{"cve":"CVE-2026-64504","nvd":{"published":"2026-07-25T10:17:36.443","modified":"2026-08-17T05:17:56.503","status":"Received","description":"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 > 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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/2fe0531dd73eff1de0f2584cb77716d645e548d5","https://git.kernel.org/stable/c/35a3cd8fd65e15029eb90f1e510045b1bb071175","https://git.kernel.org/stable/c/3e766526827acd542bcd36c20c4d5f397e0f6521","https://git.kernel.org/stable/c/89f4a4ca0ac3a933c750569a771c079a290b0721","https://git.kernel.org/stable/c/b5a9f521e0a49a0266200fd535b32a9668ecb33b"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64504","score":0.00165,"percentile":0.05737,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}