{"schema":"threatline.record/2","record":{"id":"CVE-2026-98775","aliases":[],"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->slot_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->private_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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","lessThan":"8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2","status":"affected","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","lessThan":"466041d14f26dc2babd606a2e85dce08774112a6","status":"affected","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","lessThan":"f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84","status":"affected","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","lessThan":"43f78b328f3907ca2f7424e15b7e45ffbf9fe21c","status":"affected","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","lessThan":"9bc184a2eda8b773c88ecbff934001ad649b9cc1","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"466041d14f26dc2babd606a2e85dce08774112a6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"43f78b328f3907ca2f7424e15b7e45ffbf9fe21c","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","source_modified_at":"2026-10-21T12:56:49.609Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9bc184a2eda8b773c88ecbff934001ad649b9cc1","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05748,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:11.317Z","modified_at":"2026-10-21T12:56:49.609Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98775","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:56:49.609Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98775","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/466041d14f26dc2babd606a2e85dce08774112a6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/43f78b328f3907ca2f7424e15b7e45ffbf9fe21c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9bc184a2eda8b773c88ecbff934001ad649b9cc1"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:56:49.609Z","content_hash":"52d3986b784c6f9229255710e751d4392a41428c19e8404090918e62dab32327"}}