{"api_version":"1","generated_at":"2026-05-06T09:28:50+00:00","cve":"CVE-2026-31770","urls":{"html":"https://cve.report/CVE-2026-31770","api":"https://cve.report/api/cve/CVE-2026-31770.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31770","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31770"},"summary":{"title":"hwmon: (occ) Fix division by zero in occ_show_power_1()","description":"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]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:40","updated_at":"2026-05-01 15:24:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38","name":"https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d","name":"https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475","name":"https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d","name":"https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3","name":"https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733","name":"https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5","name":"https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8","name":"https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31770","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31770","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca c7d3712362c8ab8f82f441b649d9e446e7b9aa9d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 53e6175756b8c474b6247bbcea0aad3d68357475 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 2502684b9e835de9a992ec47c3e6c6faabe3858d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 37ae8fadc74ed68e5bc364ffd17746d88e449ae3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31770","cve":"CVE-2026-31770","epss":"0.000240000","percentile":"0.068060000","score_date":"2026-05-05","updated_at":"2026-05-06 00:08:09"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/occ/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c7d3712362c8ab8f82f441b649d9e446e7b9aa9d","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"53e6175756b8c474b6247bbcea0aad3d68357475","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"2502684b9e835de9a992ec47c3e6c6faabe3858d","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"37ae8fadc74ed68e5bc364ffd17746d88e449ae3","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"bbbefc48f6617cfb738dcff7f44beb50b5dfeb38","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"243d55bd3f08cb15eee9d63f4716d4d4cdd760f5","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"7b89ce0c98bf3015f493ca4285b2d1056cd8c733","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"},{"lessThan":"39e2a5bf970402a8530a319cf06122e216ba57b8","status":"affected","version":"c10e753d43ebd1d17e1c62bcee20c6124c2c7cca","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/occ/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.0"},{"lessThan":"5.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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]"}],"providerMetadata":{"dateUpdated":"2026-05-01T14:14:59.256Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31770","datePublished":"2026-05-01T14:14:59.256Z","dateReserved":"2026-03-09T15:48:24.140Z","dateUpdated":"2026-05-01T14:14:59.256Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:40","lastModifiedDate":"2026-05-01 15:24:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31770","Ordinal":"1","Title":"hwmon: (occ) Fix division by zero in occ_show_power_1()","CVE":"CVE-2026-31770","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31770","Ordinal":"1","NoteData":"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]","Type":"Description","Title":"hwmon: (occ) Fix division by zero in occ_show_power_1()"}]}}}