CVE-2026-80899

CVE CVE-2026-80899EUVD EUVD-2026-71649Published 2026-09-04T17:11:14.000ZLast changed 2026-09-07T14:21:26.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: erofs: remove fscache backend entirely EROFS over fscache was introduced to provide image lazy pulling functionality. After the feature landed, the fscache subsystem made netfs a new hard dependency, which is unexpected for a local filesystem and has an kernel-defined caching hierarchy which could be inflexible compared to the fanotify pre-content hooks. Therefore, this feature has been deprecated for almost two years. As EROFS file-backed mounts and fanotify pre-content hooks both upstream for a while and already providing equivalent functionality (erofs-utils has supported fanotify pre-content hooks), let's remove the fscache backend now. The main application of this feature is Nydus [1], and they plan to move to use fanotify pre-content hooks in the near future too. I hope this patch can be merged into Linux 7.2, which is also motivated by newly found implementation issues [2][3] that are not worth investigating given the deprecation and limited development resources. The associated fscache/cachefiles cleanup patch will follow separately through the vfs tree (netfs) later: it seems fine since the codebase is isolated by CONFIG_CACHEFILES_ONDEMAND. [1] https://github.com/dragonflyoss/nydus/blob/v2.1.0/docs/nydus-fscache.md [2] https://github.com/dragonflyoss/nydus/pull/1824 [3] https://lore.kernel.org/r/20260619135800.1594811-1-michael.bommarito@gmail.com

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 6.9; patch: 7.1.8; patch: 7.2; a1bafc3109d713ed83f73d61ba5cb1e6fd80fdbc <c37460cd9b2fcb61ec66b7eb4fde737e65ec2a56; a1bafc3109d713ed83f73d61ba5cb1e6fd80fdbc <f6145794f17a27d25f8a84edb80731fb0e07c196; patch: 0

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Carried in the product catalogue

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Linux — Linux

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