{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7e46fa64a4b94208563c3a5bf1d7f4346f94abea",
              "status": "affected",
              "version": "270172f64b114451876c1b68912653e72ab99f38",
              "versionType": "git"
            },
            {
              "lessThan": "145832fbdd17b1d77ffd6cdd1642259e101d1b7e",
              "status": "affected",
              "version": "270172f64b114451876c1b68912653e72ab99f38",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.2",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/migrate: prevent potential UAF\n\nIf we hit the error path, the previous fence (if there is one) has\nalready been put() prior to this, so doing a fence_wait could lead to\nUAF. Tweak the flow to do to the put() until after we do the wait.\n\n(cherry picked from commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)"
        }
      ],
      "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 loop is reached only through a local userspace mapping of an Intel Xe VRAM buffer object accessed via ptrace//proc/pid/mem/process_vm_readv, or via the local devcoredump snapshot path after a GPU hang. There is no network or adjacent-network exposure.\nAC:L - The attacker deterministically forces multiple loop iterations by choosing the access offset/length against a fragmented VRAM BO (or a large VM snapshot), and forces the error path by saturating the fixed-size kernel_bb_pool and signalling the waiting thread, since drm_suballoc_insert waits interruptibly and returns -ERESTARTSYS. Concurrent migrate traffic that replaces m-\u003efence and drops the last reference is likewise generated by the attacker\u0027s own GPU submissions.\nPR:L - Only an unprivileged local user with DRM render-node access (render group, logged-in desktop user, or Android graphics group) is needed to create and mmap a VRAM BO and ptrace its own process. No root, capability, or namespace escalation is required.\nUI:N - The attacker performs the BO creation, mapping, GPU load generation, and the triggering remote-memory access entirely within its own processes. No action by any other user is required.\nS:U - The freed dma_fence and any resulting corruption stay within the host kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - dma_fence_wait() on the freed fence dereferences fence-\u003eops, fence-\u003elock and fence-\u003eseqno from reclaimed slab memory, and the attacker can refill that slot with objects of its choosing by submitting more scheduler jobs, yielding an arbitrary kernel-memory read primitive.\nI:H - The same wait path writes into the freed object (list_add on cb_list, setting the ENABLE_SIGNAL flag) and performs an indirect call through fence-\u003eops, so a heap-sprayed replacement gives both a write primitive and control-flow hijack leading to privilege escalation.\nA:H - Even without successful exploitation the use-after-free reliably produces a KASAN splat/oops, and waiting on a fence that will never signal hangs the calling task while holding the BO reservation, denying service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:57.846Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7e46fa64a4b94208563c3a5bf1d7f4346f94abea"
        },
        {
          "url": "https://git.kernel.org/stable/c/145832fbdd17b1d77ffd6cdd1642259e101d1b7e"
        }
      ],
      "title": "drm/xe/migrate: prevent potential UAF",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39740",
    "datePublished": "2025-09-11T16:52:14.638Z",
    "dateReserved": "2025-04-16T07:20:57.120Z",
    "dateUpdated": "2026-08-05T12:04:57.846Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}