{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98687", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.364Z", "datePublished": "2026-10-18T15:45:58.719Z", "dateUpdated": "2026-10-21T12:55:42.401Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:55:42.401Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Reject oversized XDomain properties responses\n\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer. The XDomain length field is six bits wide,\nhowever, and a malicious peer can set it to 63. After the fixed response\nfields are subtracted, the driver treats this as 48 data dwords.\n\nCommit 322e93448d90 (\"thunderbolt: Clamp XDomain response data copy to\nallocation size\") only bounds the copy against data_len. If data_len is\nat least 48, memcpy() reads 192 bytes from the 180-byte res->data array,\ncausing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478\n(\"thunderbolt: Limit XDomain response copy to actual frame size\") limits\nthe earlier copy but does not constrain this header-derived length.\n\nReject response data lengths that exceed the allocated source buffer\nbefore copying them into the assembled property block."}], "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": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "b270c1074860de74da0d6b5250fb06b359b9d509", "status": "affected", "versionType": "git"}, {"version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "a766a86ff48acee76aeb8e2575771040749e509d", "status": "affected", "versionType": "git"}, {"version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa", "status": "affected", "versionType": "git"}, {"version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "737a1d2e9642d5f718bd29aa4a98b9eef3832f0a", "status": "affected", "versionType": "git"}, {"version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "80756e263846ab694984e749e8c626897331438f", "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": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "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": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b270c1074860de74da0d6b5250fb06b359b9d509"}, {"url": "https://git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d"}, {"url": "https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa"}, {"url": "https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a"}, {"url": "https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f"}], "title": "thunderbolt: Reject oversized XDomain properties responses", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/thunderbolt/xdomain.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b270c1074860de74da0d6b5250fb06b359b9d509", "status": "affected", "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "versionType": "git"}, {"lessThan": "a766a86ff48acee76aeb8e2575771040749e509d", "status": "affected", "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "versionType": "git"}, {"lessThan": "2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa", "status": "affected", "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "versionType": "git"}, {"lessThan": "737a1d2e9642d5f718bd29aa4a98b9eef3832f0a", "status": "affected", "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "versionType": "git"}, {"lessThan": "80756e263846ab694984e749e8c626897331438f", "status": "affected", "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/thunderbolt/xdomain.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": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "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\nthunderbolt: Reject oversized XDomain properties responses\n\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer. The XDomain length field is six bits wide,\nhowever, and a malicious peer can set it to 63. After the fixed response\nfields are subtracted, the driver treats this as 48 data dwords.\n\nCommit 322e93448d90 (\"thunderbolt: Clamp XDomain response data copy to\nallocation size\") only bounds the copy against data_len. If data_len is\nat least 48, memcpy() reads 192 bytes from the 180-byte res->data array,\ncausing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478\n(\"thunderbolt: Limit XDomain response copy to actual frame size\") limits\nthe earlier copy but does not constrain this header-derived length.\n\nReject response data lengths that exceed the allocated source buffer\nbefore copying them into the assembled property block."}], "id": "CVE-2026-98687", "lastModified": "2026-10-21T13:21:37.293", "metrics": {}, "published": "2026-10-18T16:17:22.097", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b270c1074860de74da0d6b5250fb06b359b9d509"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: thunderbolt: Reject oversized XDomain properties responses", "id": "2555178", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555178"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nthunderbolt: Reject oversized XDomain properties responses\ntb_xdp_properties_request() allocates room for 45 data dwords in its\n252-byte response buffer. The XDomain length field is six bits wide,\nhowever, and a malicious peer can set it to 63. After the fixed response\nfields are subtracted, the driver treats this as 48 data dwords.\nCommit 322e93448d90 (\"thunderbolt: Clamp XDomain response data copy to\nallocation size\") only bounds the copy against data_len. If data_len is\nat least 48, memcpy() reads 192 bytes from the 180-byte res->data array,\ncausing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478\n(\"thunderbolt: Limit XDomain response copy to actual frame size\") limits\nthe earlier copy but does not constrain this header-derived length.\nReject response data lengths that exceed the allocated source buffer\nbefore copying them into the assembled property block.", "A flaw was found in the Linux kernel's Thunderbolt driver. When processing property requests from peer devices, the driver fails to verify that the response data length does not exceed the allocated buffer size. A malicious peer can exploit this flaw by sending an oversized response packet, triggering an out-of-bounds read from heap memory. This issue may allow an attacker to disclose sensitive kernel memory or cause a Denial of Service (DoS) by crashing the system."], "name": "CVE-2026-98687", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98687\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98687\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98687.mbox"], "threat_severity": "Moderate"}