CVE-2021-47012 (GCVE-0-2021-47012)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2025-05-04 07:02
VLAI?
Title
RDMA/siw: Fix a use after free in siw_alloc_mr
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2251334dcac9eb337575d8767e2a6a7e81848f7f , < 30b9e92d0b5e5d5dc1101ab856c17009537cbca4 (git)
Affected: 2251334dcac9eb337575d8767e2a6a7e81848f7f , < 608a4b90ece039940e9425ee2b39c8beff27e00c (git)
Affected: 2251334dcac9eb337575d8767e2a6a7e81848f7f , < 3e22b88e02c194f6c80867abfef5cc09383461f4 (git)
Affected: 2251334dcac9eb337575d8767e2a6a7e81848f7f , < ad9ce7188432650469a6c7625bf479f5ed0b6155 (git)
Affected: 2251334dcac9eb337575d8767e2a6a7e81848f7f , < 3093ee182f01689b89e9f8797b321603e5de4f63 (git)
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    Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.119 , ≤ 5.4.* (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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