Answer in brief
CVE-2026-89536 records a Critical severity (CVSS 9.8) vulnerability in SUNRPC: wait for in-flight client TLS handshake callback. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 9.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <15431820f448e09f8029b670d5c82aa5917d4625 || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <1de391e8b94e31b45c19c16dbf315e294810c7de || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <a89dd597458848b463d284b15e42a8078beeb046 | 15431820f448e09f8029b670d5c82aa5917d4625, 1de391e8b94e31b45c19c16dbf315e294810c7de, 7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b, a89dd597458848b463d284b15e42a8078beeb046 |
| Linux/Linuxgeneric | 6.5 | Not reported |
| Linux/Linuxgeneric | >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <fb43997407bc17ee39bac81ab708101312e255f5 || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <15431820f448e09f8029b670d5c82aa5917d4625 || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <1de391e8b94e31b45c19c16dbf315e294810c7de || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b || >=75eb6af7acdf566c68d61e98e67ee2f235201c02 <a89dd597458848b463d284b15e42a8078beeb046 | fb43997407bc17ee39bac81ab708101312e255f5, 15431820f448e09f8029b670d5c82aa5917d4625, 1de391e8b94e31b45c19c16dbf315e294810c7de, 7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b, a89dd597458848b463d284b15e42a8078beeb046 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: wait for in-flight client TLS handshake callback xs_tls_handshake_sync() gives xs_tls_handshake_done() a reference to the lower transport before submitting the handshake request. On timeout or signal, the synchronous waiter drops that reference after calling tls_handshake_cancel(). handshake_req_cancel() returns false when handshake_complete() has already marked the request complete. In that case the completion callback can still be running, so dropping the callback-owned reference in the waiter can free the lower transport before xs_tls_handshake_done() stores xprt_err or drops its own reference. If cancellation loses to completion, wait until xs_tls_handshake_done() signals handshake_done and let the callback release its reference. This mirrors the server-side handshake lifetime handling and keeps the timeout or signal return value unchanged.
Quoted source text, attributed separately from HOL analysis.