{"id":"CVE-2026-64504","summary":"iio: accel: bmc150: clamp the device-reported FIFO frame count","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: accel: bmc150: clamp the device-reported FIFO frame count\n\n__bmc150_accel_fifo_flush() copies the number of samples the device\nreports in its hardware FIFO into an on-stack buffer\n\n\tu16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];\n\nwhich is sized for at most BMC150_ACCEL_FIFO_LENGTH (32) samples. The\nframe count is read from the FIFO_STATUS register and only masked to its\n7 valid bits:\n\n\tcount = val & 0x7F;\n\nso it can be 0..127. The only other limit applied to it is the optional\ncaller-supplied sample budget:\n\n\tif (samples && count \u003e samples)\n\t\tcount = samples;\n\nwhich does not constrain count on the flush-all path (samples == 0), and\nleaves it well above 32 whenever samples is larger. count samples are\nthen transferred into buffer[]:\n\n\tbmc150_accel_fifo_transfer(data, (u8 *)buffer, count);\n\nbmc150_accel_fifo_transfer() reads count * 6 bytes through regmap, so a\nmalfunctioning, malicious or counterfeit accelerometer (or an attacker\ntampering with the I2C/SPI bus) that reports up to 127 frames writes up\nto 762 bytes into the 192-byte buffer: a stack out-of-bounds write of up\nto 570 bytes that clobbers the stack canary, saved registers and the\nreturn address.\n\nClamp count to BMC150_ACCEL_FIFO_LENGTH, the number of samples buffer[]\nis sized for, before the transfer, mirroring the watermark clamp already\ndone in bmc150_accel_set_watermark(). A well-formed flush reports at most\nBMC150_ACCEL_FIFO_LENGTH frames, so legitimate devices are unaffected.","modified":"2026-08-18T03:31:15.456238335Z","published":"2026-07-25T08:51:58.887Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64504.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2fe0531dd73eff1de0f2584cb77716d645e548d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/35a3cd8fd65e15029eb90f1e510045b1bb071175"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e766526827acd542bcd36c20c4d5f397e0f6521"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89f4a4ca0ac3a933c750569a771c079a290b0721"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b5a9f521e0a49a0266200fd535b32a9668ecb33b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce0e1cae26096fe959a0da5563a6d6d5a801d5fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64504.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64504"},{"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":"3bbec9773389112330954a6a64422eaa78d546c1"},{"fixed":"b5a9f521e0a49a0266200fd535b32a9668ecb33b"},{"fixed":"2fe0531dd73eff1de0f2584cb77716d645e548d5"},{"fixed":"d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff"},{"fixed":"bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc"},{"fixed":"89f4a4ca0ac3a933c750569a771c079a290b0721"},{"fixed":"3e766526827acd542bcd36c20c4d5f397e0f6521"},{"fixed":"35a3cd8fd65e15029eb90f1e510045b1bb071175"},{"fixed":"ce0e1cae26096fe959a0da5563a6d6d5a801d5fb"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64504.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.1.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64504.json"}}],"schema_version":"1.9.0"}