{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80931", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.802Z", "datePublished": "2026-09-11T19:42:06.272Z", "dateUpdated": "2026-10-19T08:45:15.065Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:15.065Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The overflow is reached from local userspace via /dev/i2c-* I2C_SMBUS or I2C_RDWR ioctls into w1_f19_i2c_master_transfer() on the DS28E17-created I2C adapter; i2c-dev does not require advertised I2C_FUNC_SMBUS_READ_BLOCK_DATA. There is no network path; the 1-Wire-to-I2C bridge being present is a deployment precondition.\nAC:L - A single I2C_M_RECV_LEN block read uses the downstream slave's first data byte as the extra length with no cap, then w1_f19_i2c_read() copies that many bytes. The attacker chooses the ioctl and target address; a responding slave returning >32 (or data the attacker just wrote) overflows reliably, with no race or uncontrolled layout.\nPR:L - i2cdev_open() has no capability check; reachability depends only on /dev/i2c-* permissions, commonly 0660 root:i2c on embedded and industrial systems. That is unprivileged local access, not real init-namespace root.\nUI:N - The attacker triggers the bug with their own open/ioctl sequence on an already-present DS28E17 I2C adapter node. No victim action such as plugging in a device or mounting a filesystem is required.\nS:U - Impact is ordinary host-kernel stack or heap corruption of the SMBus/i2c-dev transfer buffer within the same kernel authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - A device-supplied length up to 255 causes an out-of-bounds write of about 222 bytes past the 34-byte I2C_SMBUS_BLOCK_MAX+2 buffer into adjacent kernel stack or heap. That memory corruption is defensibly leveraged for kernel information disclosure.\nI:H - Slave-controlled bytes are written past the end of the kernel transfer buffer, producing a substantial out-of-bounds kernel write. Such corruption is exploitable for arbitrary memory modification or control-flow hijacking.\nA:H - The out-of-bounds kernel write can corrupt heap or stack state and cause an oops, panic, or hang. The attacker can repeat the local ioctl to deny service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/w1/slaves/w1_ds28e17.c" ], "versions": [ { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "b30c021c6073559ea6851b522d8a17a524a27b4a", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "1d08877fc37e90945df38d255715bd1d6c052d46", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "bf76d61e118b7044600a65775a3bf8adc2c6823d", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "0f6496b34cc2919420f303b2aabdd9f71e084b56", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "cb55c5da9828f77db2a2701316949d4de1e9b773", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "ae0c79a8527044e54d81fd5a3b49ce6177633758", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "6df05f630c84a109736642362e452089886f9974", "status": "affected", "versionType": "git" }, { "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "lessThan": "169ae5e65e5aaf213b6a578f6478a9fd2e523606", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/w1/slaves/w1_ds28e17.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a" }, { "url": "https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46" }, { "url": "https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d" }, { "url": "https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56" }, { "url": "https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773" }, { "url": "https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758" }, { "url": "https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974" }, { "url": "https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606" } ], "title": "w1: ds28e17: reject an oversize length on an I2C block read", "x_generator": { "engine": "bippy-1.2.0" } } } }