What is known as "coram nobis" in the context of federal criminal proceedings?

"Coram nobis is an extraordinary writ that usually is available only to petitioners who have fully served their sentences" and may issue under the All Writs Act, 28 U.S.C. 1651(a). United States v. Monreal, 301 F.3d 1127, 1131-32 (9th Cir. 2002). The writ may be issued by a federal court only with respect to a federal criminal sentence. See Yasui v. United States, 772 F.2d 1496, 1498 (9th Cir. 1985) ("The writ of error coram nobis fills a void in the availability of

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post-conviction remedies in federal criminal cases."); Hensley v. Municipal Court, 453 F.2d 1252, 1252 n. 2 (9th Cir. 1972) (holding that, even though habeas jurisdiction was lacking, a petition could not be treated as "one seeking coram nobis because [petitioner] seeks to challenge a state court proceeding in federal court" and "[c]oram nobis lies only to challenge errors occurring in the same court"), rev'd on other grounds by 411 U.S. 345 (1973).