CVE-2023-53990 (GCVE-0-2023-53990)
Vulnerability from cvelistv5
Published
2025-12-24 10:55
Modified
2026-08-05 09:16
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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 860efae127888ae535bc4eda1b7f27642727c69e
Version: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde
Version: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde
Version: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde
Version: ca08d0eac020d48a3141dbec0a3cf64fbdb17cde
Version: 60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5
Version: 5.15.63   ≤
Version: 5.19.4   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/misc.c"
          ],
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "status": "unaffected",
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              "version": "6.3.2",
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              "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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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f87e18203bd30f71eb1a65259e28e291b6cc43a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3aa9d065b0685b4e6052f3f2a2462966fdc44fd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb36365dac25d546ca4af0eb22acb43c9b4ddfdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/32a046ccaeea6c19965c04a4c521e703f6607924"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab9ddc87a9055c4bebd6524d5d761d605d52e557"
        }
      ],
      "title": "SMB3: Add missing locks to protect deferred close file list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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