{"id":"CVE-2026-64504","title":"iio: accel: bmc150: clamp the device-reported FIFO frame count","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < b5a9f521e0a49a0266200fd535b32a9668ecb33b","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 2fe0531dd73eff1de0f2584cb77716d645e548d5","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 89f4a4ca0ac3a933c750569a771c079a290b0721","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 3e766526827acd542bcd36c20c4d5f397e0f6521","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 35a3cd8fd65e15029eb90f1e510045b1bb071175","Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < ce0e1cae26096fe959a0da5563a6d6d5a801d5fb","Linux 4.1"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:40:33.324913Z"},"published":"2026-07-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:55.652Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64504","references":[{"url":"https://git.kernel.org/stable/c/b5a9f521e0a49a0266200fd535b32a9668ecb33b"},{"url":"https://git.kernel.org/stable/c/2fe0531dd73eff1de0f2584cb77716d645e548d5"},{"url":"https://git.kernel.org/stable/c/d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff"},{"url":"https://git.kernel.org/stable/c/bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc"},{"url":"https://git.kernel.org/stable/c/89f4a4ca0ac3a933c750569a771c079a290b0721"},{"url":"https://git.kernel.org/stable/c/3e766526827acd542bcd36c20c4d5f397e0f6521"},{"url":"https://git.kernel.org/stable/c/35a3cd8fd65e15029eb90f1e510045b1bb071175"},{"url":"https://git.kernel.org/stable/c/ce0e1cae26096fe959a0da5563a6d6d5a801d5fb"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.05777,"ingestedAt":"2026-11-06T16:57:43.159Z","slug":"CVE-2026-64504","body":"## Overview\n\nIn 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 > 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.\n\n## Affected\n\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < b5a9f521e0a49a0266200fd535b32a9668ecb33b`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 2fe0531dd73eff1de0f2584cb77716d645e548d5`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 89f4a4ca0ac3a933c750569a771c079a290b0721`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 3e766526827acd542bcd36c20c4d5f397e0f6521`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < 35a3cd8fd65e15029eb90f1e510045b1bb071175`\n- `Linux >= 3bbec9773389112330954a6a64422eaa78d546c1 < ce0e1cae26096fe959a0da5563a6d6d5a801d5fb`\n- `Linux 4.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}