CVE-2026-74436 - rxrpc: serialize kernel accept preallocation with socket teardown

CVE-2026-74436 - rxrpc: serialize kernel accept preallocation with socket teardown

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/15/2026 - 10:26
CVE ID :CVE-2026-74436
Published : Aug. 15, 2026, 6:22 a.m. | 1 hour, 6 minutes ago
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.
Severity: 0.0 | NA
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