Linux Kernel up to 5.10.110/5.15.33/5.16.19/5.17.2 hfi1_mmu_rb_unregister use after free

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 5.10.110/5.15.33/5.16.19/5.17.2. Affected by this issue is the function hfi1_mmu_rb_unregister. Such manipulation leads to use after free. This vulnerability is documented as CVE-2022-49076. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.10.110/5.15.33/5.16.19/5.17.2. It has been rated as critical. Affected by this issue is the function hfi1_mmu_rb_unregister. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2022-49076 since 02/26/2025. The exploitation is known to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/25/2025).

The vulnerability scanner Nessus provides a plugin with the ID 232643 (SUSE SLES12 Security Update : kernel (SUSE-SU-2025:0834-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.111, 5.15.34, 5.16.20 or 5.17.3 eliminates this vulnerability. Applying the patch 5f54364ff6cfcd14cddf5441c4a490bb28dd69f7/9ca11bd8222a612de0d2f54d050bfcf61ae2883f/0b7186d657ee55e2cdefae498f07d5c1961e8023/5a9a1b24ddb510715f8f621263938186579a965c/2bbac98d0930e8161b1957dc0ec99de39ade1b3c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (232643). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.110
• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
• 5.15.10
• 5.15.11
• 5.15.12
• 5.15.13
• 5.15.14
• 5.15.15
• 5.15.16
• 5.15.17
• 5.15.18
• 5.15.19
• 5.15.20
• 5.15.21
• 5.15.22
• 5.15.23
• 5.15.24
• 5.15.25
• 5.15.26
• 5.15.27
• 5.15.28
• 5.15.29
• 5.15.30
• 5.15.31
• 5.15.32
• 5.15.33
• 5.16.0
• 5.16.1
• 5.16.2
• 5.16.3
• 5.16.4
• 5.16.5
• 5.16.6
• 5.16.7
• 5.16.8
• 5.16.9
• 5.16.10
• 5.16.11
• 5.16.12
• 5.16.13
• 5.16.14
• 5.16.15
• 5.16.16
• 5.16.17
• 5.16.18
• 5.16.19
• 5.17.0
• 5.17.1
• 5.17.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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