CVE-2026-74330 (GCVE-0-2026-74330)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-10-16 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: configfs: fix lockless traversals of ->s_children Having the parent directory locked protects entries from removal by another thread, but it does *not* protect cursors from being moved around by lseek() - or freed, for that matter.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
Version: 6f61076406251626be39651d114fac412b1e0c39
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-74330",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T18:53:38.426729Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T18:55:33.381Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "77fd6f50f633a52c2db061e7d71d8cb486b0265e",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "91f289728ec706b7ff1ca0ee845dd73ff2253488",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "9e57e2863872e82e7c7237bc32299f67ebebc543",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "459860529c109c5ce08b81c0776ca1200eaaeb4a",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "637ef4961470e04455102b34ac484a34d8eca0a4",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "e6d93108e0a27d7e6f95c7e45017d14ba2900d32",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
              "lessThan": "9b9e8bb81c41fd27e7b57a1c936fde140548535f",
              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "lessThan": "2.6.27",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix lockless traversals of -\u003es_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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:56.848Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/77fd6f50f633a52c2db061e7d71d8cb486b0265e"
        },
        {
          "url": "https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488"
        },
        {
          "url": "https://git.kernel.org/stable/c/b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e57e2863872e82e7c7237bc32299f67ebebc543"
        },
        {
          "url": "https://git.kernel.org/stable/c/459860529c109c5ce08b81c0776ca1200eaaeb4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/637ef4961470e04455102b34ac484a34d8eca0a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6d93108e0a27d7e6f95c7e45017d14ba2900d32"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f"
        }
      ],
      "title": "configfs: fix lockless traversals of -\u003es_children",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74330",
    "datePublished": "2026-08-15T05:58:23.722Z",
    "dateReserved": "2026-08-15T05:44:03.885Z",
    "dateUpdated": "2026-10-16T18:55:33.381Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-74330\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T18:53:38.426729Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T18:53:39.559Z\"}}], \"cna\": {\"title\": \"configfs: fix lockless traversals of -\u003es_children\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"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\u0027s 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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"77fd6f50f633a52c2db061e7d71d8cb486b0265e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"91f289728ec706b7ff1ca0ee845dd73ff2253488\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"9e57e2863872e82e7c7237bc32299f67ebebc543\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"459860529c109c5ce08b81c0776ca1200eaaeb4a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"637ef4961470e04455102b34ac484a34d8eca0a4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"e6d93108e0a27d7e6f95c7e45017d14ba2900d32\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f61076406251626be39651d114fac412b1e0c39\", \"lessThan\": \"9b9e8bb81c41fd27e7b57a1c936fde140548535f\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/configfs/dir.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.27\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.27\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/configfs/dir.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/77fd6f50f633a52c2db061e7d71d8cb486b0265e\"}, {\"url\": \"https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488\"}, {\"url\": \"https://git.kernel.org/stable/c/b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb\"}, {\"url\": \"https://git.kernel.org/stable/c/9e57e2863872e82e7c7237bc32299f67ebebc543\"}, {\"url\": \"https://git.kernel.org/stable/c/459860529c109c5ce08b81c0776ca1200eaaeb4a\"}, {\"url\": \"https://git.kernel.org/stable/c/637ef4961470e04455102b34ac484a34d8eca0a4\"}, {\"url\": \"https://git.kernel.org/stable/c/e6d93108e0a27d7e6f95c7e45017d14ba2900d32\"}, {\"url\": \"https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nconfigfs: fix lockless traversals of -\u003es_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:45:56.848Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74330\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:33.381Z\", \"dateReserved\": \"2026-08-15T05:44:03.885Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:58:23.722Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.