{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74330",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74330"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "configfs: fix lockless traversals of ->s_children",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix lockless traversals of ->s_children\n\nHaving the parent directory locked protects entries from removal\nby another thread, but it does *not* protect cursors from being\nmoved around by lseek() - or freed, for that matter.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74330"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/77fd6f50f633a52c2db061e7d71d8cb486b0265e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e57e2863872e82e7c7237bc32299f67ebebc543"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/459860529c109c5ce08b81c0776ca1200eaaeb4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/637ef4961470e04455102b34ac484a34d8eca0a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e6d93108e0a27d7e6f95c7e45017d14ba2900d32"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through local VFS syscalls (openat, getdents, lseek, close, mkdir, rmdir) against configfs, typically mounted at /sys/kernel/config; it is not reachable via network-facing kernel services such as ksmbd, nfsd, or packet-receive paths.\nAC:L - The attacker controls both sides of the race: opening a configfs directory inserts a readdir cursor into s_children, and concurrent lseek() or close() moves or frees that cursor while detach_attrs, detach_groups, or configfs_find_subsys_dentry traverse the list without configfs_dirent_lock; the window is attacker-driven and retryable.\nPR:L - Default configfs trees are root-owned, but 0755 directories let any local user open and lseek while teardown races proceed; USB gadget, target/LIO, gpio-aggregator, and embedded deployments commonly grant configfs mkdir/rmdir/write to service accounts or expose world-writable (S_IWUGO) gadget attributes.\nUI:N - Exploitation requires only the attacker issuing syscalls and spawning concurrent threads against configfs paths mounted at boot; no victim must mount filesystems, click prompts, or open files on the attacker's behalf.\nS:U - Slab use-after-free and list corruption impact kernel memory within the same security domain; this enables local privilege escalation, not VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Lockless s_children traversal can follow a freed readdir cursor (the fix commit notes cursors can be \"freed\"), dereferencing kmem_cache_freed configfs_dirent objects and yielding standard slab UAF read primitives over adjacent kernel heap contents.\nI:H - The dangling cursor and list corruption enable heap grooming to reclaim freed configfs_dirent slabs and convert the race into arbitrary kernel writes or control-flow hijack, not merely incorrect metadata updates.\nA:H - Concurrent cursor free or move during unlocked list iteration causes kernel oops or panic via invalid list pointers or UAF dereferences; the race is repeatable for sustained denial of service."
    }
  }
}