Linux Kernel sunrpc rpc_sysfs_xprt_switch_add_xprt_store uninitialized variable

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel. This vulnerability affects the function rpc_sysfs_xprt_switch_add_xprt_store of the component sunrpc. The manipulation leads to uninitialized variable. This vulnerability is traded as CVE-2026-72150. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel (the affected version is unknown) and classified as very critical. This issue affects the function rpc_sysfs_xprt_switch_add_xprt_store of the component sunrpc. The manipulation with an unknown input leads to a uninitialized variable vulnerability. Using CWE to declare the problem leads to CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix uninitialized xprt_create_args structure The xprt_create_args structure is allocated on the stack without initialization in rpc_sysfs_xprt_switch_add_xprt_store(). While some fields are manually populated, critical fields like srcaddr, bc_xps, and flags contain uninitialized stack garbage. This can lead to: 1. Kernel panic when xs_setup_xprt() dereferences garbage srcaddr 2. Information leak if srcaddr points to sensitive stack data 3. Unpredictable behavior if flags has random bits set The fix is to zero-initialize the structure to ensure all unused fields are NULL/0, preventing the transport setup code from acting on garbage data.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-72150 since 08/09/2026. The exploitation is known to be easy. An attack has to be approached locally. Additional levels of successful authentication are needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Applying the patch 933654508b2bc36e2c3c086c0365e2403fb2141f/7d3ce3bd23c062a7c1c6d372d1b08e48b9e17cc3/17d90b68c3a3d7d7e95b49e1fe9381a723f637a8 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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