Europe stocks slide; Dubai worry hits banks, autos

* FTSEurofirst 300 down 2.1 percent

* Banks, LSE, autos hit by Dubai concerns

* Commodity stocks hit by falling crude, metal prices

* U.S. markets closed for Thanksgiving holiday

LONDON, Nov 26 (Reuters) - Debt problems in Dubai sent banks and auto stocks sliding, contributing to a 2.1 percent fall in European shares on Thursday, with energy and mining stocks hurt by lower commodity prices.

By 0945 GMT, the FTSEurofirst 300 .FTEU3 was down 22.74 points at 999.21 after it rose 0.5 percent in the previous session.

Banks were the biggest drag on the index as concerns on the health of the global financial system resurfaced as Dubai said two of its flagship firms planned to delay repayment on billions of dollars of debt. [ID:nGEE5AO2L1]

Barclays (BARC.L), HSBC (HSBA.L), BNP Paribas (BNPP.PA) and Deutsche Bank (DBKGn.DE) fell between 3.7 and 5.3 percent.

"Certainly the Dubai debt debacle and the uncertainty that it has created as a results of the Kingdom's forthcoming holiday has had a severe knock on effect on European equity markets, as well as throwing the bond market in to turmoil," said David Buik, senior partner at BGC Partners.

London Stock Exchange (LSE.L) fell 4 percent as traders cited concern that Bourse Dubai held a substantial stake in the company.

Porsche (PSHG_p.DE) fell 7 percent, as traders pointed to worries that Qatar Investment Authority may cut its 10 percent stake in the carmaker to boost liquidity after the Dubai government asked for a debt standstill on two of its firms.

Shares in luxury auto peer Daimler (DAIGn.DE) fell 4.7 percent. Aabar Investments from Abu Dhabi owns a 9.1 percent stake in the company and Kuwait owns a 6.9 percent stake. The DJ Stoxx auto index .SXAP was down 3.8 percent.

Prices of base metal and crude CLc1 were weaker, hurting mining stocks and energy majors.

Rio Tinto (RIO.L), Xstrata (XTA.L), Lonmin (LMI.L), Anglo American (AAL.L), Kazakhmys (KAZ.L) and Fresnillo (FRES.L) were down 0.5 and 3.6 percent, while BP (BP.L) and Shell (RDSa.L) lost 0.5 and 1.1 percent respectively.

U.S. markets are closed on Thursday for Thanksgiving Day.

France's CAC .FCHI, Germany's DAX .GDAXI and Britain's FTSE 100 .FTSE were off between 1.8 and 2.2 percent. (Reporting by Simon Falush; Editing by Mike Nesbit) ((simon.falush@reuters.com. +44 20 7542 7681) Reuters Messaging: simon.falush.reuters.com@reuters.net))