RDMA/siw: Fix a use after free in siw_alloc_mr
Summary
| CVE | CVE-2021-47012 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-02-28 09:15:38 UTC |
| Updated | 2026-08-04 10:16:41 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix a use after free in siw_alloc_mr Our code analyzer reported a UAF. In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the err_out branch of siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr). My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {} section, to avoid the uaf. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Problem Types: CWE-416
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 2251334dcac9eb337575d8767e2a6a7e81848f7f 30b9e92d0b5e5d5dc1101ab856c17009537cbca4 git | Not specified |
| CNA | Linux | Linux | affected 2251334dcac9eb337575d8767e2a6a7e81848f7f 608a4b90ece039940e9425ee2b39c8beff27e00c git | Not specified |
| CNA | Linux | Linux | affected 2251334dcac9eb337575d8767e2a6a7e81848f7f 3e22b88e02c194f6c80867abfef5cc09383461f4 git | Not specified |
| CNA | Linux | Linux | affected 2251334dcac9eb337575d8767e2a6a7e81848f7f ad9ce7188432650469a6c7625bf479f5ed0b6155 git | Not specified |
| CNA | Linux | Linux | affected 2251334dcac9eb337575d8767e2a6a7e81848f7f 3093ee182f01689b89e9f8797b321603e5de4f63 git | Not specified |
| CNA | Linux | Linux | affected 5.3 | Not specified |
| CNA | Linux | Linux | unaffected 5.3 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.4.119 5.4.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.37 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.11.21 5.11.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.12.4 5.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.13 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.