CVE-2026-46176 | BDVDB-2026-336296 Detail
LinuxLinux
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.
Weaknesses#
- CWE-825 Expired Pointer Dereference
References#
- https://git.kernel.org/stable/c/a13c2ac4d480b734342c6fbf8249fc48afd675f3
- https://git.kernel.org/stable/c/bc2cf5935b4665172235341163315905197ae91d
- https://git.kernel.org/stable/c/b087913ae88256df66620f7ba0a9776716aeef7e
- https://git.kernel.org/stable/c/6fd93142dd1d09000c3750af08270f5792523fe9
- https://git.kernel.org/stable/c/c488df06bd552bb8b6e14fa0cfd5ad986c6e9525
- https://access.redhat.com/security/cve/CVE-2026-46176
- https://bugzilla.redhat.com/show_bug.cgi?id=2482594
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46176.json
- https://access.redhat.com/errata/RHSA-2026:33215
- https://access.redhat.com/errata/RHSA-2026:33685
- https://access.redhat.com/errata/RHSA-2026:34094
- https://access.redhat.com/errata/RHSA-2026:30848
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.