(Adds Jan. 3 statement)
Jan 11 (Reuters) - Advanced Micro Devices Inc said on Thursday its microprocessors are susceptible to both variants of the Spectre security flaw.
"While we believe that AMD's processor architectures make it difficult to exploit Variant 2, we continue to work closely with the industry on this threat," Chief Technology Officer Mark Papermaster wrote in a blog post. (http://bit.ly/2mlelIr)
On Jan. 3, AMD said in a statement its chips were not affected by the so-called Meltdown flaw that affected Intel Corp chips.
It said then that its chips were vulnerable to one variant of the Spectre bug, but there was "near zero risk" from the second Spectre variant and vulnerability to the second variant "has not been demonstrated on AMD processors to date."
In Thursday's statement, however, AMD said the second Spectre variant "is applicable to AMD" processors and that it would issue patches for its Ryzen and EPYC processors starting this week and older chips in the coming weeks.
AMD's shares have gained nearly 20 percent since the flaws were made public on Jan. 3 as investors speculated that it could wrest market share from Intel, which is most exposed to the flaws. (Reporting by Supantha Mukherjee in Bengaluru; Editing by Maju Samuel and Susan Thomas)