CVE-2026-64062 (GCVE-0-2026-64062)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
netfs: Fix potential deadlock in write-through mode
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential deadlock in write-through mode Fix netfs_advance_writethrough() to always unlock the supplied folio and to mark it dirty if it isn't yet written to the end. Unfortunately, it can't be marked for writeback until the folio is done with as that may cause a deadlock against mmapped reads and writes. Even though it has been marked dirty, premature writeback can't occur as the caller is holding both inode->i_rwsem (which will prevent concurrent truncation, fallocation, DIO and other writes) and ictx->wb_lock (which will cause flushing to wait and writeback to skip or wait). Note that this may be easier to deal with once the queuing of folios is split from the generation of subrequests.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 1468f39243ccb155b6d97f9a9932f610d1205d75 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 003aa0dd26c964025acd6d1213bcdbd674db2ca9 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < e40e9cbf3ee4d30ee9a97bd128c85500b6ad0da1 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < b6a4ae1634b3ad2aaa05222e53d36da532852faf (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/write_issue.c"
          ],
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix potential deadlock in write-through mode\n\nFix netfs_advance_writethrough() to always unlock the supplied folio and to\nmark it dirty if it isn\u0027t yet written to the end.  Unfortunately, it can\u0027t\nbe marked for writeback until the folio is done with as that may cause a\ndeadlock against mmapped reads and writes.\n\nEven though it has been marked dirty, premature writeback can\u0027t occur as\nthe caller is holding both inode-\u003ei_rwsem (which will prevent concurrent\ntruncation, fallocation, DIO and other writes) and ictx-\u003ewb_lock (which\nwill cause flushing to wait and writeback to skip or wait).\n\nNote that this may be easier to deal with once the queuing of folios is\nsplit from the generation of subrequests."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:39:41.523Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1468f39243ccb155b6d97f9a9932f610d1205d75"
        },
        {
          "url": "https://git.kernel.org/stable/c/003aa0dd26c964025acd6d1213bcdbd674db2ca9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e40e9cbf3ee4d30ee9a97bd128c85500b6ad0da1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6a4ae1634b3ad2aaa05222e53d36da532852faf"
        }
      ],
      "title": "netfs: Fix potential deadlock in write-through mode",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64062",
    "datePublished": "2026-07-19T15:39:41.523Z",
    "dateReserved": "2026-07-19T07:54:57.030Z",
    "dateUpdated": "2026-07-19T15:39:41.523Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-21",
      "epss": "0.00168",
      "percentile": "0.06401"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-20T10:42:28+00:00",
      "cve": "CVE-2026-64062",
      "id": "CVE-2026-64062",
      "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 potential deadlock in write-through mode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64062.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.

Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.