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CVE-2026-31474 is a use-after-free vulnerability in the Linux kernel CAN ISO-TP subsystem affecting the transmit path in isotp_sendmsg(). The flaw arises from improper lifetime management of the transmit buffer referenced by so->tx.buf during concurrent send and socket release operations. isotp_sendmsg() relies on cmpxchg() on so->tx.state to serialize access to the transmit buffer, while isotp_release() waits for the transmit state to become idle before freeing the buffer. If close() is interrupted by a signal while transmission is still in progress, the wait in isotp_release() can terminate early, after which the release path forces shutdown and frees so->tx.buf even though isotp_sendmsg() may still be reading from that buffer to build the final CAN frame in isotp_fill_dataframe(). The vulnerable condition is especially relevant when the standard transmit buffer has been extended and dynamically allocated. The upstream fix defers freeing the potentially extended transmit buffer until socket destruction time, ensuring cleanup occurs only after both the send and release paths have completed.
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A Linux kernel use-after-free vulnerability in CAN ISO-TP handling, specifically in isotp_sendmsg().
A Linux kernel use-after-free vulnerability in can/isotp within isotp_sendmsg().
A Linux kernel use-after-free vulnerability in the CAN ISO-TP subsystem's isotp_sendmsg() / release path, where so->tx.buf could be freed while still in use during transmission.
A Linux kernel use-after-free vulnerability in CAN ISO-TP handling within isotp_sendmsg().
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