables before dropping the table reference. A concurrent reference holder can keep the session and its channel list alive after those removals. Connection cleanup can no longer find the unpublished session to remove its channels. Since a channel only stores a raw conn pointer, the connection can be freed while another session reference holder is still accessing it, for example during SMB3.1.1 binding or a procfs read. Take a connection reference when registering a channel and release it on insertion failure, channel removal, or final session destruction. Keep the channels and signing keys until the session is destroyed so a response can still be signed after the session has been unregistered.

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

Upgrade the Linux kernel to 7.3, 7.3.2 or 7.4-rc1, which contain the fix.

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-2026-99277
2026-11-07 Alias added: GHSA-p59r-fqh3-3h8x
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