TI-2026-52391 Aliases CVE-2026-74608 GHSA-q727-xf93-53j5

smb: client: Fix use-after-free in cifs_try_adding_channels()

MEDIUM 49Published 2026-08-22 · Updated 2026-10-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 3 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: smb: client: Fix use-after-free in cifs_try_adding_channels() cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00477 41st percentileScored 2026-11-07

Fix Partial Linux (Linux): 6.1.183, 6.6.152, 6.8 +4Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	6.1.78 to before 6.1.183; 6.6.17 to before 6.6.152; 6.7.5 to before 6.8	6.1.183, 6.6.152, 6.8	Patch available	CNA
Linux	Linux	6.8 and later	6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2	Patch available	CNA

Linux VendorLinux Affected 6.1.78 to before 6.1.183; 6.6.17 to before 6.6.152; 6.7.5 to before 6.8 Fixed in 6.1.183, 6.6.152, 6.8 Patch available CNA
Linux VendorLinux Affected 6.8 and later Fixed in 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2 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

Fix · CNA Linux (Linux) Fixed in 6.1.183, 6.6.152, 6.8
Fix · CNA Linux (Linux) Fixed in 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Enterprise Linux 8	Affected	No fix yet
Red Hat Enterprise Linux 9	Affected	No fix yet

Not affected: 3 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2026-74608
2026-10-03 Alias added: GHSA-q727-xf93-53j5
2026-10-13 EPSS moved to the below the 50th percentile
2026-10-18 CISA SSVC decision points changed
2026-10-29 Affected versions changed · Red Hat

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