cve-2021-47482
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-11-04 12:06
Summary
net: batman-adv: fix error handling
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


{
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        "metrics": [
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              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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            "other": {
              "content": {
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                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-22T14:23:49.834451Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-544",
                "description": "CWE-544 Missing Standardized Error Handling Mechanism",
                "lang": "en",
                "type": "CWE"
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/bridge_loop_avoidance.c",
            "net/batman-adv/main.c",
            "net/batman-adv/network-coding.c",
            "net/batman-adv/translation-table.c"
          ],
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          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
            "net/batman-adv/bridge_loop_avoidance.c",
            "net/batman-adv/main.c",
            "net/batman-adv/network-coding.c",
            "net/batman-adv/translation-table.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.38"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.289",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.254",
              "versionType": "semver"
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              "lessThanOrEqual": "4.19.*",
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              "version": "4.19.215",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.157",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.77",
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            },
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              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.16",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
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      ],
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: batman-adv: fix error handling\n\nSyzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was\nin wrong error handling in batadv_mesh_init().\n\nBefore this patch batadv_mesh_init() was calling batadv_mesh_free() in case\nof any batadv_*_init() calls failure. This approach may work well, when\nthere is some kind of indicator, which can tell which parts of batadv are\ninitialized; but there isn\u0027t any.\n\nAll written above lead to cleaning up uninitialized fields. Even if we hide\nODEBUG warning by initializing bat_priv-\u003enc.work, syzbot was able to hit\nGPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1]\n\nTo fix these bugs we can unwind batadv_*_init() calls one by one.\nIt is good approach for 2 reasons: 1) It fixes bugs on error handling\npath 2) It improves the performance, since we won\u0027t call unneeded\nbatadv_*_free() functions.\n\nSo, this patch makes all batadv_*_init() clean up all allocated memory\nbefore returning with an error to no call correspoing batadv_*_free()\nand open-codes batadv_mesh_free() with proper order to avoid touching\nuninitialized fields."
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        "dateUpdated": "2024-11-04T12:06:47.202Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47482",
    "datePublished": "2024-05-22T08:19:34.174Z",
    "dateReserved": "2024-05-22T06:20:56.200Z",
    "dateUpdated": "2024-11-04T12:06:47.202Z",
    "state": "PUBLISHED"
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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