CVE-2026-53160 (GCVE-0-2026-53160)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-08-05 12:33
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: misc: fastrpc: fix use-after-free race in fastrpc_map_create fastrpc_map_lookup returns a raw pointer after releasing fl->lock. The caller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero) on this unprotected pointer. A concurrent MEM_UNMAP can free the map between the lock release and the kref operation, resulting in a use-after-free on the freed slab object. Restore the take_ref parameter to fastrpc_map_lookup so the reference is acquired atomically under fl->lock before the pointer is exposed to the caller.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0b70ec82b309a4093106ff399da1911ad23b52d3
Version: d7513b47082c08105e837b06cebeb3f07a5fa56f
Version: 802359a52676176b18713e33caa17572ad009057
Version: 10df039834f84a297c72ec962c0f9b7c8c5ca31a
Version: 10df039834f84a297c72ec962c0f9b7c8c5ca31a
Version: 10df039834f84a297c72ec962c0f9b7c8c5ca31a
Version: f3f59bab68e9bc714f757ab22f3fb36153014043
Version: 6.1.156   ≤
Version: 6.6.112   ≤
Version: 6.12.53   ≤
Version: 6.17.3   ≤
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{
  "containers": {
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          "defaultStatus": "unaffected",
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          "programFiles": [
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          "vendor": "Linux",
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: fix use-after-free race in fastrpc_map_create\n\nfastrpc_map_lookup returns a raw pointer after releasing fl-\u003elock. The\ncaller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero)\non this unprotected pointer. A concurrent MEM_UNMAP can free the map\nbetween the lock release and the kref operation, resulting in a\nuse-after-free on the freed slab object.\n\nRestore the take_ref parameter to fastrpc_map_lookup so the reference\nis acquired atomically under fl-\u003elock before the pointer is exposed to\nthe caller."
        }
      ],
      "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 vulnerable code is reached through local FastRPC misc-device ioctls such as FASTRPC_IOCTL_MEM_MAP, FASTRPC_IOCTL_INVOKE, and FASTRPC_IOCTL_INIT_CREATE. There is no network or adjacent-path entry point.\nAC:L - The attacker can drive both sides of the race by issuing concurrent map-creating and MEM_UNMAP ioctls against the same FastRPC file context and DMA-buf fd. No condition outside attacker control is required beyond scheduling the race.\nPR:L - The ioctl path has no in-driver capable(), namespace capability, or credential check once the FastRPC device node is open. Exploitation requires local access to the device node as a basic user or device-authorized app, not real root.\nUI:N - No victim action is required after the attacker has local access. The attacker directly opens the FastRPC device and submits ioctls.\nS:U - This is a kernel memory safety bug in a local kernel driver and exploitation would affect the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation by itself.\nC:H - The bug is a use-after-free on struct fastrpc_map, a slab object containing pointers and DMA mapping state. Under the required high-severity rule, this memory corruption is treated as capable of enabling kernel information disclosure.\nI:H - The use-after-free can be raced with allocator reuse and involves refcount/list/DMA mapping state, making control of freed object contents plausibly exploitable for kernel memory corruption. Under the kernel guidance, UAFs receive high integrity impact.\nA:H - Even without full exploitation, racing kref_get_unless_zero() and later map-field use on a freed object can trigger kernel warnings, oopses, or crashes. Repeated local ioctls can therefore cause high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:35.015Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532"
        },
        {
          "url": "https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218"
        },
        {
          "url": "https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb"
        }
      ],
      "title": "misc: fastrpc: fix use-after-free race in fastrpc_map_create",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53160",
    "datePublished": "2026-06-25T08:38:42.138Z",
    "dateReserved": "2026-06-09T07:44:35.388Z",
    "dateUpdated": "2026-08-05T12:33:35.015Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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