CVE-2026-43442

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43442", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.009Z", "datePublished": "2026-05-08T14:22:10.656Z", "dateUpdated": "2026-08-05T12:27:59.003Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:59.003Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops\n\nWhen IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY,\nthe boundary check for 128-byte SQE operations in io_init_req()\nvalidated the logical SQ head position rather than the physical SQE\nindex.\n\nThe existing check:\n\n !(ctx->cached_sq_head & (ctx->sq_entries - 1))\n\nensures the logical position isn't at the end of the ring, which is\ncorrect for NO_SQARRAY rings where physical == logical. However, when\nsq_array is present, an unprivileged user can remap any logical\nposition to an arbitrary physical index via sq_array. Setting\nsq_array[N] = sq_entries - 1 places a 128-byte operation at the last\nphysical SQE slot, causing the 128-byte memcpy in\nio_uring_cmd_sqe_copy() to read 64 bytes past the end of the SQE\narray.\n\nReplace the cached_sq_head alignment check with a direct validation\nof the physical SQE index, which correctly handles both sq_array and\nNO_SQARRAY cases."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through local io_uring syscalls and userspace-controlled SQ/SQE mappings, not by remote packets or physical access.\nAC:L - The attacker controls ring setup flags, sq_array contents, SQEs, and submission order; no race or external timing condition is required.\nPR:L - A basic unprivileged local user can create io_uring instances on the default kernel.io_uring_disabled=0 configuration and can use accessible uring_cmd files such as /dev/null or sockets.\nUI:N - Exploitation only requires the attacker's own syscall sequence and mapped ring manipulation, with no victim action.\nS:U - The issue remains within the kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bad 128-byte memcpy can read 64 bytes past the SQE array; for page-boundary layouts this can read adjacent kernel memory, so confidentiality impact is high.\nI:N - The investigated primitive is an out-of-bounds read into a valid request buffer, with no out-of-bounds write or direct arbitrary modification primitive identified.\nA:H - The same out-of-bounds read can fault or trigger kernel diagnostics/oops conditions and is repeatable by the local attacker."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/io_uring.c"], "versions": [{"version": "1cba30bf9fdd6c982708f3587f609a30c370d889", "lessThan": "1f794f9bed3e5cf7250a3b4daf112a72ed1513e9", "status": "affected", "versionType": "git"}, {"version": "1cba30bf9fdd6c982708f3587f609a30c370d889", "lessThan": "6f02c6b196036dbb6defb4647d8707d29b7fe95b", "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/io_uring.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.19", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1f794f9bed3e5cf7250a3b4daf112a72ed1513e9"}, {"url": "https://git.kernel.org/stable/c/6f02c6b196036dbb6defb4647d8707d29b7fe95b"}], "title": "io_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["io_uring/io_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1f794f9bed3e5cf7250a3b4daf112a72ed1513e9", "status": "affected", "version": "1cba30bf9fdd6c982708f3587f609a30c370d889", "versionType": "git"}, {"lessThan": "6f02c6b196036dbb6defb4647d8707d29b7fe95b", "status": "affected", "version": "1cba30bf9fdd6c982708f3587f609a30c370d889", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["io_uring/io_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops\n\nWhen IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY,\nthe boundary check for 128-byte SQE operations in io_init_req()\nvalidated the logical SQ head position rather than the physical SQE\nindex.\n\nThe existing check:\n\n !(ctx->cached_sq_head & (ctx->sq_entries - 1))\n\nensures the logical position isn't at the end of the ring, which is\ncorrect for NO_SQARRAY rings where physical == logical. However, when\nsq_array is present, an unprivileged user can remap any logical\nposition to an arbitrary physical index via sq_array. Setting\nsq_array[N] = sq_entries - 1 places a 128-byte operation at the last\nphysical SQE slot, causing the 128-byte memcpy in\nio_uring_cmd_sqe_copy() to read 64 bytes past the end of the SQE\narray.\n\nReplace the cached_sq_head alignment check with a direct validation\nof the physical SQE index, which correctly handles both sq_array and\nNO_SQARRAY cases."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring: correcci\u00f3n de la verificaci\u00f3n de l\u00edmites de SQE f\u00edsico para operaciones SQE_MIXED de 128 bytes\n\nCuando IORING_SETUP_SQE_MIXED se usa sin IORING_SETUP_NO_SQARRAY, la verificaci\u00f3n de l\u00edmites para operaciones SQE de 128 bytes en io_init_req() validaba la posici\u00f3n l\u00f3gica de la cabecera SQ en lugar del \u00edndice SQE f\u00edsico.\n\nLa verificaci\u00f3n existente:\n\n!(ctx -> cached_sq_head & (ctx -> sq_entries - 1))\n\nasegura que la posici\u00f3n l\u00f3gica no est\u00e9 al final del anillo, lo cual es correcto para anillos NO_SQARRAY donde f\u00edsico == l\u00f3gico. Sin embargo, cuando sq_array est\u00e1 presente, un usuario sin privilegios puede reasignar cualquier posici\u00f3n l\u00f3gica a un \u00edndice f\u00edsico arbitrario a trav\u00e9s de sq_array. Establecer sq_array[N] = sq_entries - 1 coloca una operaci\u00f3n de 128 bytes en la \u00faltima ranura SQE f\u00edsica, causando que el memcpy de 128 bytes en io_uring_cmd_sqe_copy() lea 64 bytes m\u00e1s all\u00e1 del final del array SQE.\n\nReemplazar la verificaci\u00f3n de alineaci\u00f3n de cached_sq_head con una validaci\u00f3n directa del \u00edndice SQE f\u00edsico, que maneja correctamente tanto los casos de sq_array como de NO_SQARRAY."}], "id": "CVE-2026-43442", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-08T15:16:56.663", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f794f9bed3e5cf7250a3b4daf112a72ed1513e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f02c6b196036dbb6defb4647d8707d29b7fe95b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: io_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops", "id": "2468226", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468226"}, "csaw": false, "cwe": "CWE-805", "details": ["A flaw was found in the Linux kernel's io_uring subsystem. An incorrect bounds check for 128-byte Submission Queue Entry (SQE) operations, when IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY, allows an unprivileged local user to remap logical SQE positions to arbitrary physical indices. This can lead to an out-of-bounds read, potentially disclosing sensitive information from kernel memory."], "name": "CVE-2026-43442", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43442\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43442\nhttps://lore.kernel.org/linux-cve-announce/2026050854-CVE-2026-43442-88f3@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1cba30bf9fdd6c982708f3587f609a30c370d889,1f794f9bed3e5cf7250a3b4daf112a72ed1513e9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1cba30bf9fdd6c982708f3587f609a30c370d889,6f02c6b196036dbb6defb4647d8707d29b7fe95b)"}}], "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": "[6.19,6.19]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-05-08T18:15:13.668478+00:00", "updated": "2026-05-21T19:45:17.790137+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}