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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.
Metrics
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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
New CVE Received from kernel.org2/28/2024 4:15:38 AM
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/3093ee182f01689b89e9f8797b321603e5de4f63 [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 [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/608a4b90ece039940e9425ee2b39c8beff27e00c [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2021-47012 NVD
Published Date: 02/28/2024 NVD
Last Modified: 06/17/2026
Source: kernel.org
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