{ "cveId": "CVE-2026-80946", "url": "https://patchblox.com/security/cve/CVE-2026-80946", "summary": "CVE-2026-80946 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-80946, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: fuse: copy request headers via a stack buffer fo...", "description": "In the Linux kernel, the following vulnerability has been resolved: fuse: copy request headers via a stack buffer for io-uring The fuse-io-uring transport copies req-\u003Ein.h out to the ring in fuse_uring_copy_to_ring() and req-\u003Eout.h back in fuse_uring_commit(). Both headers live inside the fuse_request slab object, whose cache (fuse_req_cachep) is created without a usercopy whitelist, so copying them directly to/from userspace trips CONFIG_HARDENED_USERCOPY and panics: usercopy: Kernel memory exposure attempt detected from SLUB object \u0027fuse_request\u0027 (offset 56, size 40)! kernel BUG at mm/usercopy.c:102! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:usercopy_abort (mm/usercopy.c:90) Call Trace: __check_heap_object (mm/slub.c:8268) __check_object_size (mm/usercopy.c:197 mm/usercopy.c:258 mm/usercopy.c:223) copy_header_to_ring (fs/fuse/dev_uring.c:618) fuse_uring_prepare_send (fs/fuse/dev_uring.c:776 fs/fuse/dev_uring.c:785) fuse_uring_send_in_task (fs/fuse/dev_uring.c:1306) tctx_task_work_run (io_uring/tw.c:96) task_work_run (kernel/task_work.c:233) io_run_task_work (io_uring/tw.h:84) io_cqring_wait (io_uring/wait.c:278) __do_sys_io_uring_enter (io_uring/io_uring.c:2685) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Bounce both headers through an on-stack copy so the usercopy touches stack memory, not the slab object.", "published": "2026-09-11T20:19:00Z", "severity": "important", "epss": 0.00166, "epssPercentile": 0.05888, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.51-120.162", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-headers", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-tools", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.18-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.6-1", "fix": "DEBIAN-CVE-2026-80946", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80946", "released": "2026-09-23T19:19:02Z" }, { "platform": "linux", "product": "microvm-kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.51-120.162.amzn2023", "fix": "ALAS2023-2026-3187", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187", "released": "2026-11-07T01:06:52Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T00:53:09Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }