CVE-2026-46281 (GCVE-0-2026-46281)
Vulnerability from cvelistv5
Published
2026-06-08 15:41
Modified
2026-06-14 18:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vmalloc: fix buffer overflow in vrealloc_node_align() Commit 4c5d3365882d ("mm/vmalloc: allow to set node and align in vrealloc") added the ability to force a new allocation if the current pointer is on the wrong NUMA node, or if an alignment constraint is not met, even if the user is shrinking the allocation. On this path (need_realloc), the code allocates a new object of 'size' bytes and then memcpy()s 'old_size' bytes into it. If the request is to shrink the object (size < old_size), this results in an out-of-bounds write on the new buffer. Fix this by bounding the copy length by the new allocation size.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4c5d3365882dbbc0784688784904f440d7a4c0f1
Version: 4c5d3365882dbbc0784688784904f440d7a4c0f1
Version: 4c5d3365882dbbc0784688784904f440d7a4c0f1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/vmalloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9b057a44deff4c59c13f44672a5cc74dcd57522",
              "status": "affected",
              "version": "4c5d3365882dbbc0784688784904f440d7a4c0f1",
              "versionType": "git"
            },
            {
              "lessThan": "b281adf71f786c325eb6d6d1582d4d05313438a8",
              "status": "affected",
              "version": "4c5d3365882dbbc0784688784904f440d7a4c0f1",
              "versionType": "git"
            },
            {
              "lessThan": "82d1f01292d3f09bf063f829f8ab8de12b4280a1",
              "status": "affected",
              "version": "4c5d3365882dbbc0784688784904f440d7a4c0f1",
              "versionType": "git"
            }
          ]
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "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": "6.18.27",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvmalloc: fix buffer overflow in vrealloc_node_align()\n\nCommit 4c5d3365882d (\"mm/vmalloc: allow to set node and align in\nvrealloc\") added the ability to force a new allocation if the current\npointer is on the wrong NUMA node, or if an alignment constraint is not\nmet, even if the user is shrinking the allocation.\n\nOn this path (need_realloc), the code allocates a new object of \u0027size\u0027\nbytes and then memcpy()s \u0027old_size\u0027 bytes into it.  If the request is to\nshrink the object (size \u003c old_size), this results in an out-of-bounds\nwrite on the new buffer.\n\nFix this by bounding the copy length by the new allocation size."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:06:05.046Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e9b057a44deff4c59c13f44672a5cc74dcd57522"
        },
        {
          "url": "https://git.kernel.org/stable/c/b281adf71f786c325eb6d6d1582d4d05313438a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/82d1f01292d3f09bf063f829f8ab8de12b4280a1"
        }
      ],
      "title": "vmalloc: fix buffer overflow in vrealloc_node_align()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46281",
    "datePublished": "2026-06-08T15:41:24.168Z",
    "dateReserved": "2026-05-13T15:03:33.110Z",
    "dateUpdated": "2026-06-14T18:06:05.046Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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