rxrpc: Fix oops due to non-existence of prealloc backlog struct

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix oops due to non-existence of prealloc backlog struct If an AF_RXRPC service socket is opened and bound, but calls are preallocated, then rxrpc_alloc_incoming_call() will oops because the rxrpc_backlog struct doesn't get allocated until the first preallocation is made. Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no backlog struct. This will cause the incoming call to be aborted.

Timeline

1. Aug 16, 2025, 10:55 AM UTCCVE published
2. Oct 15, 2026, 9:51 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 15, 2026, 9:52 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in bf0ca6a1bc4fb904b598137c6718785a107e3adf; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in f7afb3ff01c42c49e8a143cdce400b95844bb506; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in f5e72b7824d08c206ce106d30cb37c4642900ccc; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in 0eef29385d715d4c7fd707b18d4a9b76c76dd5e6; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in efc1b2b7c1a308b60df8f36bc2d7ce16d3999364; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in d1ff5f9d2c5405681457262e23c720b08977c11f; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in 2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3; From 248f219cb8bcbfbd7f132752d44afa2df7c241d1 · fixed in 880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4

• Linux Linux

  4.9

• KernelLinux

  From 4.9.0 · fixed in 5.4.296; From 5.5.0 · fixed in 5.10.240; From 5.11.0 · fixed in 5.15.189; From 5.16.0 · fixed in 6.1.146; From 6.2.0 · fixed in 6.6.99; From 6.7.0 · fixed in 6.12.39; From 6.13.0 · fixed in 6.15.7

References 8