Bug 2516628 (CVE-2026-72150)

Summary: CVE-2026-72150 kernel: sunrpc: fix uninitialized xprt_create_args structure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's sunrpc component. The `xprt_create_args` structure is allocated on the stack without initialization in `rpc_sysfs_xprt_switch_add_xprt_store()`. This can lead to critical fields containing uninitialized stack garbage. Exploiting this vulnerability can result in a kernel panic, causing a denial of service, or an information leak, potentially exposing sensitive stack data.
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Description OSIDB Bzimport 2026-08-15 06:22:45 UTC 
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.
Comment 1 Keith Grant 2026-08-18 12:56:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081534-CVE-2026-72150-fe35@gregkh/T