The 66-year-old, who played Nurse Gladys Emanuel in the BBC comedy, has already returned to filming as Jane Beale's (Laurie Brett) and Christian Clarke's (John Partridge) mother for a storyline which will reveal more about the family's history.
A source told Inside Soap: "We're very excited to have Lynda back with us. The last time Linda was around, in late 2006, we found out that Jane used to be called Lesley and had a darker past than anyone realised."
They added: "More skeletons may be unearthed this time, and the dynamic between Linda and Christian should be interesting, too."
Her return to Albert Square will appear on screen in late October or early November.