CVE-2026-98775 (GCVE-0-2026-98775)
Vulnerability from cvelistv5
Published
2026-10-18 15:48
Modified
2026-10-21 12:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nitro_enclaves: fix use-after-free on SLOT_ALLOC failure When ne_create_vm_ioctl() fails the SLOT_ALLOC request after anon_inode_getfile() has succeeded, the error path calls fput(enclave_file) and then frees ne_enclave. In normal userspace context, fput() defers the final __fput() via task_work. ne_enclave_release() therefore runs after ne_enclave has already been freed and dereferences ne_enclave->slot_uid, causing a use-after-free: KASAN: slab-use-after-free in ne_enclave_release. The enclave has no slot allocated and is not yet linked into the enclaves list on this error path, so ne_enclave_release() is expected to return early when slot_uid is zero. However, reading slot_uid already accesses the freed object. Clear enclave_file->private_data before fput() on the error path. ne_enclave_release() then returns immediately when private_data is NULL, leaving the ioctl error path as the sole owner of ne_enclave. This is safe because the file has not been fd_install()'d yet. Tested on an AWS EC2 m5.2xlarge with CONFIG_KASAN=y. Without the patch, the reproducer triggers a KASAN slab-use-after-free on every SLOT_ALLOC failure. With the patch, no KASAN report is produced and the SLOT_ALLOC error is still returned. Normal enclave creation and teardown are unaffected.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799
Version: 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799
Version: 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799
Version: 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799
Version: 9c8eb50fe9e2bb8a2e725979e052fbf592b6b799
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{
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          "programFiles": [
            "drivers/virt/nitro_enclaves/ne_misc_dev.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnitro_enclaves: fix use-after-free on SLOT_ALLOC failure\n\nWhen ne_create_vm_ioctl() fails the SLOT_ALLOC request after\nanon_inode_getfile() has succeeded, the error path calls\nfput(enclave_file) and then frees ne_enclave.\n\nIn normal userspace context, fput() defers the final __fput() via\ntask_work. ne_enclave_release() therefore runs after ne_enclave has\nalready been freed and dereferences ne_enclave-\u003eslot_uid, causing a\nuse-after-free: KASAN: slab-use-after-free in ne_enclave_release.\n\nThe enclave has no slot allocated and is not yet linked into the\nenclaves list on this error path, so ne_enclave_release() is expected\nto return early when slot_uid is zero. However, reading slot_uid\nalready accesses the freed object.\n\nClear enclave_file-\u003eprivate_data before fput() on the error path.\nne_enclave_release() then returns immediately when private_data is\nNULL, leaving the ioctl error path as the sole owner of ne_enclave.\nThis is safe because the file has not been fd_install()\u0027d yet.\n\nTested on an AWS EC2 m5.2xlarge with CONFIG_KASAN=y. Without the\npatch, the reproducer triggers a KASAN slab-use-after-free on every\nSLOT_ALLOC failure. With the patch, no KASAN report is produced and\nthe SLOT_ALLOC error is still returned. Normal enclave creation and\nteardown are unaffected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:56:49.609Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2"
        },
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          "url": "https://git.kernel.org/stable/c/466041d14f26dc2babd606a2e85dce08774112a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84"
        },
        {
          "url": "https://git.kernel.org/stable/c/43f78b328f3907ca2f7424e15b7e45ffbf9fe21c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bc184a2eda8b773c88ecbff934001ad649b9cc1"
        }
      ],
      "title": "nitro_enclaves: fix use-after-free on SLOT_ALLOC failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98775",
    "datePublished": "2026-10-18T15:48:11.317Z",
    "dateReserved": "2026-09-25T10:25:14.369Z",
    "dateUpdated": "2026-10-21T12:56:49.609Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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