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Linux Kernel EUVDEUVD-2026-55603

| CVE-2026-68417 HIGH
2026-08-10 Linux GHSA-f5gm-g4v9-mv95
Information Disclosure Linux
7.8
CVSS 3.1 · Vendor: Linux
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Severity by source

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

Race condition requires timing precision (AC:H); local access with low privileges needed to use RDMA device interface; full kernel memory impact if race is won.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/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
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 14, 2026 - 02:42 vuln.today
CVSS changed
Aug 13, 2026 - 23:37 NVD
7.8 (HIGH)
Patch available
Aug 10, 2026 - 14:18 EUVD
CVE Published
Aug 10, 2026 - 12:04 cve.org
HIGH 7.8
CVE Published
Aug 10, 2026 - 12:04 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

RDMA/siw: publish QP after initialization

siw_create_qp() currently calls siw_qp_add() before the queues, CQ pointers, state, completion, and device list entry are ready. A QPN lookup can therefore reach a QP that is still being constructed.

Move siw_qp_add() to the end of siw_create_qp(), after QP initialization and before adding the QP to the siw device list.

AnalysisAI

Race condition in the Linux kernel RDMA/siw (Software iWARP) subsystem exposes partially-constructed Queue Pair (QP) objects to concurrent lookups during QP creation. Affected kernels from 5.3 onward allow a local, low-privileged user on systems with the siw driver loaded to trigger a QPN lookup that resolves to a QP whose queues, CQ pointers, state, and device list entry have not yet been initialized. This can result in kernel memory corruption, information disclosure, or system availability loss - all three impact dimensions confirmed by the CVSS C:H/I:H/A:H rating. No public exploit or active exploitation (CISA KEV) has been identified; EPSS is 0.16% at the 5th percentile.

Technical ContextAI

The siw module (Software iWARP) provides an RDMA (Remote Direct Memory Access) implementation over standard TCP/IP in the Linux kernel. When a Queue Pair (QP) is created via siw_create_qp(), the implementation incorrectly calls siw_qp_add() - which publishes the QP's identifier into a globally accessible lookup table - before the QP's internal state (receive/send queues, completion queue pointers, atomic state machine, device list linkage) is fully initialized. A concurrent thread performing a QPN lookup during this window can obtain a pointer to the uninitialized QP structure and operate on it, constituting a classic use-before-initialization race (effectively CWE-362 / CWE-908, though NVD lists CWE as N/A). CPE data confirms affected product as cpe:2.3:a:linux:linux:*. The siw driver was introduced in Linux 5.3, establishing the lower bound of affected kernels.

RemediationAI

Upgrade the Linux kernel to a patched stable release: 6.6.148 or later for the 6.6 LTS branch, 6.12.101 or later for the 6.12 LTS branch, 6.18.42 or later for the 6.18 branch, 7.1.6 or later for 7.1, or 7.2-rc4 or later for the mainline release candidate. Patch commits are available at https://git.kernel.org/stable/c/36e91a58397ca8c978e38a0bf389f0c6113fa8ca (6.6), https://git.kernel.org/stable/c/52f9fcb191143448df55fd215ff09c5207fed43e (6.12), https://git.kernel.org/stable/c/bb27fcc67c429d97f785c92c35a6c5adebb05d7f (6.18), https://git.kernel.org/stable/c/fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d (7.1), and https://git.kernel.org/stable/c/74912ad168f87d6b2b670a87987bb302d6e64aa1 (7.2-rc). For systems that cannot be patched immediately, unloading or blacklisting the siw kernel module (modprobe -r siw and adding blacklist siw to /etc/modprobe.d/) eliminates the attack surface entirely with the trade-off of disabling Software iWARP RDMA functionality. On systems not using RDMA at all, this workaround has no operational impact.

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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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EUVD-2026-55603 vulnerability details – vuln.today
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