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Linux Kernel EUVDEUVD-2026-59399

| CVE-2026-72500 HIGH
2026-08-15 Linux GHSA-75wm-g4r7-3g94
Information Disclosure Linux Red Hat Suse
8.8
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
8.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Race condition requires precise NQ interrupt timing during SRQ teardown, justifying AC:H over the vendor's AC:L; all other metrics from the vendor vector are retained.

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

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 17, 2026 - 09:57 vuln.today
CVSS changed
Aug 17, 2026 - 06:22 NVD
8.8 (HIGH)
Patch available
Aug 15, 2026 - 07:20 EUVD
CVE Published
Aug 15, 2026 - 05:57 cve.org
HIGH 8.8
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: Free SRQ toggle page after firmware teardown

Free the toggle page only after firmware teardown completes so that an NQ interrupt arriving during bnxt_qplib_destroy_srq() won't write the toggle values to an already-freed page. Move free_page() after bnxt_qplib_destroy_srq().

AnalysisAI

Use-after-free race condition in the Linux kernel RDMA/bnxt_re driver allows a local attacker with low privileges to write data to a freed kernel memory page, potentially enabling privilege escalation or kernel crash. The vulnerability affects systems running the Broadcom NetXtreme-E RDMA driver across multiple stable kernel branches, with confirmed fixes in kernel versions 7.1.5, 6.18.40, and 7.2-rc1. No public exploit code has been identified and EPSS probability sits at 0.20% (10th percentile), reflecting the narrow hardware prerequisite that sharply limits the exposed population.

Technical ContextAI

The bnxt_re module is the Linux kernel RDMA driver for Broadcom NetXtreme-E network adapters. A Shared Receive Queue (SRQ) is an RDMA construct for sharing receive buffers across multiple queue pairs; a toggle page is a kernel memory page used to track queue state transitions during SRQ lifecycle operations. During SRQ teardown via bnxt_qplib_destroy_srq(), the driver previously called free_page() to release the toggle page before firmware teardown completed. A hardware Notification Queue (NQ) interrupt arriving during this window could write toggle values to the already-freed page, constituting a use-after-free write. Because freed pages can be immediately reallocated by the Linux allocator, the stale write lands in arbitrarily reused kernel memory. The vulnerability is introduced at commit 181028a0d84cdcc7ac86d05cc49eaa416ce85c8b. No CWE is formally assigned by NVD, but the root cause functionally maps to CWE-416 (Use After Free) compounded by a CWE-362 (Race Condition) between interrupt delivery and the SRQ teardown path. CPE coverage is cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*.

RemediationAI

Upgrade to a patched Linux kernel: versions 7.1.5, 6.18.40, and 7.2-rc1 contain the fix per EUVD-2026-59399. The upstream stable patches are available at https://git.kernel.org/stable/c/104a7ff382a58a83cae018925e3574c784e8274c, https://git.kernel.org/stable/c/0adcd67f3d6f84835be682da0153f57f5c2f8036, and https://git.kernel.org/stable/c/131e2918b9b0529687e67e2e58047304027f095a. Distribution-specific kernel packages tracking these stable series (RHEL, SUSE, Ubuntu, Debian) should be applied as they become available. Where immediate patching is not feasible, blacklisting the bnxt_re module via /etc/modprobe.d/ eliminates the attack surface entirely but disables all RDMA functionality on affected Broadcom adapters - evaluate impact on RDMA-dependent workloads before applying. Restricting access to RDMA device nodes (typically /dev/infiniband/) to privileged users reduces exposure but does not fully close the race condition window and should not be treated as a complete mitigation.

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Vendor StatusVendor

SUSE

Severity: Moderate
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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EUVD-2026-59399 vulnerability details – vuln.today
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