The Yosemite and Sequoia/Kings Canyon websites have both posted updated fire restriction information just recently, and their guidance on stoves is much clearer than before. Alcohol and ESBIT are now explicitly allowed.
Fire restrictions are in effect; below 6,000 feet, fires are only permitted in portable stoves using pressurized gas, liquid fuel, propane, or alcohol (including tablet/cube stoves). Wood fires (including twig stove fires) and charcoal fires are prohibited. Smoking is not allowed below 6,000 feet in the wilderness.
Wood and charcoal fires (including wood-burning stoves) are prohibited below 6,000 feet. Year-round elevation/site-specific wilderness fire restrictions also apply. Refer to the Minimum Impact Restrictions.
Gas, propane, alcohol (with and without a shutoff valve) and tablet/cube stoves are permitted.
The SEKI link specifies that the current restrictions are for “high” fire danger, but even at “extreme” levels the stove restriction remains the same except that wood stoves are prohibited at all elevations.
Hat tip to the JMT Yahoo group for pointing this out.

