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RefluXFS (CVE-2026-64600): Kritisk Linux-sårbarhed giver lokale brugere root-adgang via XFS-filsystemet

RefluXFS (CVE 2026 64600) er en alvorlig sårbarhed i Linux kernens XFS filsystem, offentliggjort af Qualys Threat Research Unit den 22. Sårbarheden tillader en lokal bruger uden særlige rettigheder at få root adgang ved at udnytte en race condition i XFS' copy on write mekanisme [2][4][9].

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RefluXFS (CVE-2026-64600) er en alvorlig lokal rettighedsforøgelse i Linux-kernens XFS-filsystem, offentliggjort af Qualys Threat Research Unit den 22. juli 2026 . Sårbarheden gør det muligt for en lokal bruger uden særlige rettigheder at opnå root-adgang ved at udnytte en race condition i XFS' copy-on-write-mekanisme .

Hvordan virker det?

Sårbarheden er en race condition i kernel-funktionerne xfs_reflink_fill_cow_hole og xfs_reflink_fill_delalloc . Disse funktioner skifter XFS-inode-låsen (ILOCK) for at hente en transaktion, hvilket gør både datafork- og CoW-fork-mappingerne forældede .

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RefluXFS (CVE-2026-64600): Kritisk Linux-sårbarhed giver lokale brugere root-adgang via XFS-filsystemet

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