Linux Kernel up to 6.12.108/6.18.49/7.2.3 NFSv4.1 pNFS Layout Processing pnfs_layout_process reference count

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00+

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.12.108/6.18.49/7.2.3. Impacted is the function pnfs_layout_process of the component NFSv4.1 pNFS Layout Processing. The manipulation leads to reference count. This vulnerability is traded as CVE-2026-89710. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.108/6.18.49/7.2.3 and classified as critical. This issue affects the function pnfs_layout_process of the component NFSv4.1 pNFS Layout Processing. The manipulation with an unknown input leads to a reference count vulnerability. Using CWE to declare the problem leads to CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path When the server returns a new layout stateid while a valid one is still held, pnfs_layout_process() calls pnfs_mark_matching_lsegs_return() on the on-stack free_me list and jumps to out_forget. Segments whose reference count drops to zero are unlinked from lo->plh_segs and moved to free_me by mark_lseg_invalid(); for an idle cached segment the layout header holds the only reference, so this happens on the first decrement. out_forget never drains free_me -- only the success path calls pnfs_free_lseg_list(). Commit 814b84971388 ("pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()") added the drain; commit 08bd8dbe8882 ("pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()") removed it while switching the destination to lo->plh_return_segs, which is drained elsewhere. Commit fb700ef02676 ("NFSv4.1: Simplify layout return in pnfs_layout_process()") switched the destination back to free_me without restoring the drain. Restore the pnfs_free_lseg_list() call.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-89710 since 09/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026).

Upgrading to version 6.12.109, 6.18.50, 7.2.4 or 7.3-rc1 eliminates this vulnerability. Applying the patch 7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2/36e3f13bf0728f4ce11ee8904cec82a783222f62/32ac1b0b7f1cfa0d1a1faf9c72f4154046101070/ee5a386cfe60f3f8286de16a9db8e1a08f0bc124 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
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: Reference count
CWE: CWE-911 / CWE-664
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.109/6.18.50/7.2.4/7.3-rc1
Patch: 7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2/36e3f13bf0728f4ce11ee8904cec82a783222f62/32ac1b0b7f1cfa0d1a1faf9c72f4154046101070/ee5a386cfe60f3f8286de16a9db8e1a08f0bc124

Timelineinfo

09/11/2026 Advisory disclosed
09/11/2026 +0 days CVE reserved
09/11/2026 +0 days VulDB entry created
09/11/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89710 (🔒)
GCVE (CVE): GCVE-0-2026-89710
GCVE (VulDB): GCVE-100-402539

Entryinfo

Created: 09/11/2026 22:06
Changes: 09/11/2026 22:06 (59)
Complete: 🔍
Cache ID: 216::103

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