RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
Summary
| CVE | CVE-2026-46181 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-28 10:16:33 UTC |
| Updated | 2026-07-08 13:16:48 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees the mlx4_srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing. Use the spinlock since it isn't easy to make RCU work, use refcount_inc_not_zero() to protect against partially initialized objects, and order the refcount_set() to be after the srq is fully initialized. |
Risk And Classification
Primary CVSS: v3.1 7 HIGH from ADP
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000130000 probability, percentile 0.022500000 (date 2026-06-03)
Problem Types: NVD-CWE-noinfo | CWE-366 | CWE-366 Race Condition within a Thread
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 30353bfc43a1602c020f31d95cf27182ffd23824 1e2a44875b6afb4add1115f7f3351dcbeb6f273d git | Not specified |
| CNA | Linux | Linux | affected 30353bfc43a1602c020f31d95cf27182ffd23824 8b7833f3bce35cb0d01c1503781523c099c675f0 git | Not specified |
| CNA | Linux | Linux | affected 30353bfc43a1602c020f31d95cf27182ffd23824 c9341307ea16b9395c2e4c9c94d8499d91fe31d0 git | Not specified |
| CNA | Linux | Linux | affected 4.9 | Not specified |
| CNA | Linux | Linux | unaffected 4.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.30 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.7 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Server V. 7 ELS | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Server Optional V. 7 ELS | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream E4S V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS AUS V.8.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS EXTENSION V.8.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS AUS V.8.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS EXTENSION V.8.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.8.8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS TUS V.8.8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CRB V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat CodeReady Linux Builder EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux NFV V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV E4S V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux RT V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time E4S V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46181.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25217 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:35894 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34095 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25120 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:35896 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| access.redhat.com/errata/RHSA-2026:35863 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34443 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-46181 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:33900 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36216 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25121 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| access.redhat.com/errata/RHSA-2026:34094 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-05-28T00:00:00.000Z | Reported to Red Hat. |
| ADP | 2026-05-28T00:00:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:36216: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS)
ADP: RHSA-2026:34095: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:34443: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)
ADP: RHSA-2026:34094: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)
ADP: RHSA-2026:25217: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)
ADP: RHSA-2026:25121: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)
ADP: RHSA-2026:35896: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
ADP: RHSA-2026:35894: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
ADP: RHSA-2026:35863: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)
ADP: RHSA-2026:25120: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)
ADP: RHSA-2026:33900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)