CVE-2026-23118

/// Technical description

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

rxrpc: Fix data-race warning and potential load/store tearing

Fix the following:

BUG: KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet

which is reporting an issue with the reads and writes to ->last_tx_at in:

conn->peer->last_tx_at = ktime_get_seconds();

and:

keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;

The lockless accesses to these to values aren't actually a problem as the

read only needs an approximate time of last transmission for the purposes

of deciding whether or not the transmission of a keepalive packet is

warranted yet.

Also, as ->last_tx_at is a 64-bit value, tearing can occur on a 32-bit

arch.

Fix both of these by switching to an unsigned int for ->last_tx_at and only

storing the LSW of the time64_t. It can then be reconstructed at need

provided no more than 68 years has elapsed since the last transmission.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References