CVE-2026-23118

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a426f29ac3fa3465093567ab763ada46762fb57c
• https://git.kernel.org/stable/c/c08cf314191cd0f8699089715efb9eff030f0086
• https://git.kernel.org/stable/c/f8cf1368e0a5491b27189a695c36f64e48f3d19d
• https://git.kernel.org/stable/c/5d5fe8bcd331f1e34e0943ec7c18432edfcf0e8b

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