fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

{
  "id": "c5d51297e2c51af5bbf896e07617a93bfdb97621c542739a425f2122692f525e",
  "url": "https://osv.dev/vulnerability/CVE-2023-52779",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs: Pass AT_GETATTR_NOSEC flag to getattr interface function",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs: Pass AT_GETATTR_NOSEC flag to getattr interface function When vfs_getattr_nosec() calls a filesystem's getattr interface function then the 'nosec' should propagate into this function so that vfs_getattr_nosec() can again be called from the filesystem's gettattr rather than vfs_getattr(). The latter would add unnecessary security checks that the initial vfs_getattr_nosec() call wanted to avoid. Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass with the new getattr_flags parameter to the getattr interface function. In overlayfs and ecryptfs use this flag to determine which one of the two functions to call. In a recent code change introduced to IMA vfs_getattr_nosec() ended up calling vfs_getattr() in overlayfs, which in turn called security_inode_getattr() on an exiting process that did not have current->fs set anymore, which then caused a kernel NULL pointer dereference. With this change the call to security_inode_getattr() can be avoided, thus avoiding the NULL pointer dereference.",
    "evidence": "osv:CVE-2023-52779",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-52779",
      "aliases": [
        "CVE-2023-52779"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7"
                },
                {
                  "fixed": "3fb0fa08641903304b9d81d52a379ff031dc41d4"
                },
                {
                  "fixed": "8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52779.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
                },
                {
                  "fixed": "6.6.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52779.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.324492378Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4",
        "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52779.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52779",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52779.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-52779",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488455,
  "published_at": "2024-05-21T15:30:58.899+00:00"
}