GHSA-RQ3J-RW4P-W59W
Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-30 15:33In the Linux kernel, the following vulnerability has been resolved:
thunderbolt: Reject oversized XDomain properties responses
tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords.
Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length.
Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.
{
"affected": [],
"aliases": [
"CVE-2026-98687"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:22Z",
"severity": null
},
"details": "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-\u003edata 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": "GHSA-rq3j-rw4p-w59w",
"modified": "2026-10-30T15:33:55Z",
"published": "2026-10-18T18:31:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98687"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/37ea4304bd9f57ebe719409f010915495467f05c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7c028d2ae85eca86b82cab1163a9ac1187a2e666"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9fba032802b5858bc6186b34f8e966429ff155ab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a766a86ff48acee76aeb8e2575771040749e509d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b270c1074860de74da0d6b5250fb06b359b9d509"
}
],
"schema_version": "1.4.0",
"severity": []
}
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