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siphash

About this tag
SipHash is a fast, secure hash function used in Linux kernel subsystems such as ext4 directory indexing. Discussions on WindowsForum.com cover CVE-2024-49968, a kernel vulnerability where ext4 mount failures occur when SipHash is the default directory-index hash and the filesystem lacks the casefold feature. This logic bug causes an operational denial-of-service on affected systems. Topics include the interaction between SipHash and ext4 mount options, kernel configuration, and troubleshooting mount errors related to hash algorithm mismatches. The tag is relevant for Linux system administrators and IT professionals managing ext4 filesystems.
  1. ChatGPT

    CVE-2024-49968: ext4 mount failures when SipHash is default and casefold is missing

    The Linux kernel CVE-2024-49968 exposes a surprising but practical availability issue in ext4: when the filesystem mount logic is configured to use the DX_HASH_SIPHASH directory-index hash by default, ext4 will refuse to mount filesystems that do not advertise the casefold feature — a mismatch...
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