Vulnerability-Lookup

GHSA-VFHM-MC4C-75C8

Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-09-22 21:30

Details

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

uaccess: fix integer overflow on access_ok()

Three architectures check the end of a user access against the address limit without taking a possible overflow into account. Passing a negative length or another overflow in here returns success when it should not.

Use the most common correct implementation here, which optimizes for a constant 'size' argument, and turns the common case into a single comparison.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49289"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuaccess: fix integer overflow on access_ok()\n\nThree architectures check the end of a user access against the\naddress limit without taking a possible overflow into account.\nPassing a negative length or another overflow in here returns\nsuccess when it should not.\n\nUse the most common correct implementation here, which optimizes\nfor a constant \u0027size\u0027 argument, and turns the common case into a\nsingle comparison.",
  "id": "GHSA-vfhm-mc4c-75c8",
  "modified": "2025-09-22T21:30:16Z",
  "published": "2025-09-22T21:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49289"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/222ca305c9fd39e5ed8104da25c09b2b79a516a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99801e2f457824955da4aadaa035913a6dede03a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1ad747fc1a0e06d1bf26b996ee8a56b5c8d02d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e65d28d4e9bf90a35ba79c06661a572a38391dec"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49289 (GCVE-0-2022-49289)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:56 – Updated: 2026-08-05 08:54

Title

uaccess: fix integer overflow on access_ok()

Summary

In the Linux kernel, the following vulnerability has been resolved: uaccess: fix integer overflow on access_ok() Three architectures check the end of a user access against the address limit without taking a possible overflow into account. Passing a negative length or another overflow in here returns success when it should not. Use the most common correct implementation here, which optimizes for a constant 'size' argument, and turns the common case into a single comparison.

Severity

7.8 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e65d28d4e9bf90a35…
https://git.kernel.org/stable/c/99801e2f457824955…
https://git.kernel.org/stable/c/a1ad747fc1a0e06d1…
https://git.kernel.org/stable/c/222ca305c9fd39e5e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7567746e1c0d66ac0ef8a9d8816ca694462c7370 , < e65d28d4e9bf90a35ba79c06661a572a38391dec (git) Affected: 7567746e1c0d66ac0ef8a9d8816ca694462c7370 , < 99801e2f457824955da4aadaa035913a6dede03a (git) Affected: 7567746e1c0d66ac0ef8a9d8816ca694462c7370 , < a1ad747fc1a0e06d1bf26b996ee8a56b5c8d02d8 (git) Affected: 7567746e1c0d66ac0ef8a9d8816ca694462c7370 , < 222ca305c9fd39e5ed8104da25c09b2b79a516a8 (git)
Linux	Linux	Affected: 3.2 Unaffected: 0 , < 3.2 (semver) Unaffected: 5.15.32 , ≤ 5.15.* (semver) Unaffected: 5.16.18 , ≤ 5.16.* (semver) Unaffected: 5.17.1 , ≤ 5.17.* (semver) Unaffected: 5.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/include/asm/uaccess.h",
            "arch/hexagon/include/asm/uaccess.h",
            "arch/microblaze/include/asm/uaccess.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e65d28d4e9bf90a35ba79c06661a572a38391dec",
              "status": "affected",
              "version": "7567746e1c0d66ac0ef8a9d8816ca694462c7370",
              "versionType": "git"
            },
            {
              "lessThan": "99801e2f457824955da4aadaa035913a6dede03a",
              "status": "affected",
              "version": "7567746e1c0d66ac0ef8a9d8816ca694462c7370",
              "versionType": "git"
            },
            {
              "lessThan": "a1ad747fc1a0e06d1bf26b996ee8a56b5c8d02d8",
              "status": "affected",
              "version": "7567746e1c0d66ac0ef8a9d8816ca694462c7370",
              "versionType": "git"
            },
            {
              "lessThan": "222ca305c9fd39e5ed8104da25c09b2b79a516a8",
              "status": "affected",
              "version": "7567746e1c0d66ac0ef8a9d8816ca694462c7370",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/include/asm/uaccess.h",
            "arch/hexagon/include/asm/uaccess.h",
            "arch/microblaze/include/asm/uaccess.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "lessThan": "3.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.32",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.32",
                  "versionStartIncluding": "3.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.18",
                  "versionStartIncluding": "3.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.1",
                  "versionStartIncluding": "3.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "3.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuaccess: fix integer overflow on access_ok()\n\nThree architectures check the end of a user access against the\naddress limit without taking a possible overflow into account.\nPassing a negative length or another overflow in here returns\nsuccess when it should not.\n\nUse the most common correct implementation here, which optimizes\nfor a constant \u0027size\u0027 argument, and turns the common case into a\nsingle comparison."
        }
      ],
      "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 arch-specific access_ok() used by syscall copy_to/from_user paths; an attacker needs local ability to invoke syscalls with crafted user pointers and lengths on csky, hexagon, or microblaze.\nAC:L - Triggering only requires passing an address and size that cause addr+size to wrap; no race, probabilistic memory layout, or other condition outside the attacker\u2019s control is needed.\nPR:L - Any unprivileged local user can reach access_ok() through ordinary read/write/ioctl and related syscalls that validate user buffers; no root or special capabilities are required.\nUI:N - Exploitation is fully attacker-driven via syscalls and does not require any action by another user.\nS:U - Impact is confined to the local kernel\u2019s security authority (same-host privilege boundary); this is not a VM escape, IOMMU bypass, or other cross-authority break.\nC:H - A successful access_ok() bypass lets copy_from_user read kernel addresses as if they were userspace, enabling arbitrary kernel memory disclosure when that data is returned to the attacker.\nI:H - The same bypass lets copy_to_user/clear_user write into kernel virtual addresses, yielding a kernel memory corruption / write primitive usable for control-flow hijacking.\nA:H - Walking into invalid or sensitive kernel mappings via the unchecked copy path can oops/panic the kernel, and huge overflowing lengths can also produce fatal DoS behavior."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:54:37.099Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e65d28d4e9bf90a35ba79c06661a572a38391dec"
        },
        {
          "url": "https://git.kernel.org/stable/c/99801e2f457824955da4aadaa035913a6dede03a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1ad747fc1a0e06d1bf26b996ee8a56b5c8d02d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/222ca305c9fd39e5ed8104da25c09b2b79a516a8"
        }
      ],
      "title": "uaccess: fix integer overflow on access_ok()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49289",
    "datePublished": "2025-02-26T01:56:27.026Z",
    "dateReserved": "2025-02-26T01:49:39.302Z",
    "dateUpdated": "2026-08-05T08:54:37.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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