CVE-2026-74436

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 0337cdba0c477f176c0459bed012109453184573affected
LinuxLinux00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5affected
LinuxLinux00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 35a967ff8b24db09ee429c39c5b5e6571639997daffected
LinuxLinux00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 1741378a7a83dfd8e53a9196730df709b903cd33affected
LinuxLinux00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dc175389b18c29a5303ee83169ec653adfae3e17affected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References