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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 05a685b38dbca489d5f21eac9e7f20959344076a, 857bf9056291a16785ae3be1d291026b2437fc48, a316fd9d3065b753b03d802530004aea481512cc.

Low priority for now. Upgrade to Linux Linux 05a685b38dbca489d5f21eac9e7f20959344076a, 857bf9056291a16785ae3be1d291026b2437fc48, a316fd9d3065b753b03d802530004aea481512cc or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Feb 4, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.10affected
    • 29ade5db12930ec60133f6a02791f4b1a4af2943 and later · before 05a685b38dbca489d5f21eac9e7f20959344076aaffected · git
    • 29ade5db12930ec60133f6a02791f4b1a4af2943 and later · before c57387d447a2bcbaea009ba5f9497adf3de5edebaffected · git
    • 29ade5db12930ec60133f6a02791f4b1a4af2943 and later · before a316fd9d3065b753b03d802530004aea481512ccaffected · git
    • 29ade5db12930ec60133f6a02791f4b1a4af2943 and later · before d6c75aa9d607044d1e5c8498eff0259eed356c32affected · git
    • 29ade5db12930ec60133f6a02791f4b1a4af2943 and later · before 857bf9056291a16785ae3be1d291026b2437fc48affected · git
    • before 4.10not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.130 and later · up to and including 6.6.*not affected · semver
    • 6.12.67 and later · up to and including 6.12.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.8-16.18.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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Published before and after this one in the same product

  • ← EarlierCVE-2025-71197Feb 4, 2026 · w1: therm: Fix off-by-one buffer overflow in alarms_store
    0Monitor
  • ← EarlierCVE-2025-71198Feb 4, 2026 · iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
    0Monitor
  • Later →CVE-2026-23054Feb 4, 2026 · net: hv_netvsc: reject RSS hash key programming without RX indirection table
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux05a685b38dbca489d5f21eac9e7f20959344076aVendor (CNA)
Linux Linux857bf9056291a16785ae3be1d291026b2437fc48Vendor (CNA)
Linux Linuxa316fd9d3065b753b03d802530004aea481512ccVendor (CNA)
Linux Linuxc57387d447a2bcbaea009ba5f9497adf3de5edebVendor (CNA)
Linux Linuxd6c75aa9d607044d1e5c8498eff0259eed356c32Vendor (CNA)
debian:linux6.12.69-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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