github - ghsa-5xmf-424g-jjhg

GHSA-5XMF-424G-JJHG

Vulnerability from github – Published: 2025-09-16 15:32 – Updated: 2025-12-02 21:31

Details

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

io_uring/kbuf: fix signedness in this_len calculation

When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39822"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T13:15:59Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: fix signedness in this_len calculation\n\nWhen importing and using buffers, buf-\u003elen is considered unsigned.\nHowever, buf-\u003elen is converted to signed int when committing. This can\nlead to unexpected behavior if the buffer is large enough to be\ninterpreted as a negative value. Make min_t calculation unsigned.",
  "id": "GHSA-5xmf-424g-jjhg",
  "modified": "2025-12-02T21:31:27Z",
  "published": "2025-09-16T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39822"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-39822 (GCVE-0-2025-39822)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2025-09-29 06:00

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: fix signedness in this_len calculation When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/f4f411c068402c370…
	https://git.kernel.org/stable/c/c64eff368ac676e85…

Impacted products

Vendor

Product

Version

Linux

Affected: ae98dbf43d755b4e111fcd086e53939bef3e9a1a , < f4f411c068402c370c4f9a9d4950a97af97bbbb1 (git)
Affected: ae98dbf43d755b4e111fcd086e53939bef3e9a1a , < c64eff368ac676e8540344d27a3de47e0ad90d21 (git)

Linux

Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.16.5 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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JSON

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  "containers": {
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        {
          "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": [
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              "lessThan": "f4f411c068402c370c4f9a9d4950a97af97bbbb1",
              "status": "affected",
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              "versionType": "git"
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            },
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: fix signedness in this_len calculation\n\nWhen importing and using buffers, buf-\u003elen is considered unsigned.\nHowever, buf-\u003elen is converted to signed int when committing. This can\nlead to unexpected behavior if the buffer is large enough to be\ninterpreted as a negative value. Make min_t calculation unsigned."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:00:22.299Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39822",
    "datePublished": "2025-09-16T13:00:21.533Z",
    "dateReserved": "2025-04-16T07:20:57.139Z",
    "dateUpdated": "2025-09-29T06:00:22.299Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-5XMF-424G-JJHG

CVE-2025-39822 (GCVE-0-2025-39822)

Tags

Sightings

Nomenclature