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Ubuntu: (CVE-2021-47012): linux vulnerability

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Ubuntu: (CVE-2021-47012): linux vulnerability

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
02/28/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

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.

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4

References

  • https://attackerkb.com/topics/cve-2021-47012
  • CVE - 2021-47012
  • https://git.kernel.org/linus/3093ee182f01689b89e9f8797b321603e5de4f63
  • https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63
  • https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4
  • https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4
  • https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c
  • https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155
  • https://www.cve.org/CVERecord?id=CVE-2021-47012
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