CVE-2026-72377

CVE CVE-2026-72377EUVD EUVD-2026-59276Published 2026-08-15T05:56:11.000ZLast changed 2026-08-17T05:13:29.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: afs: Remove setting of AS_RELEASE_ALWAYS for symlinks and mountpoints Regular AFS files correctly use afs_file_aops which have release_folio set as netfs_release_folio, so AS_RELEASE_ALWAYS is valid for them when fscache is enabled (set via afs_vnode_set_cache()). Symlinks and mountpoints in AFS use afs_dir_aops, which does not provide a release_folio callback. However, afs_apply_status() unconditionally calls mapping_set_release_always() for these. In such case when memory management code attempts to release folios, filemap_release_folio() checks folio_needs_release() which returns true due to AS_RELEASE_ALWAYS being set. Since there is no release_folio callback, it falls through to try_to_free_buffers(), which at present expects buffer_heads to be not null. For symlinks and mountpoints without buffer_heads, this causes pointer dereference. [dh: Added more bits that were missed]

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 eae9e78951bb02a7b94a9adef6e981413d13c564 <81e985b4c3a6cbcc443fcdcd3ebda7fcc845d459; patch: 0; 6.14; patch: 7.1.5; eae9e78951bb02a7b94a9adef6e981413d13c564 <9d6b0f6d437e2f8350e08678e5e1d20c11c364f3; patch: 7.2

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Carried in the product catalogue

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Linux — Linux

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