TI-2025-15850 Aliases CVE-2025-21900 GHSA-5px9-qgxf-p79c

NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

LOW 33CWE-667Published 2025-04-01 · Updated 2026-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix a deadlock when recovering state on a sillyrenamed file If the file is sillyrenamed, and slated for delete on close, it is possible for a server reboot to triggeer an open reclaim, with can again race with the application call to close(). When that happens, the call to put_nfs_open_context() can trigger a synchronous delegreturn call which deadlocks because it is not marked as privileged. Instead, ensure that the call to nfs4_inode_return_delegation_on_close() catches the delegreturn, and schedules it asynchronously.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00355 29th percentileScored 2026-11-07

Fix Partial Linux (Linux): 6.12.18, 6.13.6, 6.14Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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	6.11 and later	6.12.18, 6.13.6, 6.14	Patch available	CNA

Linux VendorLinux Affected 6.11 and later Fixed in 6.12.18, 6.13.6, 6.14 Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	6.11 to before 6.12.18; 6.13 to before 6.13.6	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::	6.14 rc1	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::	6.14 rc2	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc3::::::	6.14 rc3	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc4::::::	6.14 rc4	Vulnerable	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.11 to before 6.12.18; 6.13 to before 6.13.6 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* Versions 6.14 rc1 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* Versions 6.14 rc2 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* Versions 6.14 rc3 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* Versions 6.14 rc4 Vulnerable ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 6.12.18, 6.13.6, 6.14

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: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Not affected: 1 product

Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2025-21900
2026-10-03 Alias added: GHSA-5px9-qgxf-p79c

References

Patch 3

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