CVE-2026-31770

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If no samples have been\ncollected yet (e.g. during early boot when the sensor block is\nincluded but hasn't been updated), update_tag is zero, causing\na kernel divide-by-zero crash.\n\nThe 2019 fix in commit 211186cae14d (\"hwmon: (occ) Fix division by\nzero issue\") only addressed occ_get_powr_avg() used by\nocc_show_power_2() and occ_show_power_a0(). This separate code\npath in occ_show_power_1() was missed.\n\nFix this by reusing the existing occ_get_powr_avg() helper, which\nalready handles the zero-sample case and uses mul_u64_u32_div()\nto multiply before dividing for better precision. Move the helper\nabove occ_show_power_1() so it is visible at the call site.\n\n[groeck: Fix alignment problems reported by checkpatch]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/occ/common.c"], "versions": [{"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "c7d3712362c8ab8f82f441b649d9e446e7b9aa9d", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "53e6175756b8c474b6247bbcea0aad3d68357475", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "2502684b9e835de9a992ec47c3e6c6faabe3858d", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "37ae8fadc74ed68e5bc364ffd17746d88e449ae3", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "bbbefc48f6617cfb738dcff7f44beb50b5dfeb38", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "243d55bd3f08cb15eee9d63f4716d4d4cdd760f5", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "7b89ce0c98bf3015f493ca4285b2d1056cd8c733", "status": "affected", "versionType": "git"}, {"version": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca", "lessThan": "39e2a5bf970402a8530a319cf06122e216ba57b8", "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/hwmon/occ/common.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "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": "5.0", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d"}, {"url": "https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475"}, {"url": "https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d"}, {"url": "https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3"}, {"url": "https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38"}, {"url": "https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5"}, {"url": "https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733"}, {"url": "https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8"}], "title": "hwmon: (occ) Fix division by zero in occ_show_power_1()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"5.15.*", "status": "unaffected", "version": "5.15.203", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.168", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.134", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.81", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.22", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "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": "A58C0269-40CC-43D7-8F8A-B2C38025D165", "versionEndExcluding": "5.10.253", "versionStartIncluding": "5.0", "vulnerable": 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"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (occ) Fix division by zero in occ_show_power_1()\n\nIn occ_show_power_1() case 1, the accumulator is divided by\nupdate_tag without checking for zero. If no samples have been\ncollected yet (e.g. during early boot when the sensor block is\nincluded but hasn't been updated), update_tag is zero, causing\na kernel divide-by-zero crash.\n\nThe 2019 fix in commit 211186cae14d (\"hwmon: (occ) Fix division by\nzero issue\") only addressed occ_get_powr_avg() used by\nocc_show_power_2() and occ_show_power_a0(). This separate code\npath in occ_show_power_1() was missed.\n\nFix this by reusing the existing occ_get_powr_avg() helper, which\nalready handles the zero-sample case and uses mul_u64_u32_div()\nto multiply before dividing for better precision. Move the helper\nabove occ_show_power_1() so it is visible at the call site.\n\n[groeck: Fix alignment problems reported by checkpatch]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhwmon: (occ) Correcci\u00f3n de divisi\u00f3n por cero en occ_show_power_1()\n\nEn occ_show_power_1() caso 1, el acumulador es dividido por update_tag sin comprobar si es cero. Si a\u00fan no se han recopilado muestras (p. ej., durante el arranque temprano cuando el bloque del sensor est\u00e1 incluido pero no ha sido actualizado), update_tag es cero, causando un fallo de divisi\u00f3n por cero del kernel.\n\nLa correcci\u00f3n de 2019 en el commit 211186cae14d (\u2019hwmon: (occ) Correcci\u00f3n de problema de divisi\u00f3n por cero\u2019) solo abord\u00f3 occ_get_powr_avg() utilizado por occ_show_power_2() y occ_show_power_a0(). Esta ruta de c\u00f3digo separada en occ_show_power_1() se pas\u00f3 por alto.\n\nSolucione esto reutilizando la funci\u00f3n auxiliar occ_get_powr_avg() existente, que ya maneja el caso de cero muestras y utiliza mul_u64_u32_div() para multiplicar antes de dividir para una mejor precisi\u00f3n. Mueva la funci\u00f3n auxiliar por encima de occ_show_power_1() para que sea visible en el sitio de llamada.\n\n[groeck: Correcci\u00f3n de problemas de alineaci\u00f3n reportados por checkpatch]"}], "id": "CVE-2026-31770", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:40.200", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-369"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: hwmon: (occ) Fix division by zero in occ_show_power_1()", "id": "2464440", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464440"}, "csaw": false, "cwe": "CWE-369", "details": ["A flaw was found in the Linux kernel's hwmon subsystem, specifically within the occ driver. During early boot or when no sensor samples have been collected, the occ_show_power_1() function can attempt to divide by zero. A local attacker could exploit this condition, leading to a kernel crash and a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-31770", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31770\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31770\nhttps://lore.kernel.org/linux-cve-announce/2026050148-CVE-2026-31770-f142@gregkh/T"]}

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