{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2022-48987", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.634Z", "datePublished": "2024-10-21T20:06:03.328Z", "dateUpdated": "2024-11-04T12:20:31.305Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T12:20:31.305Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-dv-timings.c: fix too strict blanking sanity checks\n\nSanity checks were added to verify the v4l2_bt_timings blanking fields\nin order to avoid integer overflows when userspace passes weird values.\n\nBut that assumed that userspace would correctly fill in the front porch,\nbackporch and sync values, but sometimes all you know is the total\nblanking, which is then assigned to just one of these fields.\n\nAnd that can fail with these checks.\n\nSo instead set a maximum for the total horizontal and vertical\nblanking and check that each field remains below that.\n\nThat is still sufficient to avoid integer overflows, but it also\nallows for more flexibility in how userspace fills in these fields."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/v4l2-core/v4l2-dv-timings.c"], "versions": [{"version": "15ded23db134", "lessThan": "0d73b49c4037", "status": "affected", "versionType": "git"}, {"version": "3d43b2b8a3cd", "lessThan": "a2b56627c0d1", "status": "affected", "versionType": "git"}, {"version": "9cf9211635b6", "lessThan": "2572ab14b73a", "status": "affected", "versionType": "git"}, {"version": "b4a3a01762ae", "lessThan": "4afc77068e36", "status": "affected", "versionType": "git"}, {"version": "683015ae1634", "lessThan": "32f01f0306a9", "status": "affected", "versionType": "git"}, {"version": "491c0959f01d", "lessThan": "6fb8bc29bfa8", "status": "affected", "versionType": "git"}, {"version": "dc7276c3f6ca", "lessThan": "d3d14cdf1c7a", "status": "affected", "versionType": "git"}, {"version": "4b6d66a45ed3", "lessThan": "5eef2141776d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/v4l2-core/v4l2-dv-timings.c"], "versions": [{"version": "4.9.332", "lessThan": "4.9.336", "status": "affected", "versionType": "semver"}, {"version": "4.14.298", "lessThan": "4.14.302", "status": "affected", "versionType": "semver"}, {"version": "4.19.264", "lessThan": "4.19.269", "status": "affected", "versionType": "semver"}, {"version": "5.4.223", "lessThan": "5.4.227", "status": "affected", "versionType": "semver"}, {"version": "5.10.153", "lessThan": "5.10.159", "status": "affected", "versionType": "semver"}, {"version": "5.15.77", "lessThan": "5.15.83", "status": "affected", "versionType": "semver"}, {"version": "6.0.7", "lessThan": "6.0.13", "status": "affected", "versionType": "semver"}]}], "references": [{"url": "https://git.kernel.org/stable/c/0d73b49c4037199472b29574ae21c21aef493971"}, {"url": "https://git.kernel.org/stable/c/a2b56627c0d13009e02f6f2c0206c0451ed19a0e"}, {"url": "https://git.kernel.org/stable/c/2572ab14b73aa45b6ae7e4c089ccf119fed5cf89"}, {"url": "https://git.kernel.org/stable/c/4afc77068e36cee45b39d4fdc7513de26980f72c"}, {"url": "https://git.kernel.org/stable/c/32f01f0306a98629508f84d7ef0d1d037bc274a2"}, {"url": "https://git.kernel.org/stable/c/6fb8bc29bfa80707994a63cc97e2f9920e0b0608"}, {"url": "https://git.kernel.org/stable/c/d3d14cdf1c7ae2caa3e999bae95ba99e955fb7c3"}, {"url": "https://git.kernel.org/stable/c/5eef2141776da02772c44ec406d6871a790761ee"}], "title": "media: v4l2-dv-timings.c: fix too strict blanking sanity checks", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48987", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:17:04.941322Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:42.763Z"}}]}}

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Pero eso supon\u00eda que el espacio de usuario rellenar\u00eda correctamente los valores de front porch, back porch y sync, pero a veces todo lo que sabes es el borrado total, que luego se asigna a solo uno de estos campos. Y eso puede fallar con estas comprobaciones. As\u00ed que, en su lugar, establece un m\u00e1ximo para el borrado horizontal y vertical total y comprueba que cada campo permanezca por debajo de eso. 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{"bugzilla": {"description": "kernel: media: v4l2-dv-timings.c: fix too strict blanking sanity checks", "id": "2320709", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320709"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmedia: v4l2-dv-timings.c: fix too strict blanking sanity checks\nSanity checks were added to verify the v4l2_bt_timings blanking fields\nin order to avoid integer overflows when userspace passes weird values.\nBut that assumed that userspace would correctly fill in the front porch,\nbackporch and sync values, but sometimes all you know is the total\nblanking, which is then assigned to just one of these fields.\nAnd that can fail with these checks.\nSo instead set a maximum for the total horizontal and vertical\nblanking and check that each field remains below that.\nThat is still sufficient to avoid integer overflows, but it also\nallows for more flexibility in how userspace fills in these fields."], "name": "CVE-2022-48987", "package_state": [{"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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48987\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48987\nhttps://lore.kernel.org/linux-cve-announce/2024102147-CVE-2022-48987-c88b@gregkh/T"], "threat_severity": "Moderate"}