RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz() (CVE-2026-97421) | HOL Guard CVE

High · CVSS 7.8CVE-2026-97421

RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()

Answer in brief

CVE-2026-97421 records a High severity (CVSS 7.8) vulnerability in RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz(). The current sources do not mark it as known exploited. The current feed maps 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 24, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae3cf7d2c4d506c5c91746321644e1a08d989e2a \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fc5b73109540809b094710fac44da81dd8a3ff8 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <09ea6837a0434fb4db99528a5055b6d822135dcf \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	ae3cf7d2c4d506c5c91746321644e1a08d989e2a, 5fc5b73109540809b094710fac44da81dd8a3ff8, 09ea6837a0434fb4db99528a5055b6d822135dcf, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to ae3cf7d2c4d506c5c91746321644e1a08d989e2a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz() Several corner cases, especially important on 32 bits: - umem->iova is u64, the function argument should pass in u64 or iova will be truncated - Check that the length is not too large for the iova - Check that lengths > 4G don't overflow the GENMASK

Quoted source text, attributed separately from HOL analysis.