{"id":"DEBIAN-CVE-2024-53052","details":"In the Linux kernel, the following vulnerability has been resolved:  io_uring/rw: fix missing NOWAIT check for O_DIRECT start write  When io_uring starts a write, it'll call kiocb_start_write() to bump the super block rwsem, preventing any freezes from happening while that write is in-flight. The freeze side will grab that rwsem for writing, excluding any new writers from happening and waiting for existing writes to finish. But io_uring unconditionally uses kiocb_start_write(), which will block if someone is currently attempting to freeze the mount point. This causes a deadlock where freeze is waiting for previous writes to complete, but the previous writes cannot complete, as the task that is supposed to complete them is blocked waiting on starting a new write. This results in the following stuck trace showing that dependency with the write blocked starting a new write:  task:fio             state:D stack:0     pid:886   tgid:886   ppid:876 Call trace:  __switch_to+0x1d8/0x348  __schedule+0x8e8/0x2248  schedule+0x110/0x3f0  percpu_rwsem_wait+0x1e8/0x3f8  __percpu_down_read+0xe8/0x500  io_write+0xbb8/0xff8  io_issue_sqe+0x10c/0x1020  io_submit_sqes+0x614/0x2110  __arm64_sys_io_uring_enter+0x524/0x1038  invoke_syscall+0x74/0x268  el0_svc_common.constprop.0+0x160/0x238  do_el0_svc+0x44/0x60  el0_svc+0x44/0xb0  el0t_64_sync_handler+0x118/0x128  el0t_64_sync+0x168/0x170 INFO: task fsfreeze:7364 blocked for more than 15 seconds.       Not tainted 6.12.0-rc5-00063-g76aaf945701c #7963  with the attempting freezer stuck trying to grab the rwsem:  task:fsfreeze        state:D stack:0     pid:7364  tgid:7364  ppid:995 Call trace:  __switch_to+0x1d8/0x348  __schedule+0x8e8/0x2248  schedule+0x110/0x3f0  percpu_down_write+0x2b0/0x680  freeze_super+0x248/0x8a8  do_vfs_ioctl+0x149c/0x1b18  __arm64_sys_ioctl+0xd0/0x1a0  invoke_syscall+0x74/0x268  el0_svc_common.constprop.0+0x160/0x238  do_el0_svc+0x44/0x60  el0_svc+0x44/0xb0  el0t_64_sync_handler+0x118/0x128  el0t_64_sync+0x168/0x170  Fix this by having the io_uring side honor IOCB_NOWAIT, and only attempt a blocking grab of the super block rwsem if it isn't set. For normal issue where IOCB_NOWAIT would always be set, this returns -EAGAIN which will have io_uring core issue a blocking attempt of the write. That will in turn also get completions run, ensuring forward progress.  Since freezing requires CAP_SYS_ADMIN in the first place, this isn't something that can be triggered by a regular user.","modified":"2026-09-15T09:03:15.938168339Z","published":"2024-11-19T18:15:25.363Z","upstream":["CVE-2024-53052"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-53052"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.119-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53052.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53052.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53052.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}