# CVE-2026-98775: nitro_enclaves: fix use-after-free on SLOT_ALLOC failure CVE-2026-98775 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-98775, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-98775 - Priority: Routine - CVSS: 6.5 (Moderate) - EPSS: 0.0018 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 12, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98775 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | bpftool6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | bpftool6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-devel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-headers amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.1.188-233.393 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.12.111-136.204 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel-livepatch-6.18.56-125.164 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | kernel6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98775](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98775.md) | Oct 19, 2026 | | Linux | linux Debian 14 | 7.2.10-1 | [DEBIAN-CVE-2026-98775](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98775.md) | Oct 19, 2026 | | Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-98775](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98775.md) | Oct 19, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | perf amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | perf6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | python3-perf amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.188-233.393.amzn2023 | [ALAS2023-2026-3183](https://patchblox.com/security/data/fix/linux/alas2023-2026-3183.md) | Nov 7, 2026 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.111-136.204.amzn2023 | [ALAS2023-2026-3193](https://patchblox.com/security/data/fix/linux/alas2023-2026-3193.md) | Nov 7, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.56-125.164.amzn2023 | [ALAS2023-2026-3251](https://patchblox.com/security/data/fix/linux/alas2023-2026-3251.md) | Nov 7, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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