CVE-2026-74435

Summary

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc

rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero.

In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference.

To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL.

This issue was identified with assistance of a private sashiko instance.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa05bf6d9e621fa71e89ccebe3047ba45218d7b38 < 8bbede0afced346b24e4fbde0c68cf12980ba948affected
LinuxLinuxb94a6ccbaf1104dd980150a65fdeb2f69d17d2f5 < 6563b4eb38c35d75892445bcf8aacdc29914821caffected
LinuxLinux46cb765e2e5ad52303ea157e10d370bb6b7acbbf < d3b642cf95d48234590cc91450d8705a9bf6b540affected
LinuxLinuxd2bc90cf6c75cb96d2ce549be6c35efa3099d25b < a962bc8508592c4d51092edac68579bd8b18fe44affected
LinuxLinuxd2bc90cf6c75cb96d2ce549be6c35efa3099d25b < 16c8ae9735c5bd7e54dd7478d6348e0fc860842daffected
LinuxLinuxc580087743712112778a06d65a4074053072d7bfaffected
LinuxLinux6.6.143 < 6.6.145affected
LinuxLinux6.12.93 < 6.12.97affected
LinuxLinux6.18.35 < 6.18.40affected
LinuxLinux7.0.11 < 7.1affected
LinuxLinux7.1affected
LinuxLinux0 < 7.1unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References