CVE-2026-23474 (GCVE-0-2026-23474)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-04-18 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: Avoid boot crash in RedBoot partition table parser Given CONFIG_FORTIFY_SOURCE=y and a recent compiler, commit 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available") produces the warning below and an oops. Searching for RedBoot partition table in 50000000.flash at offset 0x7e0000 ------------[ cut here ]------------ WARNING: lib/string_helpers.c:1035 at 0xc029e04c, CPU#0: swapper/0/1 memcmp: detected buffer overflow: 15 byte read of buffer size 14 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0 #1 NONE As Kees said, "'names' is pointing to the final 'namelen' many bytes of the allocation ... 'namelen' could be basically any length at all. This fortify warning looks legit to me -- this code used to be reading beyond the end of the allocation." Since the size of the dynamic allocation is calculated with strlen() we can use strcmp() instead of memcmp() and remain within bounds.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/parsers/redboot.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
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              "version": "6.12.78",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
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              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "7.0",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: Avoid boot crash in RedBoot partition table parser\n\nGiven CONFIG_FORTIFY_SOURCE=y and a recent compiler,\ncommit 439a1bcac648 (\"fortify: Use __builtin_dynamic_object_size() when\navailable\") produces the warning below and an oops.\n\n    Searching for RedBoot partition table in 50000000.flash at offset 0x7e0000\n    ------------[ cut here ]------------\n    WARNING: lib/string_helpers.c:1035 at 0xc029e04c, CPU#0: swapper/0/1\n    memcmp: detected buffer overflow: 15 byte read of buffer size 14\n    Modules linked in:\n    CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0 #1 NONE\n\nAs Kees said, \"\u0027names\u0027 is pointing to the final \u0027namelen\u0027 many bytes\nof the allocation ... \u0027namelen\u0027 could be basically any length at all.\nThis fortify warning looks legit to me -- this code used to be reading\nbeyond the end of the allocation.\"\n\nSince the size of the dynamic allocation is calculated with strlen()\nwe can use strcmp() instead of memcmp() and remain within bounds."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:59:13.577Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ca235d11fc2fd8fce1dcd9d732dc780be0cde2de"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0065e106f798ce6862251bc4fc030ac5cead940"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b08be5aca212a99f8ba786fee4922feac08002c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8570211a2b1ec886a462daa0be4e9983ac768bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/2025b2d1f9d5cad6ea6fe85654c6c41297c3130b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/75a4d8cfe7784f909b3bd69325abac8e04ecb385"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e2f8020270af7777d49c2e7132260983e4fc566"
        }
      ],
      "title": "mtd: Avoid boot crash in RedBoot partition table parser",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23474",
    "datePublished": "2026-04-03T15:15:53.406Z",
    "dateReserved": "2026-01-13T15:37:46.022Z",
    "dateUpdated": "2026-04-18T08:59:13.577Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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