An nameless reader quotes a report from Ars Technica: At this level, best on-line multiplayer video games on the PC include some sort of kernel-level anti-cheat software program. As we have written earlier than, that is software program that runs with extra elevated privileges than most different apps and video games you run in your PC, permitting it to load in earlier and detect superior strategies of dishonest. Extra just lately, anti-cheat software program has began to require extra Home windows safety features like Safe Boot, a TPM 2.0 module, and virtualization-based reminiscence integrity safety. Riot Video games, finest identified for titles like Valorant and League of Legends and the Vanguard anti-cheat software program, has usually been one of many earliest to implement new anti-cheat necessities. There’s already an extended checklist of checks that programs have to clear earlier than they’re going to be allowed to play Riot’s video games on-line, and now the studio is asserting a brand new one: a BIOS replace requirement that shall be imposed on “sure gamers” following Riot’s discovery of a UEFI bug that would enable particularly devoted and motivated cheaters to bypass sure reminiscence protections.
In brief, the bug impacts the input-output reminiscence administration unit (IOMMU) “on some UEFI-based motherboards from a number of distributors.” One characteristic of the IOMMU is to guard system reminiscence from direct entry throughout boot by exterior {hardware} units, which in any other case may manipulate the contents of your PC’s reminiscence in ways in which may allow dishonest. The patch for these safety vulnerabilities (CVE-2025-11901, CVE-202514302, CVE-2025-14303, and CVE-2025-14304) fixes an issue the place this pre-boot direct reminiscence entry (DMA) safety might be disabled even when it was marked as enabled within the BIOS, making a small window through the boot course of the place DMA units may acquire entry to RAM.
The relative obscurity and complexity of this {hardware} exploit signifies that Vanguard is not going to be implementing these BIOS necessities on each single participant of its video games. For now, it’s going to simply apply to “restricted” gamers of Valorant whose programs, for one purpose or one other, are “too just like cheaters who get round safety features with a purpose to change into undetectable to Vanguard.” However Riot says it is contemplating rolling the BIOS requirement out to all gamers in Valorant’s highest aggressive rating tiers (Ascendant, Immortal, and Radiant), the place there’s extra to be gained from working across the anti-cheat software program. And Riot anti-cheat analyst Mohamed Al-Sharifi says the identical restrictions might be turned on for League of Legends, although they don’t seem to be at present. If customers are blocked from enjoying by Vanguard, they’re going to have to obtain and set up the newest BIOS replace for his or her motherboard earlier than they’re going to be allowed to launch the sport. Riot’s new anti-cheat change may create issues for older PCs if the brand new anti-cheat change is expanded, notes Ars.
The replace depends on a BIOS patch to repair a UEFI flaw, and lots of older motherboards, particularly Intel 300-series and AMD AM4 boards, might by no means obtain that replace. If Riot flags a system and the producer does not present a patched BIOS, gamers might be locked out of video games regardless of having in any other case succesful {hardware}.
