{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81009", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.812Z", "datePublished": "2026-09-11T19:43:00.074Z", "dateUpdated": "2026-09-11T19:43:00.074Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:43:00.074Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/query: cap user size passed to copy_struct_to_user\n\nio_handle_query_entry() clamps hdr.size for the inbound copy_from_user()\nbut keeps the original user value as usize. copy_struct_to_user() uses\nthat usize and, when it is larger than the kernel result, clear_user()s\nthe trailing bytes.\n\nAs hdr.size is a __u32, a query can request nearly 4 GiB of zeroing,\nincluding on the error path where res_size stays 0. The interface is\nreachable without a ring via IORING_REGISTER_QUERY.\n\nReject sizes larger than PAGE_SIZE, as recommended for copy_struct_*\ninterfaces."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/query.c"], "versions": [{"version": "c265ae75f900cea4e415230a77b5d152377627dd", "lessThan": "417e02f7b6051765b91cf1289071882eebd172e0", "status": "affected", "versionType": "git"}, {"version": "c265ae75f900cea4e415230a77b5d152377627dd", "lessThan": "2b8ad4981ecedb14c1fdd811ab977010b23933e6", "status": "affected", "versionType": "git"}, {"version": "c265ae75f900cea4e415230a77b5d152377627dd", "lessThan": "ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/query.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.18", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/417e02f7b6051765b91cf1289071882eebd172e0"}, {"url": "https://git.kernel.org/stable/c/2b8ad4981ecedb14c1fdd811ab977010b23933e6"}, {"url": "https://git.kernel.org/stable/c/ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b"}], "title": "io_uring/query: cap user size passed to copy_struct_to_user", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["io_uring/query.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "417e02f7b6051765b91cf1289071882eebd172e0", "status": "affected", "version": "c265ae75f900cea4e415230a77b5d152377627dd", "versionType": "git"}, {"lessThan": "2b8ad4981ecedb14c1fdd811ab977010b23933e6", "status": "affected", "version": "c265ae75f900cea4e415230a77b5d152377627dd", "versionType": "git"}, {"lessThan": "ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b", "status": "affected", "version": "c265ae75f900cea4e415230a77b5d152377627dd", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["io_uring/query.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nio_uring/query: cap user size passed to copy_struct_to_user\n\nio_handle_query_entry() clamps hdr.size for the inbound copy_from_user()\nbut keeps the original user value as usize. copy_struct_to_user() uses\nthat usize and, when it is larger than the kernel result, clear_user()s\nthe trailing bytes.\n\nAs hdr.size is a __u32, a query can request nearly 4 GiB of zeroing,\nincluding on the error path where res_size stays 0. The interface is\nreachable without a ring via IORING_REGISTER_QUERY.\n\nReject sizes larger than PAGE_SIZE, as recommended for copy_struct_*\ninterfaces."}], "id": "CVE-2026-81009", "lastModified": "2026-09-11T20:19:09.687", "metrics": {}, "published": "2026-09-11T20:19:09.687", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b8ad4981ecedb14c1fdd811ab977010b23933e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/417e02f7b6051765b91cf1289071882eebd172e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Denial of Service in io_uring/query due to excessive memory zeroing", "id": "2532289", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532289"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in the Linux kernel. The `io_uring/query` interface, specifically within the `io_handle_query_entry()` function, does not properly cap the user-provided size when zeroing memory. A local attacker can exploit this by sending a specially crafted query that requests an excessively large amount of memory, up to 4 Gigabytes (GiB), to be zeroed. This can lead to a Denial of Service (DoS) due to the system performing extensive memory operations."], "name": "CVE-2026-81009", "public_date": "2026-09-11T19:43:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-81009\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-81009\nhttps://git.kernel.org/stable/c/2b8ad4981ecedb14c1fdd811ab977010b23933e6\nhttps://git.kernel.org/stable/c/417e02f7b6051765b91cf1289071882eebd172e0\nhttps://git.kernel.org/stable/c/ba77efee1b95b4ad7559b1cdbe7cd7fa36dca95b"], "threat_severity": "Moderate"}

{"created": "2026-09-12T03:15:06.702171+00:00", "updated": "2026-09-12T03:15:06.702177+00:00", "vendors": []}