github - ghsa-57pg-f379-59c5

ghsa-57pg-f379-59c5

Vulnerability from github

Published

2025-09-16 15:32

Modified

2025-09-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths

Since the buffers are mapped from userspace, it is prudent to use READ_ONCE() to read the value into a local variable, and use that for any other actions taken. Having a stable read of the buffer length avoids worrying about it changing after checking, or being read multiple times.

Similarly, the buffer may well change in between it being picked and being committed. Ensure the looping for incremental ring buffer commit stops if it hits a zero sized buffer, as no further progress can be made at that point.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39816"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T13:15:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths\n\nSince the buffers are mapped from userspace, it is prudent to use\nREAD_ONCE() to read the value into a local variable, and use that for\nany other actions taken. Having a stable read of the buffer length\navoids worrying about it changing after checking, or being read multiple\ntimes.\n\nSimilarly, the buffer may well change in between it being picked and\nbeing committed. Ensure the looping for incremental ring buffer commit\nstops if it hits a zero sized buffer, as no further progress can be made\nat that point.",
  "id": "GHSA-57pg-f379-59c5",
  "modified": "2025-09-25T12:31:04Z",
  "published": "2025-09-16T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39816"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/390a61d284e1ced088d43928dfcf6f86fffdd780"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/695673eb5711ee5eb1769481cf1503714716a7d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98b6fa62c84f2e129161e976a5b9b3cb4ccd117b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-39816 (GCVE-0-2025-39816)

Vulnerability from cvelistv5

Published

2025-09-16 13:00

Modified

2025-09-29 06:00

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths Since the buffers are mapped from userspace, it is prudent to use READ_ONCE() to read the value into a local variable, and use that for any other actions taken. Having a stable read of the buffer length avoids worrying about it changing after checking, or being read multiple times. Similarly, the buffer may well change in between it being picked and being committed. Ensure the looping for incremental ring buffer commit stops if it hits a zero sized buffer, as no further progress can be made at that point.

References

▼	URL	Tags
	https://git.kernel.org/stable/c/695673eb5711ee5eb1769481cf1503714716a7d1
	https://git.kernel.org/stable/c/390a61d284e1ced088d43928dfcf6f86fffdd780
	https://git.kernel.org/stable/c/98b6fa62c84f2e129161e976a5b9b3cb4ccd117b

Impacted products

Vendor

Product

Version

▼

Linux

Version: ae98dbf43d755b4e111fcd086e53939bef3e9a1a
Version: ae98dbf43d755b4e111fcd086e53939bef3e9a1a
Version: ae98dbf43d755b4e111fcd086e53939bef3e9a1a

Linux

Version: 6.12

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/kbuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "695673eb5711ee5eb1769481cf1503714716a7d1",
              "status": "affected",
              "version": "ae98dbf43d755b4e111fcd086e53939bef3e9a1a",
              "versionType": "git"
            },
            {
              "lessThan": "390a61d284e1ced088d43928dfcf6f86fffdd780",
              "status": "affected",
              "version": "ae98dbf43d755b4e111fcd086e53939bef3e9a1a",
              "versionType": "git"
            },
            {
              "lessThan": "98b6fa62c84f2e129161e976a5b9b3cb4ccd117b",
              "status": "affected",
              "version": "ae98dbf43d755b4e111fcd086e53939bef3e9a1a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/kbuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.49",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.5",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths\n\nSince the buffers are mapped from userspace, it is prudent to use\nREAD_ONCE() to read the value into a local variable, and use that for\nany other actions taken. Having a stable read of the buffer length\navoids worrying about it changing after checking, or being read multiple\ntimes.\n\nSimilarly, the buffer may well change in between it being picked and\nbeing committed. Ensure the looping for incremental ring buffer commit\nstops if it hits a zero sized buffer, as no further progress can be made\nat that point."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:00:14.095Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/695673eb5711ee5eb1769481cf1503714716a7d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/390a61d284e1ced088d43928dfcf6f86fffdd780"
        },
        {
          "url": "https://git.kernel.org/stable/c/98b6fa62c84f2e129161e976a5b9b3cb4ccd117b"
        }
      ],
      "title": "io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39816",
    "datePublished": "2025-09-16T13:00:17.026Z",
    "dateReserved": "2025-04-16T07:20:57.138Z",
    "dateUpdated": "2025-09-29T06:00:14.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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