CVE-2026-64058 (GCVE-0-2026-64058)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-09-14 11:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_folio() to wait on writeback Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag).
References
Impacted products
Vendor Product Version
Linux Linux Version: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e
Version: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e
Version: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e
Version: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/buffered_read.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "version": "6.12.110",
              "versionType": "semver"
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              "version": "6.18.34",
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              "version": "7.0.11",
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      ],
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          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
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                {
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                  "vulnerable": true
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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 netfs_read_folio() to wait on writeback\n\nFix netfs_read_folio() to wait for an ongoing writeback to complete so that\nit can trust the dirty flag and whatever is attached to folio-\u003eprivate\n(folio-\u003eprivate may get cleaned up by the collector before it clears the\nwriteback flag)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the netfs client page-cache path (`netfs_read_folio()`), reached only through local VFS operations (read/mmap/page fault) on mounted network filesystems (CIFS, Ceph, AFS, 9p, NFS+fscache), not from remote packet handling.\nAC:L - An attacker can reliably trigger the race by concurrently performing streaming writes and reads on the same folio from threads they control, forcing writeback while reads hit the vulnerable dirty-folio path.\nPR:L - Exploitation requires only unprivileged access to read/write files on an already-mounted netfs-backed filesystem; no CAP_SYS_ADMIN, real root, or user-namespace capability is needed.\nUI:N - No victim interaction is required beyond the attacker (or any local process with file access) issuing the concurrent read/write operations that trigger the race.\nS:U - The vulnerability corrupts kernel heap memory during local filesystem I/O in the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries.\nC:H - The race frees `struct netfs_folio` in `folio-\u003eprivate` before writeback completes, creating a use-after-free that can expose or leak kernel heap contents when `netfs_read_gaps()` dereferences stale metadata.\nI:H - UAF on the kmalloc\u0027d `netfs_folio` object can be leveraged for heap manipulation; corrupted `dirty_offset`/`dirty_len` values drive subsequent I/O vector setup and pagecache writes in `netfs_read_gaps()`.\nA:H - Winning the race causes kernel oops/panic via NULL dereference or use-after-free during `netfs_read_gaps()`, and a malicious local user can repeat the trigger to deny availability on shared servers with CIFS/NFS/Ceph mounts."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:58:36.477Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/090a8aa1894b72f5b3fc18dee68d42ad45f4a2c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/f17b9121bb99f88188ec9be2db5da1d561f4c01b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8271cccdd5e43cc8d738afb8b51f6ad05b1cb4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ded0c6f1606061148c202825f7e53d711f9f84cf"
        }
      ],
      "title": "netfs: Fix netfs_read_folio() to wait on writeback",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64058",
    "datePublished": "2026-07-19T15:39:38.978Z",
    "dateReserved": "2026-07-19T07:54:57.030Z",
    "dateUpdated": "2026-09-14T11:58:36.477Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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