Linux Kernel up to 5.17.3 tcmu_try_get_data_page cmdr_lock reference count

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.17.3 and classified as problematic. Affected by this issue is the function tcmu_try_get_data_page. Executing a manipulation of the argument cmdr_lock can lead to reference count. The identification of this vulnerability is CVE-2022-49053. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.17.3 and classified as problematic. This vulnerability affects the function tcmu_try_get_data_page. The manipulation of the argument cmdr_lock with an unknown input leads to a reference count vulnerability. The CWE definition for the vulnerability is CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: scsi: target: tcmu: Fix possible page UAF tcmu_try_get_data_page() looks up pages under cmdr_lock, but it does not take refcount properly and just returns page pointer. When tcmu_try_get_data_page() returns, the returned page may have been freed by tcmu_blocks_release(). We need to get_page() under cmdr_lock to avoid concurrent tcmu_blocks_release().

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2022-49053 since 02/26/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 234182 (SUSE SLES15 Security Update : kernel (SUSE-SU-2025:1195-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.276, 4.19.239, 5.4.190, 5.10.112, 5.15.35 or 5.17.4 eliminates this vulnerability. Applying the patch d7c5d79e50be6e06b669141e3db1f977a0dd4e8e/e3e0e067d5b34e4a68e3cc55f8eebc413f56f8ed/fb7a5115422fbd6a4d505e8844f1ef5529f10489/aec36b98a1bbaa84bfd8299a306e4c12314af626/b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322/a9564d84ed9f6ee71017d062d0d2182154294a4b/a6968f7a367f128d120447360734344d5a3d5336 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 databases at Tenable (234182) and EUVD (EUVD-2022-55151). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.14.275
• 4.19.238
• 5.4.189
• 5.10.111
• 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
• 5.15.34
• 5.17.0
• 5.17.1
• 5.17.2
• 5.17.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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