High · CVSS 8.1CVE-2026-89535

svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_idCVE-2026-89535

Answer in brief

CVE-2026-89535 records a High severity (CVSS 8.1) vulnerability in svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id. 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 8.1
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

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.

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
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <9f2f5d0999364c7070306cd422d8babc2621070d \|\| >=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9 \|\| >=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <4488e912973773d64368828acf3b8e39d93650ae	9f2f5d0999364c7070306cd422d8babc2621070d, cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9, 4488e912973773d64368828acf3b8e39d93650ae
Linux/Linuxgeneric	6.12	Not reported
Linux/Linuxgeneric	>=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <fcd4a752ac840d39356f4d2a424d3aca4e39716b \|\| >=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <9f2f5d0999364c7070306cd422d8babc2621070d \|\| >=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9 \|\| >=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <4488e912973773d64368828acf3b8e39d93650ae	fcd4a752ac840d39356f4d2a424d3aca4e39716b, 9f2f5d0999364c7070306cd422d8babc2621070d, cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9, 4488e912973773d64368828acf3b8e39d93650ae

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 9f2f5d0999364c7070306cd422d8babc2621070d; Linux/Linux to fcd4a752ac840d39356f4d2a424d3aca4e39716b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id svc_rdma_free() caches rdma->sc_cm_id->device before teardown, then calls rdma_destroy_id(sc_cm_id) which frees the cm_id. rpcrdma_rn_unregister() follows, but between those two calls the transport's sc_rn entry is still installed in the device's rd_xa. A concurrent ib_unregister_device walk can dispatch svc_rdma_xprt_done() against the now-freed sc_cm_id. Move rpcrdma_rn_unregister() before rdma_destroy_id() so the transport's notification entry is removed from the xarray before the cm_id it references is destroyed. Also guard the sc_cm_id dereference with a NULL check: the following patches introduce paths that reach svc_rdma_free() with sc_cm_id == NULL (listener create failure, ADDR_CHANGE replacement failure).

Quoted source text, attributed separately from HOL analysis.