thunderbolt: Reject oversized XDomain properties responses
In 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.
CVE-2026-98687
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98687
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
"lessThan": "b270c1074860de74da0d6b5250fb06b359b9d509",
"versionType": "git"
},
{
"status": "affected",
"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
"lessThan": "a766a86ff48acee76aeb8e2575771040749e509d",
"versionType": "git"
},
{
"status": "affected",
"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
"lessThan": "2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa",
"versionType": "git"
},
{
"status": "affected",
"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
"lessThan": "737a1d2e9642d5f718bd29aa4a98b9eef3832f0a",
"versionType": "git"
},
{
"status": "affected",
"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
"lessThan": "80756e263846ab694984e749e8c626897331438f",
"versionType": "git"
}
],
"programFiles": [
"drivers/thunderbolt/xdomain.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/thunderbolt/xdomain.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98687
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48907 · Revision 1
- Added to Heist Feed
- Publisher date