Answer in brief
CVE-2026-89691 records a High severity (CVSS 7.1) vulnerability in nfsd: clear opcnt on compound arg release to prevent OOB read. 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 7.1. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bd9d6a3efa9709e653aafbeb859289feccb8e70c <58bcdfb2b2e412088839ae740b1a95154dc0b8d0 || >=bd9d6a3efa9709e653aafbeb859289feccb8e70c <e879148867bd4c4cac42e063ffaffa187dddc6fe || >=bd9d6a3efa9709e653aafbeb859289feccb8e70c <c1a4f7b1848f95302df598217e1c7a1410c2d0c5 || >=bd9d6a3efa9709e653aafbeb859289feccb8e70c <ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a | 58bcdfb2b2e412088839ae740b1a95154dc0b8d0, e879148867bd4c4cac42e063ffaffa187dddc6fe, c1a4f7b1848f95302df598217e1c7a1410c2d0c5, ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a |
| Linux/Linuxgeneric | 6.7 | Not reported |
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: nfsd: clear opcnt on compound arg release to prevent OOB read nfsd4_release_compoundargs() resets args->ops to the inline iops[8] array when the dynamically-allocated ops buffer is freed, but leaves args->opcnt at its original value (which can be up to 200 for NFSv4.1+ compounds). If rq_status_counter is stuck at an odd value (which can happen when nfsd_dispatch() hits an error path after setting it odd), the RPC status dumpit handler reads min(opcnt, 16) entries from args->ops[]. Since iops only has 8 elements and is the last field in struct nfsd4_compoundargs, reading indices 8-15 accesses adjacent slab memory and leaks it to userspace via netlink. Zero opcnt unconditionally in nfsd4_release_compoundargs() so stale compound metadata is never exposed through the status interface. [ cel: Remove the kvfree_rcu_mightsleep() sleep from the exposure window ]
Quoted source text, attributed separately from HOL analysis.