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nitro_enclaves: fix use-after-free on SLOT_ALLOC failure

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98775

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98775

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9c8eb50fe9e2bb8a2e725979e052fbf592b6b799",
        "lessThan": "8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9c8eb50fe9e2bb8a2e725979e052fbf592b6b799",
        "lessThan": "466041d14f26dc2babd606a2e85dce08774112a6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9c8eb50fe9e2bb8a2e725979e052fbf592b6b799",
        "lessThan": "f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9c8eb50fe9e2bb8a2e725979e052fbf592b6b799",
        "lessThan": "43f78b328f3907ca2f7424e15b7e45ffbf9fe21c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9c8eb50fe9e2bb8a2e725979e052fbf592b6b799",
        "lessThan": "9bc184a2eda8b773c88ecbff934001ad649b9cc1",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/virt/nitro_enclaves/ne_misc_dev.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/virt/nitro_enclaves/ne_misc_dev.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98775

Source reference: /cveMetadata/cveId

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Event
#48968 · Revision 1
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