CVE-2025-37926 (GCVE-0-2025-37926)
Vulnerability from cvelistv5
Published
2025-05-20 15:21
Modified
2026-08-05 11:58
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: fix use-after-free in ksmbd_session_rpc_open A UAF issue can occur due to a race condition between ksmbd_session_rpc_open() and __session_rpc_close(). Add rpc_lock to the session to protect it.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h"
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.1.162",
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              "version": "6.6.122",
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              "status": "unaffected",
              "version": "6.12.28",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.14.6",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.15",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in ksmbd_session_rpc_open\n\nA UAF issue can occur due to a race condition between\nksmbd_session_rpc_open() and __session_rpc_close().\nAdd rpc_lock to the session to protect it."
        }
      ],
      "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 listening on TCP/445; the entire attack consists of SMB2 CREATE and CLOSE PDUs sent over the network to the IPC$ share. No local access is needed at any point.\nAC:L - The attacker drives both sides of the race by pipelining concurrent SMB2 requests on one connection (ksmbd\u0027s workqueue has no per-connection serialization), and the race window spans a blocking userspace IPC round-trip of up to 2 seconds, while the target handle ID is a predictable small `ida_alloc()` value.\nPR:L - Reaching create_smb2_pipe() requires a completed SMB2 SESSION_SETUP and a TREE_CONNECT to IPC$, i.e. any valid low-privileged SMB account (or a guest account where mapping is enabled). This matches the scoring of the sibling ksmbd session UAFs CVE-2025-22040/CVE-2025-22041.\nUI:N - The attacker generates every request in the sequence; no action by a legitimate user or administrator is required to trigger the race.\nS:U - The corruption is confined to the kernel\u0027s own heap and the ksmbd server\u0027s data structures, all within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The success path returns `entry-\u003eid` read from freed slab memory and sends it back to the attacker as the CREATE response VolatileFileId, directly leaking reclaimed kernel heap contents, and the UAF/double-free of a small generic-cache object gives a spray-controlled read primitive.\nI:H - The error path double-frees the entry and calls ksmbd_rpc_id_free() on a stale IDA id now owned by a different live RPC handle, yielding freelist corruption and cross-handle aliasing that are classic stepping stones to arbitrary write and control-flow hijack in kernel context.\nA:H - Use-after-free and double-free of a kmalloc object reliably produce slab corruption, oops, or panic, and the attacker can repeat the race indefinitely over new sessions to crash the server."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:58:26.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a4348710a7267705b75692dc1a000920481d1d92"
        },
        {
          "url": "https://git.kernel.org/stable/c/1067361a1cc6ad9cdf7acfc47f90012b72ad1502"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fb3b6c85b7e3127161623586b62abcc366caa20"
        },
        {
          "url": "https://git.kernel.org/stable/c/6323fec65fe54b365961fed260dd579191e46121"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1f46c99d9ea411f9bf30025b912d881d36fc709"
        }
      ],
      "title": "ksmbd: fix use-after-free in ksmbd_session_rpc_open",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37926",
    "datePublished": "2025-05-20T15:21:53.359Z",
    "dateReserved": "2025-04-16T04:51:23.969Z",
    "dateUpdated": "2026-08-05T11:58:26.156Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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