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  4. CVE 2026 89545 sunrpc defer rqargp and rqresp free until after
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Back to active CVEs
High · CVSS 7.8CVE-2026-89545

sunrpc: defer rq_argp and rq_resp free until after RCU grace periodCVE-2026-89545

Answer in brief

CVE-2026-89545 records a High severity (CVSS 7.8) vulnerability in sunrpc: defer rq_argp and rq_resp free until after RCU grace period. 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.

Published Sep 11, 2026Updated Oct 19, 2026Source checked Oct 27, 2026First seen by HOL Sep 11, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. 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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=812443865c5fc255363d4a684a62c086af1addca <08bc49e0541260bf294962cf889a32a2d2713ad6 || >=812443865c5fc255363d4a684a62c086af1addca <e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090 || >=812443865c5fc255363d4a684a62c086af1addca <c479bde671cbe2f9e152834a8b0eb7c3c295bbaf08bc49e0541260bf294962cf889a32a2d2713ad6, e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090, c479bde671cbe2f9e152834a8b0eb7c3c295bbaf
Linux/Linuxgeneric3.19Not reported
Linux/Linuxgeneric>=812443865c5fc255363d4a684a62c086af1addca <0ea49d69aa806008b2424c8cf21cf746b9963967 || >=812443865c5fc255363d4a684a62c086af1addca <08bc49e0541260bf294962cf889a32a2d2713ad6 || >=812443865c5fc255363d4a684a62c086af1addca <e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090 || >=812443865c5fc255363d4a684a62c086af1addca <c479bde671cbe2f9e152834a8b0eb7c3c295bbaf0ea49d69aa806008b2424c8cf21cf746b9963967, 08bc49e0541260bf294962cf889a32a2d2713ad6, e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090, c479bde671cbe2f9e152834a8b0eb7c3c295bbaf

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 08bc49e0541260bf294962cf889a32a2d2713ad6; Linux/Linux to 0ea49d69aa806008b2424c8cf21cf746b9963967 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 11, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: sunrpc: defer rq_argp and rq_resp free until after RCU grace period svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously via kfree(), but defers the rqstp struct free via kfree_rcu(). After svc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is a window where RCU readers that started before list_del_rcu() can still traverse the thread list and find the rqstp. These readers (e.g. nfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has already been freed — a use-after-free. Fix this by moving the kfree of rq_argp and rq_resp into an explicit call_rcu() callback alongside the struct free. Resources not accessed by RCU readers (bvec, buffer pages, scratch folio, auth_data) remain synchronously freed.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 27, 2026
References
4 linked sources
Open source record