TI-2026-48210 Aliases CVE-2026-68431 GHSA-6pm5-g7cv-g948

ksmbd: validate minimum PDU size for transform requests

LOW 39Published 2026-08-12 · Updated 2026-08-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · None · High
Fix status: Partial Red Hat: 2 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: ksmbd: validate minimum PDU size for transform requests The receive path applies the minimum SMB2 PDU size check only when ProtocolId is SMB2_PROTO_NUMBER. A packet carrying SMB2_TRANSFORM_PROTO_NUM bypasses the check even when the negotiated dialect does not provide transform handling. On an SMB 2.1 connection, a short transform packet therefore reaches init_smb2_rsp_hdr(), which interprets the request as a full SMB2 header and reads beyond the request allocation. The copied fields can then be returned to the unauthenticated client. Compression transforms are converted to ordinary SMB2 messages before protocol validation. After that conversion, validate ordinary SMB2 requests against SMB2_MIN_SUPPORTED_PDU_SIZE and require encryption transform requests to contain both a transform header and an SMB2 header. This rejects truncated requests before work allocation.

Why it matters now

EPSS 0.00366 30th percentileScored 2026-11-07

Fix Partial Linux (Linux): 5.15.217, 6.1.184, 6.4 +5Red Hat: 2 without a fix

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	5.15.145 to before 5.15.217; 6.1.34 to before 6.1.184; 6.3.8 to before 6.4	5.15.217, 6.1.184, 6.4	Patch available	CNA
Linux	Linux	6.4 and later	5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.46, 7.1.6, 7.2	Patch available	CNA

Linux VendorLinux Affected 5.15.145 to before 5.15.217; 6.1.34 to before 6.1.184; 6.3.8 to before 6.4 Fixed in 5.15.217, 6.1.184, 6.4 Patch available CNA
Linux VendorLinux Affected 6.4 and later Fixed in 5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.46, 7.1.6, 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 5.15.217, 6.1.184, 6.4
Fix · CNA Linux (Linux) Fixed in 5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.46, 7.1.6, 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 for NVIDIA 26	Affected	No fix planned: Out of support scope

Not affected: 6 products

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

2026-10-02 Threatist record created from CVE-2026-68431
2026-10-03 Alias added: GHSA-6pm5-g7cv-g948
2026-10-14 Priority changed: MEDIUM → LOW
2026-11-06 Affected versions changed · Red Hat

References

Other 7

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