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CVE-2026-72364 (GCVE-0-2026-72364)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
netfs: Fix writeback error handling
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix writeback error handling Fix the error handling in writeback_iter() loop. If an error occurs, writeback_iter() needs to be called again with *error set to the error so that it can clean up iteration state. Further, the current folio needs unlocking and redirtying.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < fb39ffd3cc5422887fd118668ff45ebfdbc83302 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 1bb33d959aabcde07d724b5eb9992462e91fa79a (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "fs/netfs/write_issue.c"
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix writeback error handling\n\nFix the error handling in writeback_iter() loop.  If an error occurs,\nwriteback_iter() needs to be called again with *error set to the error so\nthat it can clean up iteration state.  Further, the current folio needs\nunlocking and redirtying."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in client-side netfs writeback reached only via local VFS writeback (do_writepages -\u003e netfs_writepages) on CIFS, 9p, and AFS mounts after local writes/mmaps dirty pagecache; it is not in ksmbd/nfsd or other packet-receive paths.\nAC:L - An attacker can reliably trigger -ENOMEM during writeback by exhausting the 100-entry folio_queue mempool or system memory while dirtying many pages on a netfs mount, then forcing writeback via sync/fsync, close, or reclaim.\nPR:L - Exploitation requires a local process with write access to files on a netfs-backed mount (typical unprivileged CIFS/9p/AFS user); no real-root or init-namespace-only capability is needed beyond normal filesystem permissions.\nUI:N - No victim interaction is required beyond normal background writeback or attacker-initiated sync/memory pressure; exploitation does not depend on a victim opening a file or mounting a share at attack time.\nS:U - Impact is confined to the kernel pagecache and netfs writeback state on the affected host; it does not cross VM, container, or IOMMU security boundaries into another authority.\nC:N - The flaw mishandles folio locks and dirty state causing data loss or hangs; it does not expose kernel memory, leak pointers, or provide an out-of-bounds or use-after-free read primitive.\nI:H - On -ENOMEM at writeback start the vulnerable path calls netfs_kill_dirty_pages(), which clears dirty folios without uploading them, silently destroying arbitrary unsaved buffered data on network filesystem mounts.\nA:H - Breaking out of the writeback_iter loop on error leaves folios locked and writeback state uncleared, causing indefinite blocking of processes accessing those pages and stalling future writeback on affected files."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:18.766Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/fb39ffd3cc5422887fd118668ff45ebfdbc83302"
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          "url": "https://git.kernel.org/stable/c/1bb33d959aabcde07d724b5eb9992462e91fa79a"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e"
        }
      ],
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72364",
    "datePublished": "2026-08-15T05:56:02.722Z",
    "dateReserved": "2026-08-09T03:40:39.921Z",
    "dateUpdated": "2026-08-17T05:43:18.766Z",
    "state": "PUBLISHED"
  },
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      "percentile": "0.06651"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:41:21+00:00",
      "cve": "CVE-2026-72364",
      "id": "CVE-2026-72364",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfs: Fix writeback error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72364.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

Author Source Type Date Other

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.