{"id":"CVE-2026-98775","summary":"nitro_enclaves: fix use-after-free on SLOT_ALLOC failure","details":"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()'d 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.","modified":"2026-10-19T02:47:21.102244106Z","published":"2026-10-18T15:48:11.317Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98775.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43f78b328f3907ca2f7424e15b7e45ffbf9fe21c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/466041d14f26dc2babd606a2e85dce08774112a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9bc184a2eda8b773c88ecbff934001ad649b9cc1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98775.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98775"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799"},{"fixed":"466041d14f26dc2babd606a2e85dce08774112a6"},{"fixed":"f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84"},{"fixed":"43f78b328f3907ca2f7424e15b7e45ffbf9fe21c"},{"fixed":"9bc184a2eda8b773c88ecbff934001ad649b9cc1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98775.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98775.json"}}],"schema_version":"1.9.0"}