{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53147", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.387Z", "datePublished": "2026-06-25T08:38:33.547Z", "dateUpdated": "2026-08-05T12:33:30.626Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:30.626Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Validate XDomain request packet size before type cast\n\ntb_xdp_handle_request() casts the received packet buffer to\nprotocol-specific structs without verifying that the allocation\nis large enough for the target type. A peer can send a minimal\nXDomain packet that passes the generic header length check but is\nshorter than the struct accessed after the cast, causing out-of-\nbounds reads from the kmemdup allocation.\n\nPlumb the packet length through xdomain_request_work and validate\nit against the expected struct size before each cast." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The vulnerable parser handles XDomain control packets from a directly connected Thunderbolt/USB4 peer on the same local fabric, not from a routable network. A malicious connected host, dock, or in-line device can send the malformed request packets.\nAC:L - The attacker controls the packet type, declared length, checksum, and payload size, and the generic header check accepts packets shorter than the later protocol-specific struct accesses. No race or condition outside attacker control is required once an XDomain peer is connected.\nPR:N - No target-system account or kernel capability is required; the packet is accepted from the external XDomain peer before any user credential check. XDomain must be enabled/allowed, but that is a platform configuration gate rather than attacker privilege.\nUI:N - After the malicious peer is connected, exploitation is driven entirely by packets sent over the Thunderbolt/USB4 control channel. No victim action such as opening a file or authorizing a user operation is required for the vulnerable parsing path.\nS:U - The impact is within the host kernel that processes the malformed XDomain packet. This is not a VM escape, IOMMU bypass, or cross-authority scope change.\nC:H - Short PROPERTIES_REQUEST packets cause reads past the kmemdup-allocated packet into adjacent kernel heap data, including UUID/offset fields used by the response logic. Under the required higher-severity rule for out-of-bounds reads, this is high confidentiality impact.\nI:N - The fixed bug is an out-of-bounds read before type-specific casts, not an out-of-bounds write or direct overwrite primitive. The affected paths may use the read value for response/link-state handling, but they do not provide attacker-controlled kernel memory modification.\nA:H - The malformed packet can drive kernel out-of-bounds heap reads from the control-channel workqueue and can be sent repeatedly by the peer. Such reads can fault or trigger kernel hardening/KASAN failures, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thunderbolt/xdomain.c" ], "versions": [ { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "a770e62923090d7572f1f5a8507ae551d354a057", "status": "affected", "versionType": "git" }, { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "0dd61ba03d05187726ecdf9c0e2175a81b9b24f6", "status": "affected", "versionType": "git" }, { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "79235c8add5da4bf27a12f5a5dbb579f300c059e", "status": "affected", "versionType": "git" }, { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "46da5c3ea011e884028a91cf913db093920a915b", "status": "affected", "versionType": "git" }, { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "07cd2787cdf8942d24a1a3ef81aa89b526fb6381", "status": "affected", "versionType": "git" }, { "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179", "lessThan": "a504b9f2797b739e0304d537e8aa4ce883ecce39", "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/thunderbolt/xdomain.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a770e62923090d7572f1f5a8507ae551d354a057" }, { "url": "https://git.kernel.org/stable/c/0dd61ba03d05187726ecdf9c0e2175a81b9b24f6" }, { "url": "https://git.kernel.org/stable/c/79235c8add5da4bf27a12f5a5dbb579f300c059e" }, { "url": "https://git.kernel.org/stable/c/46da5c3ea011e884028a91cf913db093920a915b" }, { "url": "https://git.kernel.org/stable/c/07cd2787cdf8942d24a1a3ef81aa89b526fb6381" }, { "url": "https://git.kernel.org/stable/c/a504b9f2797b739e0304d537e8aa4ce883ecce39" } ], "title": "thunderbolt: Validate XDomain request packet size before type cast", "x_generator": { "engine": "bippy-1.2.0" } } } }