{"id":"CVE-2026-98775","state":"PUBLISHED","title":"nitro_enclaves: fix use-after-free on SLOT_ALLOC failure","description":"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.","publishedAt":"2026-10-18T15:48:11.317Z","updatedAt":"2026-10-30T12:39:42.932Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"718965a5fcea47f7ec6accff55306317aadc3af3","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"dac89ed976d9826eae4703281d0d51b062b58eef","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"8024c50b8763add7912b6d9830327ba73f994204","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"466041d14f26dc2babd606a2e85dce08774112a6","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"43f78b328f3907ca2f7424e15b7e45ffbf9fe21c","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"9bc184a2eda8b773c88ecbff934001ad649b9cc1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/virt/nitro_enclaves/ne_misc_dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/virt/nitro_enclaves/ne_misc_dev.c"]}],"references":["https://git.kernel.org/stable/c/718965a5fcea47f7ec6accff55306317aadc3af3","https://git.kernel.org/stable/c/dac89ed976d9826eae4703281d0d51b062b58eef","https://git.kernel.org/stable/c/8024c50b8763add7912b6d9830327ba73f994204","https://git.kernel.org/stable/c/8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2","https://git.kernel.org/stable/c/466041d14f26dc2babd606a2e85dce08774112a6","https://git.kernel.org/stable/c/f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84","https://git.kernel.org/stable/c/43f78b328f3907ca2f7424e15b7e45ffbf9fe21c","https://git.kernel.org/stable/c/9bc184a2eda8b773c88ecbff934001ad649b9cc1"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98775.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98775","state":"PUBLISHED","datePublished":"2026-10-18T15:48:11.317Z","dateUpdated":"2026-10-30T12:39:42.932Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.369Z"},"containers":{"cna":{"title":"nitro_enclaves: fix use-after-free on SLOT_ALLOC failure","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->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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"718965a5fcea47f7ec6accff55306317aadc3af3","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"dac89ed976d9826eae4703281d0d51b062b58eef","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"8024c50b8763add7912b6d9830327ba73f994204","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"466041d14f26dc2babd606a2e85dce08774112a6","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"f7fb6c2835ede1b8ad84cf7e78a528a9d0159b84","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"43f78b328f3907ca2f7424e15b7e45ffbf9fe21c","versionType":"git"},{"version":"9c8eb50fe9e2bb8a2e725979e052fbf592b6b799","status":"affected","lessThan":"9bc184a2eda8b773c88ecbff934001ad649b9cc1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/virt/nitro_enclaves/ne_misc_dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/virt/nitro_enclaves/ne_misc_dev.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/718965a5fcea47f7ec6accff55306317aadc3af3"},{"url":"https://git.kernel.org/stable/c/dac89ed976d9826eae4703281d0d51b062b58eef"},{"url":"https://git.kernel.org/stable/c/8024c50b8763add7912b6d9830327ba73f994204"},{"url":"https://git.kernel.org/stable/c/8bde6f643ab6fe5e3e3f4c312f84ce327ecf39b2"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:42.932Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}