SHANGHAI, Oct 17 (Reuters) - Chinese stocks climbed on Tuesday after dozens of Chinese companies announced plans to buy back shares to boost investor confidence, while a rebound in global shares helped sentiment.

** The blue-chip CSI 300 Index closed up 0.4% and the Shanghai Composite Index rose 0.3%. Hong Kong's Hang Seng Index advanced 0.8%.

** Other Asian stocks also rose in cautious trade, with investors choosing to focus on corporate earnings prospects and the resilience of the U.S. economy amid tensions in the Middle East.

** Dozens of China-listed companies announced plans on late Monday to buy back shares or scrap plans of stock selling, following a slew of measures the authorities took to boost a flagging stock market.

** China's third-quarter gross domestic product (GDP) data, due on Wednesday, is expected to show growth slowing as demand at home and abroad faltered, according to a Reuters poll.

** "China's economy has shown signs of stabilization... However, these signs might be due to base effects, price factors or sample bias," said Ting Lu, chief China economist at Nomura.

** "The bottom-out of China's stock market eventually depends on real improvement of economic data," said Vanho Securities in a note.

** Shares in securities brokers, semiconductors and new energy companies rose.

** But stocks in real estate fell, as traders keep a wary eye on whether Country Garden will default on its offshore debt as a repayment deadline looms. (Reporting by Shanghai Newsroom; Editing by Varun H K and Sohini Goswami)