{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bd9d6a3efa9709e653aafbeb859289feccb8e70c"
            },
            {
              "fixed": "f501f2f4ec1d2dfe39e21c98630314074a9b30b0"
            },
            {
              "fixed": "1aea0482b98ecd7d0249204665f2ad4ad517f66b"
            },
            {
              "fixed": "9b5f6475006cd8e3b5b99b8eb3cd74dbb1ce9df8"
            },
            {
              "fixed": "a71f161a857117e8e0264deb7d14fff5c98adcf5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93229.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add missing read barrier to rpc_status_get dumpit seqcount retry\n\nThe hand-rolled seqcount-like protocol in nfsd_nl_rpc_status_get_dumpit()\nis missing a read memory barrier (smp_rmb) before its second counter\ncheck.  The standard kernel read_seqcount_retry() includes smp_rmb()\nto ensure that all data reads complete before the counter is re-checked.\n\nWithout this barrier, on weakly-ordered architectures (ARM, POWER),\nthe CPU may reorder field reads past the second counter check, making\nthe retry logic ineffective: it could observe a consistent counter pair\nwhile reading fields that have been concurrently modified by the writer.\n\nAdd smp_rmb() before the second counter check to order the field reads\nahead of it, matching the barrier semantics of the standard seqcount\nread-side.  The begin-side smp_load_acquire() already pairs with the\nsmp_store_release() in nfsd_dispatch(); with the smp_rmb() now ordering\nthe field reads, the retry check no longer needs acquire semantics and\nreads the counter with a plain READ_ONCE(), as read_seqcount_retry()\ndoes.\n\n[ cel: Use READ_ONCE instead of smp_load_acquire() ]",
  "id": "CVE-2026-93229",
  "modified": "2026-09-26T03:30:40.324848413Z",
  "published": "2026-09-24T15:29:14.322Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1aea0482b98ecd7d0249204665f2ad4ad517f66b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b5f6475006cd8e3b5b99b8eb3cd74dbb1ce9df8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a71f161a857117e8e0264deb7d14fff5c98adcf5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f501f2f4ec1d2dfe39e21c98630314074a9b30b0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93229.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93229"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: add missing read barrier to rpc_status_get dumpit seqcount retry"
}