thunderbolt: property: Reject u32 wrap in tb_property_entry_valid()
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Reject u32 wrap in tb_property_entry_valid() entry->value is u32 and entry->length is u16; the sum is performed in u32 and wraps. A malicious XDomain peer can pick value = 0xffffff00, length = 0x100 so the sum 0x100000000 wraps to 0 and passes the > block_len check. tb_property_parse() then passes entry->value to parse_dwdata() as a dword offset into the property block, reading attacker-directed memory far past the allocation. For TEXT-typed entries with the "deviceid" or "vendorid" keys this lands in xd->device_name / xd->vendor_name and is readable back via the per-XDomain device_name / vendor_name sysfs attributes; the leak is NUL-bounded (kstrdup() stops at the first zero byte) and untargeted (the attacker picks a delta, not an absolute address). DATA-typed entries are parsed into property->value.data but not generically surfaced to userspace. Use check_add_overflow() so a wrapped sum is rejected.
CVE-2026-63893
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-2026-63893
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": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "6a63623621639acbb39bc2d9fb09559681716695",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "9fee50c4e1e42f6d3cbe30df584f9f648f626071",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "8d4a758b407ab3de3be86d1ceadfa35d717d30c7",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "5c06a3043ad944f087bb2ae0aae28d820bb9f460",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "31b98e503ecca8077e5247253dd5425ab84bc96d",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "a47784aee77f33f786dc5d7375db821bdae68792",
"versionType": "git"
},
{
"status": "affected",
"version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
"lessThan": "01deda0152066c6c955f0619114ea6afa070aaec",
"versionType": "git"
}
],
"programFiles": [
"drivers/thunderbolt/property.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": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/thunderbolt/property.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-63893
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40885 · Revision 1
- Added to Heist Feed
- Publisher date