Vulnerability-Lookup

GHSA-8HVC-93QX-9Q29

Vulnerability from github – Published: 2025-12-24 12:30 – Updated: 2026-08-04 12:34

Details

In the Linux kernel, the following vulnerability has been resolved:

SMB3: Add missing locks to protect deferred close file list

cifs_del_deferred_close function has a critical section which modifies the deferred close file list. We must acquire deferred_lock before calling cifs_del_deferred_close function.

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-2023-53990"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:15:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSMB3: Add missing locks to protect deferred close file list\n\ncifs_del_deferred_close function has a critical section which modifies\nthe deferred close file list. We must acquire deferred_lock before\ncalling cifs_del_deferred_close function.",
  "id": "GHSA-8hvc-93qx-9q29",
  "modified": "2026-08-04T12:34:43Z",
  "published": "2025-12-24T12:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53990"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f87e18203bd30f71eb1a65259e28e291b6cc43a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32a046ccaeea6c19965c04a4c521e703f6607924"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3aa9d065b0685b4e6052f3f2a2462966fdc44fd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab9ddc87a9055c4bebd6524d5d761d605d52e557"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb36365dac25d546ca4af0eb22acb43c9b4ddfdf"
    }
  ],
  "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-2023-53990 (GCVE-0-2023-53990)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2026-08-05 09:16

Title

SMB3: Add missing locks to protect deferred close file list

Summary

In the Linux kernel, the following vulnerability has been resolved: SMB3: Add missing locks to protect deferred close file list cifs_del_deferred_close function has a critical section which modifies the deferred close file list. We must acquire deferred_lock before calling cifs_del_deferred_close function.

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

5 references

URL	Tags
https://git.kernel.org/stable/c/0f87e18203bd30f71…
https://git.kernel.org/stable/c/3aa9d065b0685b4e6…
https://git.kernel.org/stable/c/cb36365dac25d546c…
https://git.kernel.org/stable/c/32a046ccaeea6c199…
https://git.kernel.org/stable/c/ab9ddc87a9055c4be…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 860efae127888ae535bc4eda1b7f27642727c69e , < 0f87e18203bd30f71eb1a65259e28e291b6cc43a (git) Affected: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde , < 3aa9d065b0685b4e6052f3f2a2462966fdc44fd2 (git) Affected: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde , < cb36365dac25d546ca4af0eb22acb43c9b4ddfdf (git) Affected: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde , < 32a046ccaeea6c19965c04a4c521e703f6607924 (git) Affected: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde , < ab9ddc87a9055c4bebd6524d5d761d605d52e557 (git) Affected: 60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5 (git) Affected: 5.15.63 , < 5.15.111 (semver) Affected: 5.19.4 , < 5.20 (semver)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 5.15.111 , ≤ 5.15.* (semver) Unaffected: 6.1.28 , ≤ 6.1.* (semver) Unaffected: 6.2.15 , ≤ 6.2.* (semver) Unaffected: 6.3.2 , ≤ 6.3.* (semver) Unaffected: 6.4 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0f87e18203bd30f71eb1a65259e28e291b6cc43a",
              "status": "affected",
              "version": "860efae127888ae535bc4eda1b7f27642727c69e",
              "versionType": "git"
            },
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              "lessThan": "3aa9d065b0685b4e6052f3f2a2462966fdc44fd2",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "cb36365dac25d546ca4af0eb22acb43c9b4ddfdf",
              "status": "affected",
              "version": "ca08d0eac020d48a3141dbec0a3cf64fbdb17cde",
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              "lessThan": "32a046ccaeea6c19965c04a4c521e703f6607924",
              "status": "affected",
              "version": "ca08d0eac020d48a3141dbec0a3cf64fbdb17cde",
              "versionType": "git"
            },
            {
              "lessThan": "ab9ddc87a9055c4bebd6524d5d761d605d52e557",
              "status": "affected",
              "version": "ca08d0eac020d48a3141dbec0a3cf64fbdb17cde",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.111",
              "status": "affected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThan": "5.20",
              "status": "affected",
              "version": "5.19.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
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            "fs/cifs/misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.28",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.111",
                  "versionStartIncluding": "5.15.63",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.28",
                  "versionStartIncluding": "6.0",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                  "versionEndExcluding": "6.4",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.19.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSMB3: Add missing locks to protect deferred close file list\n\ncifs_del_deferred_close function has a critical section which modifies\nthe deferred close file list. We must acquire deferred_lock before\ncalling cifs_del_deferred_close function."
        }
      ],
      "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 - This is the SMB client (fs/cifs/), and the race is driven by local syscalls \u2014 open(2)/close(2) racing against unlink(2)/rename(2) on a mounted CIFS/SMB3 share. No network peer input is needed to trigger the unlocked list manipulation.\nAC:L - The attacker controls both sides of the race entirely, spawning one thread looping open/close and another looping rename/unlink on the same share, and can retry indefinitely. The only precondition \u2014 an RHW lease enabling deferred closes \u2014 is the default behavior of Samba/Windows servers and can be guaranteed by pointing the mount at an attacker-controlled server.\nPR:L - Only an unprivileged local user with access to an already-mounted CIFS share is needed; cifs_unlink(), cifs_rename2(), cifs_open() and cifs_close() perform no capability checks on the path to cifs_del_deferred_close(). The mount itself is a normal environmental condition in enterprise, container, and desktop deployments.\nUI:N - The attacker performs all the racing file operations itself with no victim involvement; the presence of the mount is an environmental precondition rather than an action the exploit must induce a user to take.\nS:U - The corruption is confined to kernel slab memory managed by the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Unsynchronized list_del plus kfree of struct cifs_deferred_close against concurrent list_add/list_del yields a double-free and use-after-free on a shared kmalloc-64 slab, and cifs_is_deferred_close() walks the list while it is being freed, giving an attacker who reclaims the object an arbitrary kernel-memory read primitive.\nI:H - The double-free of a 48-byte object in a general-purpose slab cache is a classic heap-spray primitive allowing the attacker to reclaim the chunk with an attacker-controlled structure and obtain an arbitrary write, and the corrupted list_head permits controlled writes via subsequent list_del operations.\nA:H - Even without full exploitation, concurrent list_del on the deferred_closes list corrupts list pointers and double-frees memory, producing list_del corruption BUG()s, KASAN splats, and kernel panics that are repeatedly triggerable by any local user with share access."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:31.988Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/0f87e18203bd30f71eb1a65259e28e291b6cc43a"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/ab9ddc87a9055c4bebd6524d5d761d605d52e557"
        }
      ],
      "title": "SMB3: Add missing locks to protect deferred close file list",
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        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53990",
    "datePublished": "2025-12-24T10:55:29.156Z",
    "dateReserved": "2025-12-24T10:53:46.175Z",
    "dateUpdated": "2026-08-05T09:16:31.988Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.