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CVE Record

CVE-2026-23050: pNFS: Fix a deadlock when returning a delegation during open()

In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix a deadlock when returning a delegation during open() Ben Coddington reports seeing a hang in the following stack trace: 0 [ffffd0b50e1774e0] __schedule at ffffffff9ca05415 1 [ffffd0b50e177548] schedule at ffffffff9ca05717 2 [ffffd0b50e177558] bit_wait at ffffffff9ca061e1 3 [ffffd0b50e177568] __wait_on_bit at ffffffff9ca05cfb 4 [ffffd0b50e1775c8] out_of_line_wait_on_bit at ffffffff9ca05ea5 5 [ffffd0b50e177618] pnfs_roc at ffffffffc154207b [nfsv4] 6 [ffffd0b50e1776b8] _nfs4_proc_delegreturn at ffffffffc1506586 [nfsv4] 7 [ffffd0b50e177788] nfs4_proc_delegreturn at ffffffffc1507480 [nfsv4] 8 [ffffd0b50e1777f8] nfs_do_return_delegation at ffffffffc1523e41 [nfsv4] 9 [ffffd0b50e177838] nfs_inode_set_delegation at ffffffffc1524a75 [nfsv4] 10 [ffffd0b50e177888] nfs4_process_delegation at ffffffffc14f41dd [nfsv4] 11 [ffffd0b50e1778a0] _nfs4_opendata_to_nfs4_state at ffffffffc1503edf [nfsv4] 12 [ffffd0b50e1778c0] _nfs4_open_and_get_state at ffffffffc1504e56 [nfsv4] 13 [ffffd0b50e177978] _nfs4_do_open at ffffffffc15051b8 [nfsv4] 14 [ffffd0b50e1779f8] nfs4_do_open at ffffffffc150559c [nfsv4] 15 [ffffd0b50e177a80] nfs4_atomic_open at ffffffffc15057fb [nfsv4] 16 [ffffd0b50e177ad0] nfs4_file_open at ffffffffc15219be [nfsv4] 17 [ffffd0b50e177b78] do_dentry_open at ffffffff9c09e6ea 18 [ffffd0b50e177ba8] vfs_open at ffffffff9c0a082e 19 [ffffd0b50e177bd0] dentry_open at ffffffff9c0a0935 The issue is that the delegreturn is being asked to wait for a layout return that cannot complete because a state recovery was initiated. The state recovery cannot complete until the open() finishes processing the delegations it was given. The solution is to propagate the existing flags that indicate a non-blocking call to the function pnfs_roc(), so that it knows not to wait in this situation.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-23050 is a Linux kernel flaw in the NFSv4/pNFS client path that can cause a system hang during file open handling. The public record describes a deadlock, not data theft or remote code execution. Business urgency is highest for systems that rely on NFSv4/pNFS for critical file access or availability.

Executive priority

Treat as a targeted availability risk. Patch during normal or accelerated maintenance for NFS-dependent servers, clusters, and storage clients. It is not currently supported by sources as an emergency remote-compromise issue.

Technical view

The issue occurs when a delegation return waits for a pNFS layout return that cannot complete because state recovery is blocked until open() finishes processing delegations. The fix propagates existing non-blocking flags into pnfs_roc() so it does not wait in this condition. Public sources list Linux kernel impact and stable kernel commits resolving it.

Likely exposure

Exposure is most likely on Linux systems using NFSv4 with pNFS/delegation behavior, especially file clients handling open() operations against NFS infrastructure. Systems not using NFSv4/pNFS are less likely to encounter the vulnerable path. Exact distribution package impact must be checked with each Linux vendor.

Exploitation context

The provided sources describe a deadlock and kernel hang scenario. They do not report active exploitation, public exploit code, CVSS scoring, or KEV listing. Impact appears availability-focused and dependent on specific NFS client state conditions rather than broad unauthenticated compromise.

Researcher notes

Evidence is limited to the CVE description and Linux stable commit references. No CWE, CVSS, exploit status, or distribution-specific package matrix is provided. Analysis should focus on NFSv4/pNFS client code paths and whether local workloads can trigger the described delegation-return deadlock.

Mitigation direction

  • Prioritize updates for Linux systems that use NFSv4 or pNFS in production.
  • Apply vendor kernel updates that include the referenced stable fixes.
  • Check distribution advisories for exact affected package versions and backports.
  • Consider operational monitoring for NFS client hangs until patched.

Validation and detection

  • Inventory Linux hosts that mount or depend on NFSv4/pNFS shares.
  • Compare running kernel builds against vendor advisories and fixed stable commits.
  • Review incident logs for unexplained NFS client hangs during file open activity.
  • Confirm patched kernels are deployed after maintenance.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux29ade5db12930ec60133f6a02791f4b1a4af2943, 29ade5db12930ec60133f6a02791f4b1a4af2943, 29ade5db12930ec60133f6a02791f4b1a4af2943, 29ade5db12930ec60133f6a02791f4b1a4af2943unaffected
LinuxLinux4.10, 0, 6.6.130, 6.12.67, 6.18.7, 6.19affected
Weakness

CWE details

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