Description

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 ...

Classification

CVE ID: CVE-2024-53052

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 5.16% (scored less or equal to compared to others)

EPSS Date: 2025-04-04 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2024-53052
https://git.kernel.org/stable/c/485d9232112b17f389b29497ff41b97b3189546b
https://git.kernel.org/stable/c/4e24041ba86d50aaa4c792ae2c88ed01b3d96243
https://git.kernel.org/stable/c/9e8debb8e51354b201db494689198078ec2c1e75
https://git.kernel.org/stable/c/003d2996964c03dfd34860500428f4cdf1f5879e
https://git.kernel.org/stable/c/26b8c48f369b7591f5679e0b90612f4862a32929
https://git.kernel.org/stable/c/1d60d74e852647255bd8e76f5a22dc42531e4389

Timeline