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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00042.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
2251334dcac9eb337575d8767e2a6a7e81848f7f affected
< 30b9e92d0b5e5d5dc1101ab856c17009537cbca4
2251334dcac9eb337575d8767e2a6a7e81848f7f affected
< 608a4b90ece039940e9425ee2b39c8beff27e00c
2251334dcac9eb337575d8767e2a6a7e81848f7f affected
< 3e22b88e02c194f6c80867abfef5cc09383461f4
2251334dcac9eb337575d8767e2a6a7e81848f7f affected
< ad9ce7188432650469a6c7625bf479f5ed0b6155
2251334dcac9eb337575d8767e2a6a7e81848f7f affected
< 3093ee182f01689b89e9f8797b321603e5de4f63
Linux Linux affected
Version Status Constraints
5.3 affected
—
0 unaffected
< 5.3
5.4.119 unaffected
≤ 5.4.*
5.10.37 unaffected
≤ 5.10.*
5.11.21 unaffected
≤ 5.11.*
5.12.4 unaffected
≤ 5.12.*
5.13 unaffected
≤ *

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 cve-icon cve-icon
https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 cve-icon cve-icon
https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 cve-icon cve-icon
https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c cve-icon cve-icon
https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024022831-CVE-2021-47012-73c5@gregkh/T/#u cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47012 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47012 cve-icon
History

Mon, 09 Dec 2024 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
Metrics cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H'}

 cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Mon, 04 Nov 2024 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T07:02:17.847Z

Reserved: 2024-02-27T18:42:55.953Z

Link: CVE-2021-47012

cve-icon Vulnrichment

Updated: 2024-08-04T05:24:39.841Z

cve-icon NVD

Status : Analyzed

Published: 2024-02-28T09:15:38.753

Modified: 2024-12-09T18:24:59.420

Link: CVE-2021-47012

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-02-28T00:00:00Z

Links: CVE-2021-47012 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses