{"id":"CVE-2026-72377","summary":"afs: Remove setting of AS_RELEASE_ALWAYS for symlinks and mountpoints","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Remove setting of AS_RELEASE_ALWAYS for symlinks and mountpoints\n\nRegular AFS files correctly use afs_file_aops which have release_folio\nset as netfs_release_folio, so AS_RELEASE_ALWAYS is valid for them\nwhen fscache is enabled (set via afs_vnode_set_cache()).\nSymlinks and mountpoints in AFS use afs_dir_aops, which does not provide\na release_folio callback. However, afs_apply_status() unconditionally\ncalls mapping_set_release_always() for these.\n\nIn such case when memory management code attempts to release folios,\nfilemap_release_folio() checks folio_needs_release() which\nreturns true due to AS_RELEASE_ALWAYS being set. Since there is no\nrelease_folio callback, it falls through to try_to_free_buffers(),\nwhich at present expects buffer_heads to be not null. For symlinks\nand mountpoints without buffer_heads, this causes pointer dereference.\n\n[dh: Added more bits that were missed]","modified":"2026-08-18T03:31:14.473400063Z","published":"2026-08-15T05:56:11.017Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72377.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/81e985b4c3a6cbcc443fcdcd3ebda7fcc845d459"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d6b0f6d437e2f8350e08678e5e1d20c11c364f3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72377.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72377"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"eae9e78951bb02a7b94a9adef6e981413d13c564"},{"fixed":"9d6b0f6d437e2f8350e08678e5e1d20c11c364f3"},{"fixed":"81e985b4c3a6cbcc443fcdcd3ebda7fcc845d459"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72377.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72377.json"}}],"schema_version":"1.9.0"}