Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.
References8
- git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573
- git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901
- git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33
- git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d
- git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559
- git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a
- git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17
- git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 35 · as of 11 November 2026
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