CVE-2025-38595 (GCVE-0-2025-38595)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2025-09-29 05:54
VLAI?
Title
xen: fix UAF in dmabuf_exp_from_pages()
Summary
In the Linux kernel, the following vulnerability has been resolved: xen: fix UAF in dmabuf_exp_from_pages() [dma_buf_fd() fixes; no preferences regarding the tree it goes through - up to xen folks] As soon as we'd inserted a file reference into descriptor table, another thread could close it. That's fine for the case when all we are doing is returning that descriptor to userland (it's a race, but it's a userland race and there's nothing the kernel can do about it). However, if we follow fd_install() with any kind of access to objects that would be destroyed on close (be it the struct file itself or anything destroyed by its ->release()), we have a UAF. dma_buf_fd() is a combination of reserving a descriptor and fd_install(). gntdev dmabuf_exp_from_pages() calls it and then proceeds to access the objects destroyed on close - starting with gntdev_dmabuf itself. Fix that by doing reserving descriptor before anything else and do fd_install() only when everything had been set up.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a240d6e42e28c34fdc34b3a98ca838a31c939901 , < e5907885260401bba300d4d18d79875c05b82651 (git)
Affected: a240d6e42e28c34fdc34b3a98ca838a31c939901 , < 3edfd2353f301bfffd5ee41066e37320a59ccc2d (git)
Affected: a240d6e42e28c34fdc34b3a98ca838a31c939901 , < d59d49af4aeed9a81e673e37c26c6a3bacf1a181 (git)
Affected: a240d6e42e28c34fdc34b3a98ca838a31c939901 , < 532c8b51b3a8676cbf533a291f8156774f30ea87 (git)
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    Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/gntdev-dmabuf.c"
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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\nxen: fix UAF in dmabuf_exp_from_pages()\n\n[dma_buf_fd() fixes; no preferences regarding the tree it goes through -\nup to xen folks]\n\nAs soon as we\u0027d inserted a file reference into descriptor table, another\nthread could close it.  That\u0027s fine for the case when all we are doing is\nreturning that descriptor to userland (it\u0027s a race, but it\u0027s a userland\nrace and there\u0027s nothing the kernel can do about it).  However, if we\nfollow fd_install() with any kind of access to objects that would be\ndestroyed on close (be it the struct file itself or anything destroyed\nby its -\u003erelease()), we have a UAF.\n\ndma_buf_fd() is a combination of reserving a descriptor and fd_install().\ngntdev dmabuf_exp_from_pages() calls it and then proceeds to access the\nobjects destroyed on close - starting with gntdev_dmabuf itself.\n\nFix that by doing reserving descriptor before anything else and do\nfd_install() only when everything had been set up."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:54:28.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/e5907885260401bba300d4d18d79875c05b82651"
        },
        {
          "url": "https://git.kernel.org/stable/c/3edfd2353f301bfffd5ee41066e37320a59ccc2d"
        },
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          "url": "https://git.kernel.org/stable/c/d59d49af4aeed9a81e673e37c26c6a3bacf1a181"
        },
        {
          "url": "https://git.kernel.org/stable/c/532c8b51b3a8676cbf533a291f8156774f30ea87"
        }
      ],
      "title": "xen: fix UAF in dmabuf_exp_from_pages()",
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38595",
    "datePublished": "2025-08-19T17:03:25.527Z",
    "dateReserved": "2025-04-16T04:51:24.028Z",
    "dateUpdated": "2025-09-29T05:54:28.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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