Linux Kernel up to 6.17.8 NFSD nfs4_free_ol_stateid denial of service

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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.17.8. It has been declared as critical. This vulnerability affects the function nfs4_free_ol_stateid of the component NFSD. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2025-40273. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.17.8 and classified as critical. Affected by this issue is the function nfs4_free_ol_stateid of the component NFSD. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: NFSD: free copynotify stateid in nfs4_free_ol_stateid() Typically copynotify stateid is freed either when parent's stateid is being close/freed or in nfsd4_laundromat if the stateid hasn't been used in a lease period. However, in case when the server got an OPEN (which created a parent stateid), followed by a COPY_NOTIFY using that stateid, followed by a client reboot. New client instance while doing CREATE_SESSION would force expire previous state of this client. It leads to the open state being freed thru release_openowner-> nfs4_free_ol_stateid() and it finds that it still has copynotify stateid associated with it. We currently print a warning and is triggerred WARNING: CPU: 1 PID: 8858 at fs/nfsd/nfs4state.c:1550 nfs4_free_ol_stateid+0xb0/0x100 [nfsd] This patch, instead, frees the associated copynotify stateid here. If the parent stateid is freed (without freeing the copynotify stateids associated with it), it leads to the list corruption when laundromat ends up freeing the copynotify state later. [ 1626.839430] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 1626.842828] Modules linked in: nfnetlink_queue nfnetlink_log bluetooth cfg80211 rpcrdma rdma_cm iw_cm ib_cm ib_core nfsd nfs_acl lockd grace nfs_localio ext4 crc16 mbcache jbd2 overlay uinput snd_seq_dummy snd_hrtimer qrtr rfkill vfat fat uvcvideo snd_hda_codec_generic videobuf2_vmalloc videobuf2_memops snd_hda_intel uvc snd_intel_dspcfg videobuf2_v4l2 videobuf2_common snd_hda_codec snd_hda_core videodev snd_hwdep snd_seq mc snd_seq_device snd_pcm snd_timer snd soundcore sg loop auth_rpcgss vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vmw_vmci vsock xfs 8021q garp stp llc mrp nvme ghash_ce e1000e nvme_core sr_mod nvme_keyring nvme_auth cdrom vmwgfx drm_ttm_helper ttm sunrpc dm_mirror dm_region_hash dm_log iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi fuse dm_multipath dm_mod nfnetlink [ 1626.855594] CPU: 2 UID: 0 PID: 199 Comm: kworker/u24:33 Kdump: loaded Tainted: G B W 6.17.0-rc7+ #22 PREEMPT(voluntary) [ 1626.857075] Tainted: [B]=BAD_PAGE, [W]=WARN [ 1626.857573] Hardware name: VMware, Inc. VMware20,1/VBSA, BIOS VMW201.00V.24006586.BA64.2406042154 06/04/2024 [ 1626.858724] Workqueue: nfsd4 laundromat_main [nfsd] [ 1626.859304] pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 1626.860010] pc : __list_del_entry_valid_or_report+0x148/0x200 [ 1626.860601] lr : __list_del_entry_valid_or_report+0x148/0x200 [ 1626.861182] sp : ffff8000881d7a40 [ 1626.861521] x29: ffff8000881d7a40 x28: 0000000000000018 x27: ffff0000c2a98200 [ 1626.862260] x26: 0000000000000600 x25: 0000000000000000 x24: ffff8000881d7b20 [ 1626.862986] x23: ffff0000c2a981e8 x22: 1fffe00012410e7d x21: ffff0000920873e8 [ 1626.863701] x20: ffff0000920873e8 x19: ffff000086f22998 x18: 0000000000000000 [ 1626.864421] x17: 20747562202c3839 x16: 3932326636383030 x15: 3030666666662065 [ 1626.865092] x14: 6220646c756f6873 x13: 0000000000000001 x12: ffff60004fd9e4a3 [ 1626.865713] x11: 1fffe0004fd9e4a2 x10: ffff60004fd9e4a2 x9 : dfff800000000000 [ 1626.866320] x8 : 00009fffb0261b5e x7 : ffff00027ecf2513 x6 : 0000000000000001 [ 1626.866938] x5 : ffff00027ecf2510 x4 : ffff60004fd9e4a3 x3 : 0000000000000000 [ 1626.867553] x2 : 0000000000000000 x1 : ffff000096069640 x0 : 000000000000006d [ 1626.868167] Call trace: [ 1626.868382] __list_del_entry_valid_or_report+0x148/0x200 (P) [ 1626.868876] _free_cpntf_state_locked+0xd0/0x268 [nfsd] [ 1626.869368] nfs4_laundromat+0x6f8/0x1058 [nfsd] [ 1626.869813] laundromat_main+0x24/0x60 [nfsd] [ 1626.870231] process_one_work+0x584/0x1050 [ 1626.870595] worker_thread+0x4c4/0xc60 [ 1626.870893] kthread+0x2f8/0x398 [ 1626.871146] ret_from_fork+0x10/0x20 [ 1626.871422] Code: aa1303e1 aa1403e3 910e8000 97bc55d7 (d4210000) [ 1626.871892] SMP: stopping secondary CPUs

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2025-40273 since 04/16/2025. The exploitation is known to be difficult. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 278559 (Debian dla-4404 : ata-modules-5.10.0-35-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59 or 6.17.9 eliminates this vulnerability. Applying the patch 935a2dc8928670bb2c37e21025331e61ec48ccf4/b114996a095da39e38410a0328d4a8aca8c36088/839f56f626723f36904764858467e7a3881b975d/29fbb3ad4018ca2b0988fbac76f4c694cc6d7e66/d7be15a634aa3874827d0d3ea47452ee878b8df7/f67ad9b33b0e6f00d2acc67cbf9cfa5c756be5fb/4aa17144d5abc3c756883e3a010246f0dba8b468 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (278559), EUVD (EUVD-2025-201582) and CERT Bund (WID-SEC-2025-2756). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • NetApp FAS
  • NetApp AFF
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Microsoft Azure Linux

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 278559
Nessus Name: Debian dla-4404 : ata-modules-5.10.0-35-armmp-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.247/5.15.197/6.1.159/6.6.117/6.12.59/6.17.9
Patch: 935a2dc8928670bb2c37e21025331e61ec48ccf4/b114996a095da39e38410a0328d4a8aca8c36088/839f56f626723f36904764858467e7a3881b975d/29fbb3ad4018ca2b0988fbac76f4c694cc6d7e66/d7be15a634aa3874827d0d3ea47452ee878b8df7/f67ad9b33b0e6f00d2acc67cbf9cfa5c756be5fb/4aa17144d5abc3c756883e3a010246f0dba8b468

Timelineinfo

04/16/2025 CVE reserved
12/07/2025 +235 days Advisory disclosed
12/07/2025 +0 days VulDB entry created
02/23/2026 +78 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40273 (🔒)
GCVE (CVE): GCVE-0-2025-40273
GCVE (VulDB): GCVE-100-334634
EUVD: 🔒
CERT Bund: WID-SEC-2025-2756 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/07/2025 08:54
Updated: 02/23/2026 04:59
Changes: 12/07/2025 08:54 (59), 12/07/2025 09:28 (1), 12/09/2025 07:33 (7), 12/13/2025 08:43 (2), 01/04/2026 12:38 (1), 01/22/2026 07:09 (1), 02/23/2026 04:59 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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