7.8

CVE-2026-46176: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()

Modified
AliasesUBUNTU-CVE-2026-46176DEBIAN-CVE-2026-46176
Published 28-05-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-46176 is a high (CVSS 7.8) Expired Pointer Dereference vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.5% 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 · -0.04 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 44 · Related 37
OPENSUSE-SU-2026:10954-1OPENSUSE-SU-2026:20965-1RHSA-2026:30848RHSA-2026:33215RHSA-2026:33685RHSA-2026:34094

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init() mlx5_ib_dev_res_srq_init() allocates two SRQs, s0 and s1. When ib_create_srq() fails for s1, the error branch destroys s0 but falls through and unconditionally assigns the freed s0 and the ERR_PTR s1 to devr->s0 and devr->s1. This leads to several problems: the lock-free fast path checks "if (devr->s1) return 0;" and treats the ERR_PTR as already initialised; users in mlx5_ib_create_qp() dereference the freed SRQ or ERR_PTR via to_msrq(devr->s0)->msrq.srqn; and mlx5_ib_dev_res_cleanup() dereferences the ERR_PTR and double-frees s0 on teardown. Fix by adding the same `goto unlock` in the s1 failure path.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.18% 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.

Ubuntu139 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded) | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1061.64 | All 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)
Linux2 products
  • linux≥ b6334d2356fc0922ed01457960f74923058a353a, < a13c2ac4d480b734342c6fbf8249fc48afd675f3 | ≥ 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467, < bc2cf5935b4665172235341163315905197ae91d | ≥ 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467, < b087913ae88256df66620f7ba0a9776716aeef7e | ≥ 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467, < 6fd93142dd1d09000c3750af08270f5792523fe9 | ≥ 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467, < c488df06bd552bb8b6e14fa0cfd5ad986c6e9525 | ≥ 6.6.64, < 6.6.140 | 6.11
  • linux_kernel≥ 6.6.64, < 6.6.140 | ≥ 6.11, < 6.12.88 | ≥ 6.13, < 6.18.30 | ≥ 6.19, < 7.0.7 | 7.1:rc1 | 7.1:rc2
Debian1 product
  • linux< 6.12.88-1 | < 7.0.7-1

3 vendors · 142 products

References

42 links
Show all 42 references