Answer in brief
CVE-2026-68119 records a High severity (CVSS 7.5) vulnerability in tcp: initialize standalone TCP-AO response padding. 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 7.5. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=decde2586b34b99684faff1eab41e5c496c27fb6 <bbb7db8c74b0b5d17a695136f0f0806ecd0118f6 || >=decde2586b34b99684faff1eab41e5c496c27fb6 <fadaff3f66e124c3a62237f9c881819a8ac90309 || >=decde2586b34b99684faff1eab41e5c496c27fb6 <a859b280441fb02f64ed4037f03d5c0c34a7a595 || >=decde2586b34b99684faff1eab41e5c496c27fb6 <e1a9d3cc11829c5414a75eb39c704f461936eb24 | bbb7db8c74b0b5d17a695136f0f0806ecd0118f6, fadaff3f66e124c3a62237f9c881819a8ac90309, a859b280441fb02f64ed4037f03d5c0c34a7a595, e1a9d3cc11829c5414a75eb39c704f461936eb24 |
| Linux/Linuxgeneric | 6.7 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
In the Linux kernel, the following vulnerability has been resolved: tcp: initialize standalone TCP-AO response padding tcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP responses with TCP-AO options. The option length carries the actual MAC length, but the TCP header length includes the option rounded up to a four-byte boundary. tcp_ao_hash_hdr() writes the MAC only. Thus, when the MAC length is not four-byte aligned, the one to three bytes after the MAC are left uninitialized and may be transmitted. For the normal TCP-AO hashing mode, those bytes also have to be initialized before computing the MAC. Initialize only the alignment padding in the TCP-AO branches, before hashing the header. Use TCPOPT_NOP, as in the normal TCP-AO output path. This avoids adding work to non-AO TCP responses while preserving a valid authenticated header.
Quoted source text, attributed separately from HOL analysis.