CVE-2026-74673

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On architectures where struct input_event contains explicit\nor implicit padding (such as the 32-bit __pad field on SPARC64), these\npadding bytes are left uninitialized.\n\nWhen this event structure is subsequently passed to the client buffer\nand later copied to userspace, the uninitialized padding bytes leak\nkernel stack memory, potentially exposing sensitive information.\n\nSimilar issues exist in __evdev_queue_syn_dropped and __pass_event.\n\nFix this by explicitly zeroing the entire event structure with memset()\nbefore populating its fields. This ensures all padding bytes are cleared\nbefore the data crosses the security boundary."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/input/evdev.c"], "versions": [{"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "d2e3839419ac4047835762c4d7712bda1101b57e", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "c6d5fa46c1ee25d068fc730fd377f0f54188d290", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "e748811d9b80a3e101110ff4b3c612e5fca54d98", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "06a286b320236508d02ab2ccc9496352748652a8", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "7d17e9454a9af3ec7aebb88b41a9deedd5b19a6b", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "bd3c4108a56de34380edab670065e86283cb3029", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "7e55ca1080f09d9f7112c7f20ac31f682c1f2374", "status": "affected", "versionType": "git"}, {"version": "6addb1d6de1968b84852f54561cc9a999909b5a9", "lessThan": "90f305f2c7a30257c683e13f4bf7c798eea992a0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/input/evdev.c"], "versions": [{"version": "2.6.24", "status": "affected"}, {"version": "0", "lessThan": "2.6.24", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "2.6.24", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d2e3839419ac4047835762c4d7712bda1101b57e"}, {"url": "https://git.kernel.org/stable/c/c6d5fa46c1ee25d068fc730fd377f0f54188d290"}, {"url": "https://git.kernel.org/stable/c/e748811d9b80a3e101110ff4b3c612e5fca54d98"}, {"url": "https://git.kernel.org/stable/c/06a286b320236508d02ab2ccc9496352748652a8"}, {"url": "https://git.kernel.org/stable/c/7d17e9454a9af3ec7aebb88b41a9deedd5b19a6b"}, {"url": "https://git.kernel.org/stable/c/bd3c4108a56de34380edab670065e86283cb3029"}, {"url": "https://git.kernel.org/stable/c/7e55ca1080f09d9f7112c7f20ac31f682c1f2374"}, {"url": "https://git.kernel.org/stable/c/90f305f2c7a30257c683e13f4bf7c798eea992a0"}], "title": "Input: evdev - 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However, it is never fully\ninitialized. On architectures where struct input_event contains explicit\nor implicit padding (such as the 32-bit __pad field on SPARC64), these\npadding bytes are left uninitialized.\n\nWhen this event structure is subsequently passed to the client buffer\nand later copied to userspace, the uninitialized padding bytes leak\nkernel stack memory, potentially exposing sensitive information.\n\nSimilar issues exist in __evdev_queue_syn_dropped and __pass_event.\n\nFix this by explicitly zeroing the entire event structure with memset()\nbefore populating its fields. This ensures all padding bytes are cleared\nbefore the data crosses the security boundary."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.24"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:23:15.607Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74673", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:50.759Z", "dateReserved": "2026-08-15T05:44:03.925Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:42.941Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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However, it is never fully\ninitialized. On architectures where struct input_event contains explicit\nor implicit padding (such as the 32-bit __pad field on SPARC64), these\npadding bytes are left uninitialized.\n\nWhen this event structure is subsequently passed to the client buffer\nand later copied to userspace, the uninitialized padding bytes leak\nkernel stack memory, potentially exposing sensitive information.\n\nSimilar issues exist in __evdev_queue_syn_dropped and __pass_event.\n\nFix this by explicitly zeroing the entire event structure with memset()\nbefore populating its fields. This ensures all padding bytes are cleared\nbefore the data crosses the security boundary."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nInput: evdev - corrige fuga de informaci\u00f3n en evdev_pass_values()\n\nEn evdev_pass_values(), la estructura input_event se asigna en la pila del kernel y se rellena campo por campo. Sin embargo, nunca se inicializa completamente. En arquitecturas donde la estructura input_event contiene relleno expl\u00edcito o impl\u00edcito (como el campo __pad de 32 bits en SPARC64), estos bytes de relleno se dejan sin inicializar.\n\nCuando esta estructura de evento se pasa posteriormente al b\u00fafer del cliente y luego se copia al espacio de usuario, los bytes de relleno sin inicializar fugan memoria de la pila del kernel, exponiendo potencialmente informaci\u00f3n sensible.\n\nProblemas similares existen en __evdev_queue_syn_dropped y __pass_event.\n\nSolucione esto poniendo a cero expl\u00edcitamente toda la estructura de evento con memset() antes de rellenar sus campos. Esto asegura que todos los bytes de relleno se borren antes de que los datos crucen el l\u00edmite de seguridad."}], "id": "CVE-2026-74673", "lastModified": "2026-11-06T17:19:53.807", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74673", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T17:00:56.547125Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:41.347", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06a286b320236508d02ab2ccc9496352748652a8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d17e9454a9af3ec7aebb88b41a9deedd5b19a6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e55ca1080f09d9f7112c7f20ac31f682c1f2374"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/90f305f2c7a30257c683e13f4bf7c798eea992a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bd3c4108a56de34380edab670065e86283cb3029"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6d5fa46c1ee25d068fc730fd377f0f54188d290"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d2e3839419ac4047835762c4d7712bda1101b57e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e748811d9b80a3e101110ff4b3c612e5fca54d98"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Input: evdev - fix information leak in evdev_pass_values()", "id": "2521381", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521381"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-201", "details": ["A flaw was found in the Linux kernel's evdev component. This vulnerability occurs because certain data structures, specifically `input_event`, are not fully cleared before being sent to user applications. This can result in uninitialized memory from the kernel's internal stack being exposed to an attacker. Such an information leak could potentially reveal sensitive data, compromising system security."], "name": "CVE-2026-74673", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74673\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74673\nhttps://lore.kernel.org/linux-cve-announce/2026082230-CVE-2026-74673-da72@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d2e3839419ac4047835762c4d7712bda1101b57e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c6d5fa46c1ee25d068fc730fd377f0f54188d290)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e748811d9b80a3e101110ff4b3c612e5fca54d98)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,06a286b320236508d02ab2ccc9496352748652a8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7d17e9454a9af3ec7aebb88b41a9deedd5b19a6b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,bd3c4108a56de34380edab670065e86283cb3029)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7e55ca1080f09d9f7112c7f20ac31f682c1f2374)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,90f305f2c7a30257c683e13f4bf7c798eea992a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.10.265)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.15.216)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.1.183)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.6.152)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.104)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.45)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.1.9)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-22T19:00:14.811704+00:00", "updated": "2026-08-24T20:15:04.187649+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}