{"id":"CVE-2026-43380","summary":"hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read","details":"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.","modified":"2026-07-22T18:22:31.570723691Z","published":"2026-05-08T14:21:28.702Z","related":["SUSE-SU-2026:3130-1","SUSE-SU-2026:3166-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43380.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43380.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43380"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d014538aa38561cd24c5eb228223585f26c5ec71"},{"fixed":"a0fc1b9c738fba231f190ab960c83202722efee5"},{"fixed":"c59090c50f62a17129fc4c5407bc4071305a9e82"},{"fixed":"52db5ef163c96f916d424e472fb17aadc35a9f7a"},{"fixed":"b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"},{"fixed":"73a7a345816946d276ad2c46c8bb771de67cfc46"},{"fixed":"24a7b9daa103fa963b3fd37d8805b23e01621976"},{"fixed":"25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43380.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43380.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}