CVE-2025-38544
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-16

Last updated on: 2025-11-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix bug due to prealloc collision When userspace is using AF_RXRPC to provide a server, it has to preallocate incoming calls and assign to them call IDs that will be used to thread related recvmsg() and sendmsg() together. The preallocated call IDs will automatically be attached to calls as they come in until the pool is empty. To the kernel, the call IDs are just arbitrary numbers, but userspace can use the call ID to hold a pointer to prepared structs. In any case, the user isn't permitted to create two calls with the same call ID (call IDs become available again when the call ends) and EBADSLT should result from sendmsg() if an attempt is made to preallocate a call with an in-use call ID. However, the cleanup in the error handling will trigger both assertions in rxrpc_cleanup_call() because the call isn't marked complete and isn't marked as having been released. Fix this by setting the call state in rxrpc_service_prealloc_one() and then marking it as being released before calling the cleanup function.
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Meta Information
Published
2025-08-16
Last Modified
2025-11-18
Generated
2026-05-07
AI Q&A
2025-08-16
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38544
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-617 The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability involves a bug in the Linux kernel's rxrpc subsystem related to preallocating call IDs for incoming calls when using AF_RXRPC in userspace. The issue arises because the kernel allows call IDs to be reused only after a call ends, but due to improper state handling during error cleanup, assertions fail because calls are neither marked complete nor released properly. This can cause unexpected behavior or crashes when userspace attempts to preallocate calls with call IDs that are already in use.


How can this vulnerability impact me? :

This vulnerability can lead to kernel instability or crashes when userspace applications using AF_RXRPC attempt to preallocate calls with call IDs that are already in use. This may disrupt services relying on rxrpc communication, potentially causing denial of service or unexpected behavior in affected systems.


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