RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Summary

CVECVE-2026-46181
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:33 UTC
Updated2026-07-08 13:16:48 UTC
DescriptionIn 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


VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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

ReferenceSourceLinkTags
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

SourceTimeEvent
ADP2026-05-28T00:00:00.000ZReported to Red Hat.
ADP2026-05-28T00:00:00.000ZMade 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)

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