{"id":"CVE-2026-80931","revision":"d833e3cad3464c53926ecc2c9f476056","records":[{"revision":"d833e3cad3464c53926ecc2c9f476056","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80931","aliases":[],"title":"w1: ds28e17: reject an oversize length on an I2C block read","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nw1: ds28e17: reject an oversize length on an I2C block read\n\nw1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire\nto I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the\ndevice. The downstream slave puts a length byte in buf[0]. The driver\nthen reads that many bytes into buf[1] with w1_f19_i2c_read().\n\nbuf[0] is controlled by the device and can be 0 to 255.\nw1_f19_i2c_read() only rejects a zero count. The caller buffer is\nI2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read\nrun past it, up to about 222 bytes out of bounds.\n\nThe SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That\ncheck runs after master_xfer returns. By then the write is already\ndone. i2c-algo-bit rejects an oversize length before it copies, and\nreturns -EPROTO.\n\nReject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the\nsame way i2c-algo-bit does.","state":0,"publishedAt":"2026-09-11T19:42:06.272+00:00","modifiedAt":"2026-10-19T08:45:15.065+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/w1/slaves/w1_ds28e17.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"b30c021c6073559ea6851b522d8a17a524a27b4a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"1d08877fc37e90945df38d255715bd1d6c052d46\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"bf76d61e118b7044600a65775a3bf8adc2c6823d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"0f6496b34cc2919420f303b2aabdd9f71e084b56\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"cb55c5da9828f77db2a2701316949d4de1e9b773\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"ae0c79a8527044e54d81fd5a3b49ce6177633758\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"6df05f630c84a109736642362e452089886f9974\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebc4768ac4971eab4b570e733e47ac9dfd0e4175\",\n                            \"lessThan\": \"169ae5e65e5aaf213b6a578f6478a9fd2e523606\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/w1/slaves/w1_ds28e17.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a","https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46","https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d","https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56","https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773","https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758","https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974","https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80931","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80931","identifiers":["CVE-2026-80931"]},"retained":false,"historicalAffected":[]}],"coverage":[]}