UnratedFix available
spi: fsl-cpm: Check length parity before switching to 16 bit mode
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: spi: fsl-cpm: Check length parity before switching to 16 bit mode Commit fc96ec826bce ("spi: fsl-cpm: Use 16 bit mode for large transfers with even size") failed to make sure that the size is really even before switching to 16 bit mode. Until recently the problem went unnoticed because kernfs uses a pre-allocated bounce buffer of size PAGE_SIZE for reading EEPROM. But commit 8ad6249c51d0 ("eeprom: at25: convert to spi-mem API") introduced an additional dynamically allocated bounce buffer whose size is exactly the size of the transfer, leading to a buffer overrun in the fsl-cpm driver when that size is odd. Add the missing length parity verification and remain in 8 bit mode when the length is not even.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.248, 5.15.198, 6.1.160, 6.12.64, 6.18.3, 6.6.120
- CVEs
- CVE-2025-68773
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 16:30 UTC · Revision 1
Source evidence
spi: fsl-cpm: Check length parity before switching to 16 bit mode
core-osv · Original sourcePublished 13 Jan 2026, 15:28 UTC
In the Linux kernel, the following vulnerability has been resolved: spi: fsl-cpm: Check length parity before switching to 16 bit mode Commit fc96ec826bce ("spi: fsl-cpm: Use 16 bit mode for large transfers with even size") failed to make sure that the size is really even before switching to 16 bit mode. Until recently the problem went unnoticed because kernfs uses a pre-allocated bounce buffer of size PAGE_SIZE for reading EEPROM. But commit 8ad6249c51d0 ("eeprom: at25: convert to spi-mem API") introduced an additional dynamically allocated bounce buffer whose size is exactly the size of the transfer, leading to a buffer overrun in the fsl-cpm driver when that size is odd. Add the missing length parity verification and remain in 8 bit mode when the length is not even.
osv:CVE-2025-68773
Kernel
Fixed versions: 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3
Complete source record
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"modified": "2026-10-28T02:30:30.819528077Z",
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"https://git.kernel.org/stable/c/be0b613198e6bfa104ad520397cab82ad3ec1771",
"https://git.kernel.org/stable/c/c8f1d35076b78df61ace737e41cc1f4b7b63236c",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68773.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-68773",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68773.json"
}
},
"related_cves": [
{
"value": "CVE-2025-68773",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 497396,
"published_at": "2026-01-13T15:28:50.686+00:00"
}