CVE-2026-64504 is a vulnerability in Linux Kernel
Published on July 25, 2026
iio: accel: bmc150: clamp the device-reported FIFO frame count
In the Linux kernel, the following vulnerability has been resolved:
iio: accel: bmc150: clamp the device-reported FIFO frame count
__bmc150_accel_fifo_flush() copies the number of samples the device
reports in its hardware FIFO into an on-stack buffer
u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];
which is sized for at most BMC150_ACCEL_FIFO_LENGTH (32) samples. The
frame count is read from the FIFO_STATUS register and only masked to its
7 valid bits:
count = val & 0x7F;
so it can be 0..127. The only other limit applied to it is the optional
caller-supplied sample budget:
if (samples && count > samples)
count = samples;
which does not constrain count on the flush-all path (samples == 0), and
leaves it well above 32 whenever samples is larger. count samples are
then transferred into buffer[]:
bmc150_accel_fifo_transfer(data, (u8 *)buffer, count);
bmc150_accel_fifo_transfer() reads count * 6 bytes through regmap, so a
malfunctioning, malicious or counterfeit accelerometer (or an attacker
tampering with the I2C/SPI bus) that reports up to 127 frames writes up
to 762 bytes into the 192-byte buffer: a stack out-of-bounds write of up
to 570 bytes that clobbers the stack canary, saved registers and the
return address.
Clamp count to BMC150_ACCEL_FIFO_LENGTH, the number of samples buffer[]
is sized for, before the transfer, mirroring the watermark clamp already
done in bmc150_accel_set_watermark(). A well-formed flush reports at most
BMC150_ACCEL_FIFO_LENGTH frames, so legitimate devices are unaffected.
Products Associated with CVE-2026-64504
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Affected Versions
Linux:- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below b5a9f521e0a49a0266200fd535b32a9668ecb33b is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below 2fe0531dd73eff1de0f2584cb77716d645e548d5 is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below 89f4a4ca0ac3a933c750569a771c079a290b0721 is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below 3e766526827acd542bcd36c20c4d5f397e0f6521 is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below 35a3cd8fd65e15029eb90f1e510045b1bb071175 is affected.
- Version 3bbec9773389112330954a6a64422eaa78d546c1 and below ce0e1cae26096fe959a0da5563a6d6d5a801d5fb is affected.
- Version 4.1 is affected.
- Before 4.1 is unaffected.
- Version 5.10.261, <= 5.10.* is unaffected.
- Version 5.15.212, <= 5.15.* is unaffected.
- Version 6.1.178, <= 6.1.* is unaffected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.96, <= 6.12.* is unaffected.
- Version 6.18.39, <= 6.18.* is unaffected.
- Version 7.1.4, <= 7.1.* is unaffected.
- Version 7.2-rc3, <= * is unaffected.