{"api_version":"1","generated_at":"2026-05-15T07:55:13+00:00","cve":"CVE-2026-43380","urls":{"html":"https://cve.report/CVE-2026-43380","api":"https://cve.report/api/cve/CVE-2026-43380.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43380","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43380"},"summary":{"title":"hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:49","updated_at":"2026-05-12 14:10:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43","name":"https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46","name":"https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b","name":"https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a","name":"https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82","name":"https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976","name":"https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5","name":"https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43380","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43380","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 a0fc1b9c738fba231f190ab960c83202722efee5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 c59090c50f62a17129fc4c5407bc4071305a9e82 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 52db5ef163c96f916d424e472fb17aadc35a9f7a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 73a7a345816946d276ad2c46c8bb771de67cfc46 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 24a7b9daa103fa963b3fd37d8805b23e01621976 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d014538aa38561cd24c5eb228223585f26c5ec71 25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.11 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 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 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":"43380","cve":"CVE-2026-43380","epss":"0.000300000","percentile":"0.087840000","score_date":"2026-05-12","updated_at":"2026-05-13 00:11:53"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/pmbus/q54sj108a2.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a0fc1b9c738fba231f190ab960c83202722efee5","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"c59090c50f62a17129fc4c5407bc4071305a9e82","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"52db5ef163c96f916d424e472fb17aadc35a9f7a","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"73a7a345816946d276ad2c46c8bb771de67cfc46","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"24a7b9daa103fa963b3fd37d8805b23e01621976","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"},{"lessThan":"25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43","status":"affected","version":"d014538aa38561cd24c5eb228223585f26c5ec71","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/pmbus/q54sj108a2.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.11"},{"lessThan":"5.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","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":"5.15.203","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call."}],"providerMetadata":{"dateUpdated":"2026-05-11T22:23:28.160Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5"},{"url":"https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82"},{"url":"https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a"},{"url":"https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"},{"url":"https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46"},{"url":"https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976"},{"url":"https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"}],"title":"hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43380","datePublished":"2026-05-08T14:21:28.702Z","dateReserved":"2026-05-01T14:12:56.006Z","dateUpdated":"2026-05-11T22:23:28.160Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:49","lastModifiedDate":"2026-05-12 14:10:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43380","Ordinal":"1","Title":"hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read","CVE":"CVE-2026-43380","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43380","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call.","Type":"Description","Title":"hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read"}]}}}