CVE-2025-38092 (GCVE-0-2025-38092)
Vulnerability from cvelistv5
Published
2025-07-02 14:43
Modified
2026-08-05 11:59
Severity ?
8.8 (High) - CVSS:3.1/AV:N/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: ksmbd: use list_first_entry_or_null for opinfo_get_list() The list_first_entry() macro never returns NULL. If the list is empty then it returns an invalid pointer. Use list_first_entry_or_null() to check if the list is empty.
References
Impacted products
Vendor Product Version
Linux Linux Version: 296cb5457cc6f4a754c4ae29855f8a253d52bcc6
Version: d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
Version: d73686367ad68534257cd88a36ca3c52cb8b81d8
Version: 18b4fac5ef17f77fed9417d22210ceafd6525fc7
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   Linux Linux Version: 6.6.88   ≤
Version: 6.12.25   ≤
Version: 6.14.4   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c78abb646ff823e7d22faad4cc0703d4484da9e8",
              "status": "affected",
              "version": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6",
              "versionType": "git"
            },
            {
              "lessThan": "334da674b25fdb7a1a4d4b89dcd7795144fc7e11",
              "status": "affected",
              "version": "d54ab1520d43e95f9b2e22d7a05fc9614192e5a5",
              "versionType": "git"
            },
            {
              "lessThan": "cb7e06e9736d73007dc8dab7b353733bb37df86b",
              "status": "affected",
              "version": "d73686367ad68534257cd88a36ca3c52cb8b81d8",
              "versionType": "git"
            },
            {
              "lessThan": "10379171f346e6f61d30d9949500a8de4336444a",
              "status": "affected",
              "version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.6.93",
              "status": "affected",
              "version": "6.6.88",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.32",
              "status": "affected",
              "version": "6.12.25",
              "versionType": "semver"
            },
            {
              "lessThan": "6.14.10",
              "status": "affected",
              "version": "6.14.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.93",
                  "versionStartIncluding": "6.6.88",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.32",
                  "versionStartIncluding": "6.12.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.10",
                  "versionStartIncluding": "6.14.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use list_first_entry_or_null for opinfo_get_list()\n\nThe list_first_entry() macro never returns NULL.  If the list is\nempty then it returns an invalid pointer.  Use list_first_entry_or_null()\nto check if the list is empty."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ksmbd is the in-kernel SMB server; the vulnerable path is driven entirely by remote SMB2 CREATE, LOCK and CLOSE requests arriving on TCP/445 from a remote client. No local access is required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2 CREATE/LOCK and CLOSE requests on multiple connections against the same file, and the window is actively widened because down_read() in opinfo_get_list() blocks behind the racing opinfo_del() down_write() that empties the list.\nPR:L - Reaching smb_grant_oplock()/smb_break_all_oplock() requires an established SMB2 session, a tree connect and open file handles, so a valid (even low-privilege or guest-mapped) SMB account is needed; this is not a pre-authentication code path.\nUI:N - The attacker drives every step from its own SMB connections \u2014 opening handles with oplocks/leases and closing them concurrently. No action by any other user or administrator is needed.\nS:U - The type confusion corrupts kernel heap memory belonging to the ksmbd subsystem within the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The fake oplock_info causes reads through attacker-timed wild pointers \u2014 opinfo-\u003econn resolves to an rwsem waiter on another task\u0027s kernel stack and o_lease to an arbitrary kernel pointer \u2014 and such heap type confusion is leverageable into arbitrary kernel memory disclosure.\nI:H - atomic_inc_not_zero() performs a real RMW write onto the upper half of ksmbd_inode-\u003em_hash.pprev, corrupting a kernel pointer that hlist_del_init() later writes through, and follow-on oplock_break()/opinfo_put() paths add out-of-bounds wait-queue list writes and kfree() of interior pointers \u2014 classic type confusion promotable to a write primitive.\nA:H - Dereferencing and atomically modifying a bogus pointer derived from the list head, plus spinlock/wait-queue operations past the end of the kmalloc\u0027d ksmbd_inode, reliably produce slab corruption, oops or panic, taking down the file server host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:27.724Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c78abb646ff823e7d22faad4cc0703d4484da9e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/334da674b25fdb7a1a4d4b89dcd7795144fc7e11"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb7e06e9736d73007dc8dab7b353733bb37df86b"
        },
        {
          "url": "https://git.kernel.org/stable/c/10379171f346e6f61d30d9949500a8de4336444a"
        }
      ],
      "title": "ksmbd: use list_first_entry_or_null for opinfo_get_list()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38092",
    "datePublished": "2025-07-02T14:43:30.776Z",
    "dateReserved": "2025-04-16T04:51:23.983Z",
    "dateUpdated": "2026-08-05T11:59:27.724Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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