Vulnerability-Lookup

GHSA-X69C-VJ2Q-H6CH

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74330"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:33Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-x69c-vj2q-h6ch",
  "modified": "2026-08-17T06:33:39Z",
  "published": "2026-08-15T06:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74330"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/459860529c109c5ce08b81c0776ca1200eaaeb4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/637ef4961470e04455102b34ac484a34d8eca0a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77fd6f50f633a52c2db061e7d71d8cb486b0265e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e57e2863872e82e7c7237bc32299f67ebebc543"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6d93108e0a27d7e6f95c7e45017d14ba2900d32"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74330 (GCVE-0-2026-74330)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45

Title

configfs: fix lockless traversals of ->s_children

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/77fd6f50f633a52c2…
https://git.kernel.org/stable/c/91f289728ec706b7f…
https://git.kernel.org/stable/c/b166ab78dc3f48e83…
https://git.kernel.org/stable/c/9e57e2863872e82e7…
https://git.kernel.org/stable/c/459860529c109c5ce…
https://git.kernel.org/stable/c/637ef4961470e0445…
https://git.kernel.org/stable/c/e6d93108e0a27d7e6…
https://git.kernel.org/stable/c/9b9e8bb81c41fd27e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 77fd6f50f633a52c2db061e7d71d8cb486b0265e (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 91f289728ec706b7ff1ca0ee845dd73ff2253488 (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 9e57e2863872e82e7c7237bc32299f67ebebc543 (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 459860529c109c5ce08b81c0776ca1200eaaeb4a (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 637ef4961470e04455102b34ac484a34d8eca0a4 (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < e6d93108e0a27d7e6f95c7e45017d14ba2900d32 (git) Affected: 6f61076406251626be39651d114fac412b1e0c39 , < 9b9e8bb81c41fd27e7b57a1c936fde140548535f (git)
Linux	Linux	Affected: 2.6.27 Unaffected: 0 , < 2.6.27 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "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"
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              "status": "affected",
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              "versionType": "git"
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              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6f61076406251626be39651d114fac412b1e0c39",
              "versionType": "git"
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              "status": "affected",
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.27"
            },
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              "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"
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            {
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              "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": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.27",
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                },
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                {
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                  "versionStartIncluding": "2.6.27",
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        {
          "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": [
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          "url": "https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488"
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        },
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        {
          "url": "https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f"
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      "title": "configfs: fix lockless traversals of -\u003es_children",
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    "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": "2026-08-17T05:45:56.848Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-X69C-VJ2Q-H6CH

CVE-2026-74330 (GCVE-0-2026-74330)

Tags

Sightings

Nomenclature