Linux azure: 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…
A vulnerability in the Linux kernel's RDMA mlx4 driver was resolved that involved misuse of Read-Copy-Update (RCU) mechanisms in the mlx4_srq_event() function. The issue could cause crashes if events are delivered before the shared receive queue (srq) object is fully initialized. The fix replaces RCU usage with spinlocks and proper reference counting to protect partially initialized objects.
AI Analysis
Technical Summary
The Linux kernel's RDMA mlx4 driver had a vulnerability due to incorrect use of RCU in mlx4_srq_event(). Although the radix_tree is RCU safe, the mlx4_srq struct was not freed or accessed within an RCU critical section, leading to potential crashes if events occurred before srq initialization completed. The fix involves using spinlocks instead of RCU, employing refcount_inc_not_zero() to guard against partially initialized objects, and ordering refcount_set() after full initialization of the srq object.
Potential Impact
This vulnerability can lead to kernel crashes and potentially allow an attacker with local privileges to cause denial of service or escalate privileges due to improper synchronization and reference counting in the mlx4 driver.
Mitigation Recommendations
A fix is available that replaces the incorrect RCU usage with spinlocks and proper reference counting. Users should update to a Linux kernel version that includes this patch. The affected versions are all versions prior to 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10. No known exploits are reported in the wild at this time.
Linux azure: 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…
Description
A vulnerability in the Linux kernel's RDMA mlx4 driver was resolved that involved misuse of Read-Copy-Update (RCU) mechanisms in the mlx4_srq_event() function. The issue could cause crashes if events are delivered before the shared receive queue (srq) object is fully initialized. The fix replaces RCU usage with spinlocks and proper reference counting to protect partially initialized objects.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.2?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]+cvm1.1?arch=source&distro=focalpkg:deb/ubuntu/[email 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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's RDMA mlx4 driver had a vulnerability due to incorrect use of RCU in mlx4_srq_event(). Although the radix_tree is RCU safe, the mlx4_srq struct was not freed or accessed within an RCU critical section, leading to potential crashes if events occurred before srq initialization completed. The fix involves using spinlocks instead of RCU, employing refcount_inc_not_zero() to guard against partially initialized objects, and ordering refcount_set() after full initialization of the srq object.
Potential Impact
This vulnerability can lead to kernel crashes and potentially allow an attacker with local privileges to cause denial of service or escalate privileges due to improper synchronization and reference counting in the mlx4 driver.
Mitigation Recommendations
A fix is available that replaces the incorrect RCU usage with spinlocks and proper reference counting. Users should update to a Linux kernel version that includes this patch. The affected versions are all versions prior to 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10. No known exploits are reported in the wild at this time.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46181
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a01d791ae9bcd3f82c803
Added to database: 07/17/2026, 10:20:07 UTC
Last enriched: 07/30/2026, 14:24:38 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 6
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