Answer in brief
CVE-2026-63893 records a High severity (CVSS 8.1) vulnerability in thunderbolt: property: Reject u32 wrap in tb_property_entry_valid(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <6a63623621639acbb39bc2d9fb09559681716695 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <9fee50c4e1e42f6d3cbe30df584f9f648f626071 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <8d4a758b407ab3de3be86d1ceadfa35d717d30c7 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <5c06a3043ad944f087bb2ae0aae28d820bb9f460 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <31b98e503ecca8077e5247253dd5425ab84bc96d || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a47784aee77f33f786dc5d7375db821bdae68792 || >=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <01deda0152066c6c955f0619114ea6afa070aaec | 6a63623621639acbb39bc2d9fb09559681716695, e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36, 9fee50c4e1e42f6d3cbe30df584f9f648f626071, 8d4a758b407ab3de3be86d1ceadfa35d717d30c7, 5c06a3043ad944f087bb2ae0aae28d820bb9f460, 31b98e503ecca8077e5247253dd5425ab84bc96d, a47784aee77f33f786dc5d7375db821bdae68792, 01deda0152066c6c955f0619114ea6afa070aaec |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.