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Linux Kernel CVE-2026-72496

| EUVDEUVD-2026-59395 CRITICAL
2026-08-15 Linux GHSA-hg58-cc7q-mhx9
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.2 Vendor: Linux
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Severity by source

Sources disagree (Low–Critical)
Vendor (Linux) PRIMARY
9.2 CRITICAL
AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
vuln.today AI
4.7 MEDIUM

Local access to the RDMA device (AV:L, PR:L), reachable only when ioremap fails under memory pressure (AC:H), and realistic impact is a kernel crash (A:H) with no direct confidentiality or integrity loss.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 17, 2026 - 09:54 vuln.today
CVSS changed
Aug 17, 2026 - 06:22 NVD
9.2 (CRITICAL)
Patch available
Aug 15, 2026 - 07:20 EUVD
CVE Published
Aug 15, 2026 - 05:57 cve.org
CRITICAL 9.2
CVE Published
Aug 15, 2026 - 05:57 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

RDMA/bnxt_re: Proper rollback if the ioremap fails

bnxt_qplib_alloc_dpi returns success even if ioremap fails. Add the proper rollback when the ioremap fails and return -ENOMEM status.

AnalysisAI

Improper error handling in the Linux kernel's RDMA/bnxt_re driver (Broadcom NetXtreme RoCE) causes bnxt_qplib_alloc_dpi() to report success even when the underlying ioremap() call fails, leaving callers to operate on an unmapped/invalid Doorbell Page Index resource. Affected kernels are 6.5 and later on systems using the bnxt_re driver with Broadcom RDMA-capable NICs. There is no public exploit identified at time of analysis, it is not in CISA KEV, and EPSS is very low (0.15%), so the practical risk is confined to local DoS/robustness rather than remote compromise, despite the high assigned CVSS of 9.2.

Technical ContextAI

The vulnerability lives in the InfiniBand/RDMA stack, specifically the bnxt_re provider driver that supports RoCE (RDMA over Converged Ethernet) on Broadcom NetXtreme-E adapters. During Doorbell Page Index (DPI) allocation, the driver maps a device memory region via ioremap(); the fix corrects a path where bnxt_qplib_alloc_dpi() returned 0 (success) even if that mapping failed, instead of rolling back allocated state and returning -ENOMEM. The root cause is a missing-error-check / improper-rollback class of bug (unchecked return value leading to use of an invalid I/O mapping); NVD lists the CWE as N/A, but this maps conceptually to CWE-252/CWE-690 (unchecked return value) and can manifest as a NULL/invalid pointer dereference. The provided tag 'Information Disclosure' is not clearly supported by the description, which describes a resource-mapping failure path rather than a data-leak primitive.

RemediationAI

Upstream fix available (stable commits 87267803a8c824616eb147c5dad7030a5db6f878 and 303f6fef95df5e5316970746d861cf6daeeca77f); update to a Linux stable kernel that includes these commits (patched in the 7.1.5 / 7.2-rc1 series and any distribution kernel that has backported them) via your distribution's kernel update channel. If you cannot patch immediately and do not use Broadcom RoCE/RDMA, a concrete compensating control is to avoid loading the driver - blacklist the bnxt_re module (e.g. via /etc/modprobe.d) so the vulnerable DPI-allocation path is never reached; the trade-off is loss of RDMA/RoCE offload on Broadcom NetXtreme-E NICs, which matters for HPC/storage fabrics but is inconsequential on general-purpose servers that only use the NIC for standard Ethernet. Confirm exact fixed version against your distribution's advisory before scheduling. Reference commits: https://git.kernel.org/stable/c/87267803a8c824616eb147c5dad7030a5db6f878.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-72496 vulnerability details – vuln.today
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