CVE-2026-72355 (GCVE-0-2026-72355)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:43
VLAI
Title
netfs: Fix barriering when walking subrequest list
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix barriering when walking subrequest list Fix the barriering used when walking the subrequest list in retry as there's a possibility of seeing a subreq that's just been added by the application thread.
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 CPE status
Linux Linux Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < be47c047250671c9225c0319ca4695be9b391c59 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 5c6ce05e406520290c1d89da97fb3cd70c09137d (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/read_retry.c",
            "fs/netfs/write_retry.c"
          ],
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          "vendor": "Linux",
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                  "vulnerable": true
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix barriering when walking subrequest list\n\nFix the barriering used when walking the subrequest list in retry as\nthere\u0027s a possibility of seeing a subreq that\u0027s just been added by the\napplication thread."
        }
      ],
      "metrics": [
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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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The flaw is in the netfs client retry path used by SMB/CIFS, Ceph, NFS+fscache, and AFS; a remote malicious or MITM file server can trigger NEED_RETRY via short/error network responses during client read/write I/O.\nAC:L - The attacker controls both sides of the race by timing retry-inducing server responses and issuing concurrent reads/writes (multiple threads/fds); no victim-specific memory layout or rare uncontrollable state is required beyond normal mounted-FS I/O.\nPR:N - No local privileges on the victim are required; a remote attacker operating a malicious or compromised SMB/Ceph/NFS/AFS server can exploit any client with an active mount performing file I/O, without shell or admin access on the client.\nUI:N - On commonly pre-mounted enterprise/automounted network shares, kernel readahead and writeback can reach the buggy retry path without additional victim action at exploitation time beyond existing background file access.\nS:U - Exploitation corrupts the client kernel heap and enables local privilege escalation within the same kernel security domain; it does not by itself cross a VM/host or IOMMU boundary.\nC:H - Observing partially published subrequest entries yields stale start/len/flags/io_iter values, causing out-of-bounds kernel reads and information disclosure from adjacent memory via mis-sized iterators.\nI:H - Corrupted subrequest metadata drives wrong-span reissue_read/write, erroneous list deletion, and refcount manipulation, providing heap corruption primitives that can be leveraged for arbitrary kernel writes and code execution.\nA:H - Incorrect list traversal and mis-issued I/O can cause use-after-free, refcount underflow, kernel oops, or panic, reliably crashing or hanging the affected system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:13.252Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/be47c047250671c9225c0319ca4695be9b391c59"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c6ce05e406520290c1d89da97fb3cd70c09137d"
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      ],
      "title": "netfs: Fix barriering when walking subrequest list",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72355",
    "datePublished": "2026-08-15T05:55:56.812Z",
    "dateReserved": "2026-08-09T03:40:39.921Z",
    "dateUpdated": "2026-08-17T05:43:13.252Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72355",
      "date": "2026-08-19",
      "epss": "0.00554",
      "percentile": "0.43847"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:39:48+00:00",
      "cve": "CVE-2026-72355",
      "id": "CVE-2026-72355",
      "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 barriering when walking subrequest list",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72355.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.


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