{"id":"CVE-2026-64504","state":"PUBLISHED","title":"iio: accel: bmc150: clamp the device-reported FIFO frame count","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.","publishedAt":"2026-07-25T08:51:58.887Z","updatedAt":"2026-08-17T04:56:54.396Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"b5a9f521e0a49a0266200fd535b32a9668ecb33b","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"2fe0531dd73eff1de0f2584cb77716d645e548d5","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"89f4a4ca0ac3a933c750569a771c079a290b0721","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"3e766526827acd542bcd36c20c4d5f397e0f6521","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"35a3cd8fd65e15029eb90f1e510045b1bb071175","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"ce0e1cae26096fe959a0da5563a6d6d5a801d5fb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/accel/bmc150-accel-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/accel/bmc150-accel-core.c"]}],"references":["https://git.kernel.org/stable/c/b5a9f521e0a49a0266200fd535b32a9668ecb33b","https://git.kernel.org/stable/c/2fe0531dd73eff1de0f2584cb77716d645e548d5","https://git.kernel.org/stable/c/d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff","https://git.kernel.org/stable/c/bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc","https://git.kernel.org/stable/c/89f4a4ca0ac3a933c750569a771c079a290b0721","https://git.kernel.org/stable/c/3e766526827acd542bcd36c20c4d5f397e0f6521","https://git.kernel.org/stable/c/35a3cd8fd65e15029eb90f1e510045b1bb071175","https://git.kernel.org/stable/c/ce0e1cae26096fe959a0da5563a6d6d5a801d5fb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64504.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64504","state":"PUBLISHED","datePublished":"2026-07-25T08:51:58.887Z","dateUpdated":"2026-08-17T04:56:54.396Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.793Z"},"containers":{"cna":{"title":"iio: accel: bmc150: clamp the device-reported FIFO frame count","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"b5a9f521e0a49a0266200fd535b32a9668ecb33b","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"2fe0531dd73eff1de0f2584cb77716d645e548d5","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"d0e6d924a5484e005cae5aff6a0aa07a22f3c9ff","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"bfffc98f3de92e0f76be7c7b72e63ac1776a6dbc","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"89f4a4ca0ac3a933c750569a771c079a290b0721","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"3e766526827acd542bcd36c20c4d5f397e0f6521","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"35a3cd8fd65e15029eb90f1e510045b1bb071175","versionType":"git"},{"version":"3bbec9773389112330954a6a64422eaa78d546c1","status":"affected","lessThan":"ce0e1cae26096fe959a0da5563a6d6d5a801d5fb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/accel/bmc150-accel-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/accel/bmc150-accel-core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:56:54.396Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}