CVE-2026-64067 (GCVE-0-2026-64067)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
netfs: Fix missing barriers when accessing stream->subrequests locklessly
Summary
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. Fix this by: (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). (3) Use list_add_tail_release() when adding a subreq to ->subrequests. (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).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 293a4532c36f38458e38b8879b174ab797718b9d (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < b5782e2d462c028096f922abca46318cec890670 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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        {
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          "programFiles": [
            "fs/netfs/buffered_read.c",
            "fs/netfs/misc.c",
            "fs/netfs/read_collect.c",
            "fs/netfs/write_collect.c",
            "fs/netfs/write_issue.c",
            "include/linux/list.h"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing barriers when accessing stream-\u003esubrequests locklessly\n\nThe list of subrequests attached to stream-\u003esubrequests is accessed without\nlocks by netfs_collect_read_results() and netfs_collect_write_results(),\nand then they access subreq-\u003eflags without taking a barrier after getting\nthe subreq pointer from the list.  Relatedly, the functions that build the\nlist don\u0027t 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 -\u003esubrequests.\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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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:42:58.657Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5782e2d462c028096f922abca46318cec890670"
        }
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      "title": "netfs: Fix missing barriers when accessing stream-\u003esubrequests locklessly",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64067",
    "datePublished": "2026-07-19T15:39:44.660Z",
    "dateReserved": "2026-07-19T07:54:57.030Z",
    "dateUpdated": "2026-07-20T13:42:58.657Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T16:47:59+00:00",
      "cve": "CVE-2026-64067",
      "id": "CVE-2026-64067",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfs: Fix missing barriers when accessing stream-\u003esubrequests locklessly",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64067.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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