7.8

CVE-2026-46181: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Modified
AliasesUBUNTU-CVE-2026-46181DEBIAN-CVE-2026-46181CGA-34v8-7jvp-c595
Published 28-05-2026Last modified 30-10-2026

Vulnerability summary

CVE-2026-46181 is a high (CVSS 7.8) Race Condition within a Thread vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 43 · Related 25
OPENSUSE-SU-2026:10954-1OPENSUSE-SU-2026:20965-1RHSA-2026:25120RHSA-2026:25121RHSA-2026:25217RHSA-2026:33900

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.14% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard5 products
  • linux-aws-6.12All versions (No fix recorded)
  • linux-azure-6.12All versions (No fix recorded)
  • linux-gcp-6.12All versions (No fix recorded)
  • linux-qemu-6.12All versions (No fix recorded)
  • linux-vmware-6.12All versions (No fix recorded)
Linux2 products
  • linux≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < 654aeddbc6e0f6e56531985bb12328ab4230c6c1 | ≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < 2d8b30b496bc53e961ba7415fd629fc27813017c | ≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < f0dbd9355ce1e93808541260c7ffab7956df9233 | ≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < 1e2a44875b6afb4add1115f7f3351dcbeb6f273d | ≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < 8b7833f3bce35cb0d01c1503781523c099c675f0 | ≥ 30353bfc43a1602c020f31d95cf27182ffd23824, < c9341307ea16b9395c2e4c9c94d8499d91fe31d0 | 4.9
  • linux_kernel≥ 4.9, < 6.18.30 | ≥ 6.19, < 7.0.7 | 7.1:rc1 | 7.1:rc2
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.115-2 | < 7.0.7-1

4 vendors · 175 products

References

40 links
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