CVE-2026-80946

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80946", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.803Z", "datePublished": "2026-09-11T19:42:17.576Z", "dateUpdated": "2026-10-19T08:45:30.291Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:30.291Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: copy request headers via a stack buffer for io-uring\n\nThe fuse-io-uring transport copies req->in.h out to the ring in\nfuse_uring_copy_to_ring() and req->out.h back in fuse_uring_commit().\nBoth headers live inside the fuse_request slab object, whose cache\n(fuse_req_cachep) is created without a usercopy whitelist, so copying\nthem directly to/from userspace trips CONFIG_HARDENED_USERCOPY and\npanics:\n\n usercopy: Kernel memory exposure attempt detected from SLUB object\n 'fuse_request' (offset 56, size 40)!\n kernel BUG at mm/usercopy.c:102!\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:usercopy_abort (mm/usercopy.c:90)\n Call Trace:\n __check_heap_object (mm/slub.c:8268)\n __check_object_size (mm/usercopy.c:197 mm/usercopy.c:258 mm/usercopy.c:223)\n copy_header_to_ring (fs/fuse/dev_uring.c:618)\n fuse_uring_prepare_send (fs/fuse/dev_uring.c:776 fs/fuse/dev_uring.c:785)\n fuse_uring_send_in_task (fs/fuse/dev_uring.c:1306)\n tctx_task_work_run (io_uring/tw.c:96)\n task_work_run (kernel/task_work.c:233)\n io_run_task_work (io_uring/tw.h:84)\n io_cqring_wait (io_uring/wait.c:278)\n __do_sys_io_uring_enter (io_uring/io_uring.c:2685)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nBounce both headers through an on-stack copy so the usercopy touches\nstack memory, not the slab object."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fuse/dev_uring.c"], "versions": [{"version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "lessThan": "194d0fb0ea4720535ff3168c9d04c7632cec7071", "status": "affected", "versionType": "git"}, {"version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "lessThan": "a47a416ff68d706dc3327ab583f86b9ee757358b", "status": "affected", "versionType": "git"}, {"version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "lessThan": "fd10f40af314f07b6d6e028b1ca25c8b49903aab", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fuse/dev_uring.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071"}, {"url": "https://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b"}, {"url": "https://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab"}], "title": "fuse: copy request headers via a stack buffer for io-uring", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/fuse/dev_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "194d0fb0ea4720535ff3168c9d04c7632cec7071", "status": "affected", "version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "versionType": "git"}, {"lessThan": "a47a416ff68d706dc3327ab583f86b9ee757358b", "status": "affected", "version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "versionType": "git"}, {"lessThan": "fd10f40af314f07b6d6e028b1ca25c8b49903aab", "status": "affected", "version": "c090c8abae4b6b77a1bee116aa6c385456ebef96", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/fuse/dev_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: copy request headers via a stack buffer for io-uring\n\nThe fuse-io-uring transport copies req->in.h out to the ring in\nfuse_uring_copy_to_ring() and req->out.h back in fuse_uring_commit().\nBoth headers live inside the fuse_request slab object, whose cache\n(fuse_req_cachep) is created without a usercopy whitelist, so copying\nthem directly to/from userspace trips CONFIG_HARDENED_USERCOPY and\npanics:\n\n usercopy: Kernel memory exposure attempt detected from SLUB object\n 'fuse_request' (offset 56, size 40)!\n kernel BUG at mm/usercopy.c:102!\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:usercopy_abort (mm/usercopy.c:90)\n Call Trace:\n __check_heap_object (mm/slub.c:8268)\n __check_object_size (mm/usercopy.c:197 mm/usercopy.c:258 mm/usercopy.c:223)\n copy_header_to_ring (fs/fuse/dev_uring.c:618)\n fuse_uring_prepare_send (fs/fuse/dev_uring.c:776 fs/fuse/dev_uring.c:785)\n fuse_uring_send_in_task (fs/fuse/dev_uring.c:1306)\n tctx_task_work_run (io_uring/tw.c:96)\n task_work_run (kernel/task_work.c:233)\n io_run_task_work (io_uring/tw.h:84)\n io_cqring_wait (io_uring/wait.c:278)\n __do_sys_io_uring_enter (io_uring/io_uring.c:2685)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nBounce both headers through an on-stack copy so the usercopy touches\nstack memory, not the slab object."}], "id": "CVE-2026-80946", "lastModified": "2026-10-19T09:17:25.933", "metrics": {}, "published": "2026-09-11T20:19:00.180", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel FUSE: Denial of Service and potential memory exposure in `io-uring`", "id": "2532123", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532123"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-501", "details": ["A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The `io-uring` transport attempts to copy request headers directly to or from user space without proper memory validation. A local attacker could exploit this vulnerability, leading to a kernel panic and a denial of service. This issue could also potentially result in the exposure of sensitive kernel memory."], "name": "CVE-2026-80946", "public_date": "2026-09-11T19:42:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80946\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80946\nhttps://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071\nhttps://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b\nhttps://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c090c8abae4b6b77a1bee116aa6c385456ebef96,194d0fb0ea4720535ff3168c9d04c7632cec7071)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c090c8abae4b6b77a1bee116aa6c385456ebef96,a47a416ff68d706dc3327ab583f86b9ee757358b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c090c8abae4b6b77a1bee116aa6c385456ebef96,fd10f40af314f07b6d6e028b1ca25c8b49903aab)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.14,6.14]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T01:45:03.771439+00:00", "updated": "2026-09-21T03:00:12.575447+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}