CVE-2026-80931

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/w1/slaves/w1_ds28e17.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b30c021c6073559ea6851b522d8a17a524a27b4a", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "1d08877fc37e90945df38d255715bd1d6c052d46", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "bf76d61e118b7044600a65775a3bf8adc2c6823d", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "0f6496b34cc2919420f303b2aabdd9f71e084b56", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "cb55c5da9828f77db2a2701316949d4de1e9b773", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "ae0c79a8527044e54d81fd5a3b49ce6177633758", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "6df05f630c84a109736642362e452089886f9974", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}, {"lessThan": "169ae5e65e5aaf213b6a578f6478a9fd2e523606", "status": "affected", "version": "ebc4768ac4971eab4b570e733e47ac9dfd0e4175", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/w1/slaves/w1_ds28e17.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80931", "lastModified": "2026-10-19T09:17:24.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:18:56.893", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: ds28e17 driver out-of-bounds read via oversize I2C block read", "id": "2532277", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532277"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's w1: ds28e17 1-Wire to I2C bridge driver. A malicious I2C slave device can provide an oversized length during an I2C block read operation. This causes the driver to read beyond the allocated buffer, leading to an out-of-bounds read of up to 222 bytes. This vulnerability could allow a local attacker to disclose sensitive information or cause a denial of service."], "name": "CVE-2026-80931", "public_date": "2026-09-11T19:42:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80931\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80931\nhttps://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606\nhttps://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974\nhttps://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758\nhttps://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773"], "threat_severity": "Moderate"}

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