CVE-2026-64160 (GCVE-0-2026-64160)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-10-19 20:28
VLAI
Title
netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential for tearing in ->remote_i_size and ->zero_point Fix potential tearing in using ->remote_i_size and ->zero_point by copying i_size_read() and i_size_write() and using the same seqcount as for i_size. We need to make sure that netfslib and the filesystems that use it always hold i_lock whilst updating any of the sizes to prevent i_size_seqcount from getting corrupted.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:37 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6890 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4058f742105ecfcbdf99e1139e6c1f74fb8e6db9 , < 55970f238d495517edc961d55c44c772594d0969 (git)
Affected: 4058f742105ecfcbdf99e1139e6c1f74fb8e6db9 , < 2c8f4742bb76117d735f92a3932d85239b16c494 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                "fs/afs/file.c",
                "fs/afs/inode.c",
                "fs/afs/internal.h",
                "fs/afs/write.c",
                "fs/netfs/buffered_read.c",
                "fs/netfs/buffered_write.c",
                "fs/netfs/direct_write.c",
                "fs/netfs/misc.c",
                "fs/netfs/write_collect.c",
                "fs/smb/client/cifsfs.c",
                "fs/smb/client/cifssmb.c",
                "fs/smb/client/file.c",
                "fs/smb/client/inode.c",
                "fs/smb/client/readdir.c",
                "fs/smb/client/smb2ops.c",
                "fs/smb/client/smb2pdu.c",
                "include/linux/netfs.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.18"
                },
                {
                  "lessThan": "5.18",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.0.*",
                  "status": "unaffected",
                  "version": "7.0.11",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0.11",
                      "versionStartIncluding": "5.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1",
                      "versionStartIncluding": "5.18",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix potential for tearing in -\u003eremote_i_size and -\u003ezero_point\n\nFix potential tearing in using -\u003eremote_i_size and -\u003ezero_point by copying\ni_size_read() and i_size_write() and using the same seqcount as for i_size.\n\nWe need to make sure that netfslib and the filesystems that use it always\nhold i_lock whilst updating any of the sizes to prevent i_size_seqcount\nfrom getting corrupted."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "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 bug is in netfs client code (CIFS/SMB, AFS, 9p) reached when processing network filesystem protocol responses and concurrent I/O; a malicious remote server can drive attribute/size updates that race with client read/write paths.\nAC:L - The attacker controls both sides of the race by timing SMB/AFS/9p responses against concurrent local read/write/DIO operations, or by spawning parallel threads performing file I/O on the same inode.\nPR:N - A remote malicious filesystem server needs no privileges on the victim host; exploitation only requires the victim system to perform routine I/O against a mounted attacker-controlled or MITM\u0027d network share.\nUI:N - No per-attack discretionary user action is required beyond an existing CIFS/AFS/9p mount and normal automated or concurrent file access, which is typical in enterprise and embedded deployments.\nS:U - Impact is confined to the victim kernel\u0027s netfs client subsystem and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Torn 64-bit size values produce attacker-influenceable arbitrary bounds used in read-length and EOF decisions, potentially causing out-of-bounds kernel reads or stale-cache data exposure beyond intended file ranges.\nI:H - Corrupted size metadata causes incorrect zero-filling, skipped server reads, and wrong EOF handling, enabling arbitrary modification of file content visible to applications and incorrect size metadata written back to the server.\nA:H - Unsynchronized writes can corrupt i_size_seqcount, causing i_size_read() and related readers to spin forever, producing soft lockups and denial of service for affected inodes and dependent processes."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:39:50.187Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/55970f238d495517edc961d55c44c772594d0969"
            },
            {
              "url": "https://git.kernel.org/stable/c/2c8f4742bb76117d735f92a3932d85239b16c494"
            }
          ],
          "title": "netfs: Fix potential for tearing in -\u003eremote_i_size and -\u003ezero_point",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64160",
        "datePublished": "2026-07-19T15:40:47.063Z",
        "dateReserved": "2026-07-19T07:54:57.038Z",
        "dateUpdated": "2026-10-16T15:42:24.995Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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