{"id":"DEBIAN-CVE-2022-49706","details":"In the Linux kernel, the following vulnerability has been resolved:  zonefs: fix zonefs_iomap_begin() for reads  If a readahead is issued to a sequential zone file with an offset exactly equal to the current file size, the iomap type is set to IOMAP_UNWRITTEN, which will prevent an IO, but the iomap length is calculated as 0. This causes a WARN_ON() in iomap_iter():  [17309.548939] WARNING: CPU: 3 PID: 2137 at fs/iomap/iter.c:34 iomap_iter+0x9cf/0xe80 [...] [17309.650907] RIP: 0010:iomap_iter+0x9cf/0xe80 [...] [17309.754560] Call Trace: [17309.757078]  \u003cTASK\u003e [17309.759240]  ? lock_is_held_type+0xd8/0x130 [17309.763531]  iomap_readahead+0x1a8/0x870 [17309.767550]  ? iomap_read_folio+0x4c0/0x4c0 [17309.771817]  ? lockdep_hardirqs_on_prepare+0x400/0x400 [17309.778848]  ? lock_release+0x370/0x750 [17309.784462]  ? folio_add_lru+0x217/0x3f0 [17309.790220]  ? reacquire_held_locks+0x4e0/0x4e0 [17309.796543]  read_pages+0x17d/0xb60 [17309.801854]  ? folio_add_lru+0x238/0x3f0 [17309.807573]  ? readahead_expand+0x5f0/0x5f0 [17309.813554]  ? policy_node+0xb5/0x140 [17309.819018]  page_cache_ra_unbounded+0x27d/0x450 [17309.825439]  filemap_get_pages+0x500/0x1450 [17309.831444]  ? filemap_add_folio+0x140/0x140 [17309.837519]  ? lock_is_held_type+0xd8/0x130 [17309.843509]  filemap_read+0x28c/0x9f0 [17309.848953]  ? zonefs_file_read_iter+0x1ea/0x4d0 [zonefs] [17309.856162]  ? trace_contention_end+0xd6/0x130 [17309.862416]  ? __mutex_lock+0x221/0x1480 [17309.868151]  ? zonefs_file_read_iter+0x166/0x4d0 [zonefs] [17309.875364]  ? filemap_get_pages+0x1450/0x1450 [17309.881647]  ? __mutex_unlock_slowpath+0x15e/0x620 [17309.888248]  ? wait_for_completion_io_timeout+0x20/0x20 [17309.895231]  ? lock_is_held_type+0xd8/0x130 [17309.901115]  ? lock_is_held_type+0xd8/0x130 [17309.906934]  zonefs_file_read_iter+0x356/0x4d0 [zonefs] [17309.913750]  new_sync_read+0x2d8/0x520 [17309.919035]  ? __x64_sys_lseek+0x1d0/0x1d0  Furthermore, this causes iomap_readahead() to loop forever as iomap_readahead_iter() always returns 0, making no progress.  Fix this by treating reads after the file size as access to holes, setting the iomap type to IOMAP_HOLE, the iomap addr to IOMAP_NULL_ADDR and using the length argument as is for the iomap length. To simplify the code with this change, zonefs_iomap_begin() is split into the read variant, zonefs_read_iomap_begin() and zonefs_read_iomap_ops, and the write variant, zonefs_write_iomap_begin() and zonefs_write_iomap_ops.","modified":"2026-09-01T20:04:56.083521013Z","published":"2025-02-26T07:01:46.403Z","upstream":["CVE-2022-49706"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49706"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49706.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49706.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49706.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}