High severity · published May 28, 2026
CVE-2026-46176
RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()
7.8
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.6.64 before 6.6.140; 6.11 before 6.12.88; 6.13 before 6.18.30; 6.19 before 7.0.7; 7.1; 7.1 · source: NVD
LI
Linux · Linux
b6334d2356fc0922ed01457960f74923058a353a before a13c2ac4d480b734342c6fbf8249fc48afd675f3; 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467 before bc2cf5935b4665172235341163315905197ae91d; 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467 before b087913ae88256df66620f7ba0a9776716aeef7e; 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467 before 6fd93142dd1d09000c3750af08270f5792523fe9; 5895e70f2e6e8dc67b551ca554d6fcde0a7f0467 before c488df06bd552bb8b6e14fa0cfd5ad986c6e9525; 6.6.64 before 6.6.140; +1 more · source: vendor
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9.6 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46176
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46176
Patch
https://git.kernel.org/stable/c/6fd93142dd1d09000c3750af08270f5792523fe9
Patch
https://git.kernel.org/stable/c/a13c2ac4d480b734342c6fbf8249fc48afd675f3
Patch
https://git.kernel.org/stable/c/b087913ae88256df66620f7ba0a9776716aeef7e
Patch
https://git.kernel.org/stable/c/bc2cf5935b4665172235341163315905197ae91d
Patch
https://git.kernel.org/stable/c/c488df06bd552bb8b6e14fa0cfd5ad986c6e9525
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:30848
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