TI-2026-63165 Aliases CVE-2026-93811 GHSA-47cf-52hv-jjq9

ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

LOW 22Published 2026-09-24 · Updated 2026-10-03

Key facts

Attack vector: —
Privileges required: —
User interaction: —
Attack complexity: —
Impact type: —
Confidentiality · integrity · availability: —
Fix status: Partial Red Hat: 1 without a fix

No CVSS vector from any source. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling 1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths. 2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.

Why it matters now

EPSS 0.00173 6th percentileScored 2026-11-07

Fix Partial Linux (Linux): 5.15.222, 5.19, 5.20 +5Red Hat: 1 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	5.15.62 to before 5.15.222; 5.18.18 to before 5.19; 5.19.2 to before 5.20	5.15.222, 5.19, 5.20	Patch available	CNA
Linux	Linux	6.0 and later	5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2	Patch available	CNA

Linux VendorLinux Affected 5.15.62 to before 5.15.222; 5.18.18 to before 5.19; 5.19.2 to before 5.20 Fixed in 5.15.222, 5.19, 5.20 Patch available CNA
Linux VendorLinux Affected 6.0 and later Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 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 5.15.222, 5.19, 5.20
Fix · CNA Linux (Linux) Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred

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-2026-93811
2026-10-03 Alias added: GHSA-47cf-52hv-jjq9
2026-10-03 Fix available: Linux/[email protected], Linux/[email protected], Linux/[email protected] +3 · CNA
2026-10-03 3 new references · CNA
2026-10-07 Affected versions changed · Red Hat
2026-11-07 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