TI-2025-25271 Aliases CVE-2025-37924 GHSA-3x67-44wh-mrgf

ksmbd: fix use-after-free in kerberos authentication

HIGH 70CWE-416Published 2025-05-20 · Updated 2026-10-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.24546 97th percentileScored 2026-11-07

Fix Fixed Linux (Linux): 6.1.138, 6.6.90, 6.12.28 +2

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	5.15 and later	6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15	Patch available	CNA

Linux VendorLinux Affected 5.15 and later Fixed in 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 Patch available CNA

CPE configurations NVD · 6

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	5.15 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc1::::::	6.15 rc1	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc2::::::	6.15 rc2	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc3::::::	6.15 rc3	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc4::::::	6.15 rc4	Vulnerable	Linux
cpe:2.3:o:debian:debian_linux:11.0:::::::*	11.0	Vulnerable	Debian

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* Versions 6.15 rc1 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* Versions 6.15 rc2 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:* Versions 6.15 rc3 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:* Versions 6.15 rc4 Vulnerable ·Linux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

Fix · CNA Linux (Linux) Fixed in 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15

Vendor assessments

Red Hat

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

Not affected: 5 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

Timeline

2026-10-02 Threatist record created from CVE-2025-37924
2026-10-03 Alias added: GHSA-3x67-44wh-mrgf
2026-10-16 CISA SSVC decision points changed
2026-10-16 Priority changed: MEDIUM → HIGH
2026-11-07 Affected versions changed · Red Hat

References

Patch 5

Advisory 1

https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html

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-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
TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3

See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences