CVE-2026-97421

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

HIGH

7.8

CVSS Score

Published: September 24, 2026 at 04:03 PM UTC

Updated: October 3, 2026 at 11:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 5.4.73v ≥ 5.8.17v ≥ 5.9.25.10 ≤ v < 5.15.2225.10 ≤ v < 6.1.1895.10 ≤ v < 6.12.1115.10 ≤ v < 6.18.535.10 ≤ v < 6.6.1585.10 ≤ v < 7.25.4.73 ≤ v < 5.55.8.17 ≤ v < 5.95.9.2 ≤ v < 5.10488229b7729d7becf4c39c5e74fb709fb35115c25.10 5.4.73 5.8.17 5.9.259f07434b297e2268f5d5c567db5b09145245cf185e40ba1c4a5246b35e91c2ed69d4680426904d7a40c20dabdf9045270767c75918feb67f0727c89

Vendor states this is fixed in 09ea6837a0434fb4db99528a5055b6d822135dcf (fixed)

Vendor states this is fixed in 3014da7587ce006cd08004fd6b257626b314e0a3 (fixed)

Vendor states this is fixed in 5fc5b73109540809b094710fac44da81dd8a3ff8 (fixed)

Vendor states this is fixed in ae3cf7d2c4d506c5c91746321644e1a08d989e2a (fixed)

Vendor states this is fixed in ddccf6cc3861de2fe60986933bead79220e0d797 (fixed)

Vendor states this is fixed in e9bbb5f5349ef560ff6f0395564f04c3aa664559 (fixed)

Vendor states this is fixed in 5.10 (unaffected)

Vendor states this is fixed in 5.15.222 (unaffected)

Affected range stops below 5.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.9, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 6.1.189 (unaffected)

Vendor states this is fixed in 6.12.111 (unaffected)