CVE-2021-47012
RDMA/siw: Fix a use after free in siw_alloc_mr
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.
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Dec. 9, 2024, 6:24 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Linux kernel to a patched version.
- Reboot the system after updating the kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47012.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47012 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47012
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47012 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47012 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 09, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.3 up to (excluding) 5.4.119 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4 Changed Reference Type https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 No Types Assigned https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 Patch Changed Reference Type https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 No Types Assigned https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 Patch Changed Reference Type https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 No Types Assigned https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 Patch Changed Reference Type https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 No Types Assigned https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 Patch Changed Reference Type https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 No Types Assigned https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 Patch Changed Reference Type https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 No Types Assigned https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 Patch Changed Reference Type https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c No Types Assigned https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c Patch Changed Reference Type https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c No Types Assigned https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c Patch Changed Reference Type https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 No Types Assigned https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 Patch Changed Reference Type https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 No Types Assigned https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 Added Reference https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 Added Reference https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 Added Reference https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c Added Reference https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 28, 2024
Action Type Old Value New Value Added 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. Added Reference Linux https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 [No types assigned]