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CVE Record

CVE-2026-64068: netfs: Fix missing locking around retry adding new subreqs

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing locking around retry adding new subreqs Fix netfs_retry_read_subrequests() and netfs_retry_write_stream() to take the appropriate lock when adding extra subrequests into stream->subrequests.

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-64068 is a critical Linux kernel netfs flaw involving unsafe handling of retry subrequests. The source assigns CVSS 9.8, indicating potential full confidentiality, integrity, and availability impact without authentication or user interaction. The public bundle does not prove real-world exploitation.

Executive priority

Treat as urgent for Linux fleet patch governance because the assigned impact is critical. Start with exposed, sensitive, and high-availability systems, while recognizing that the current public evidence does not confirm active exploitation.

Technical view

The bug is missing locking in netfs_retry_read_subrequests() and netfs_retry_write_stream() when adding extra subrequests to stream->subrequests. This is a kernel concurrency defect in Linux netfs. The source links two stable kernel commits as the resolution, but does not describe exploit mechanics.

Likely exposure

Exposure is likely limited to Linux systems running affected kernel builds with the relevant netfs code path present. The bundle lists Linux as affected and includes version markers around 6.10, 7.0.11, and 7.1, but distribution-specific package mapping requires vendor advisories.

Exploitation context

The CVE is not listed as KEV in the supplied bundle, and no cited source states active exploitation. The CVSS vector is network, low complexity, no privileges, and no user interaction, but the bundle provides limited practical exploitation detail.

Researcher notes

The public description is sparse: it identifies a locking defect and the affected functions, but not a CWE, exploit primitive, or affected configuration details. Validation should focus on commit presence, distro backports, and whether workloads can reach netfs retry paths.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable fixes.
  • Check distribution security advisories for fixed package versions.
  • Prioritize internet-facing or high-trust Linux systems first.
  • Track CISA KEV and vendor advisories for exploitation updates.

Validation and detection

  • Inventory Linux kernel versions across production and edge systems.
  • Confirm whether deployed kernels include the referenced stable commits.
  • Map distribution package versions to vendor fixed builds.
  • Review systems using netfs-related functionality for priority handling.
Prepared
Confidence
medium
Sources
4

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

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2026-64068 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2026-64068Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux288ace2f57c9d06dd2e42bd80d03747d879a4068, 288ace2f57c9d06dd2e42bd80d03747d879a4068unaffected
LinuxLinux6.10, 0, 7.0.11, 7.1affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.