Riskcovery

CVE-2026-46181

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

State
Published
Severity
7.8 High
Published
May 28, 2026
Updated
Oct 30, 2026
Reserved
May 13, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
3.17.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-366 Race Condition within a Thread

Affected Products

ProductVersions
LinuxLinux
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before 654aeddbc6e0f6e56531985bb12328ab4230c6c1Affected
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before 2d8b30b496bc53e961ba7415fd629fc27813017cAffected
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before f0dbd9355ce1e93808541260c7ffab7956df9233Affected
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before 1e2a44875b6afb4add1115f7f3351dcbeb6f273dAffected
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before 8b7833f3bce35cb0d01c1503781523c099c675f0Affected
  • 30353bfc43a1602c020f31d95cf27182ffd23824 to before c9341307ea16b9395c2e4c9c94d8499d91fe31d0Affected
LinuxLinux
  • 4.9Affected
  • before 4.9Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.160 through 6.6.*Not affected
  • 6.12.114 through 6.12.*Not affected
  • 6.18.30 through 6.18.*Not affected
  • 7.0.7 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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