CVE-2026-64067

Status: AnalyzedCritical (9.8)—

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix missing barriers when accessing stream->subrequests locklessly

The list of subrequests attached to stream->subrequests is accessed without locks by netfs_collect_read_results() and netfs_collect_write_results(), and then they access subreq->flags without taking a barrier after getting the subreq pointer from the list. Relatedly, the functions that build the list don't use any sort of write barrier when constructing the list to make sure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if no lock is taken.

Read full descriptionShow less

Fix this by:

(3) Use list_add_tail_release() when adding a subreq to ->subrequests.

Technical details traces, logs and code from the original report

 (1) Add a new list_add_tail_release() function that uses a release barrier
     to set the pointer to the new member of the list.

 (2) Add a new list_first_entry_or_null_acquire() function that uses an
     acquire barrier to read the pointer to the first member in a list (or
     return NULL).

 (4) Use list_first_entry_or_null_acquire() when initially accessing the
     front of the list (when an item is removed, the pointer to the new
     front iterm is obtained under the same lock).

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 9.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.43%
Percentile among all scored CVEs: 35
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access70 %
Primary impactT1499.004 Application or System Exploitationimpact65 %
Secondary impactT1565.001 Stored Data Manipulationimpact60 %

AV:N/AC:L/PR:N/UI:N sugiere explotación remota sin privilegios (T1190). Las barreras de memoria faltantes en netfs pueden causar DoS por race condition (T1499.004) o corrupción de datos en caché de lectura/escritura (T1565.001).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network Traffic Vulnerability Scanning Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Network Segmentation

Affected technologies (1)

Linux — Linux Kernel

CWEs

CWE-667

References

Raw JSON (NVD)

Show

{
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing barriers when accessing stream->subrequests locklessly\n\nThe list of subrequests attached to stream->subrequests is accessed without\nlocks by netfs_collect_read_results() and netfs_collect_write_results(),\nand then they access subreq->flags without taking a barrier after getting\nthe subreq pointer from the list.  Relatedly, the functions that build the\nlist don't use any sort of write barrier when constructing the list to make\nsure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if\nno lock is taken.\n\nFix this by:\n\n (1) Add a new list_add_tail_release() function that uses a release barrier\n     to set the pointer to the new member of the list.\n\n (2) Add a new list_first_entry_or_null_acquire() function that uses an\n     acquire barrier to read the pointer to the first member in a list (or\n     return NULL).\n\n (3) Use list_add_tail_release() when adding a subreq to ->subrequests.\n\n (4) Use list_first_entry_or_null_acquire() when initially accessing the\n     front of the list (when an item is removed, the pointer to the new\n     front iterm is obtained under the same lock)."
    }
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  "lastModified": "2026-09-03T15:34:39.507",
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