CVE-2026-53024

published 2026-06-24

CVE-2026-53024: In the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free if write is called after disconnect If a user writes to…

Priority P3 40 high 7.8 CVSS 3.1

AV L AC L PR L UI N S U C H I H A H

In the Linux kernel, the following vulnerability has been resolved:

greybus: raw: fix use-after-free if write is called after disconnect

If a user writes to the chardev after disconnect has been called, the
kernel panics with the following trace (with
CONFIG_INIT_ON_FREE_DEFAULT_ON=y):

BUG: kernel NULL pointer dereference, address: 0000000000000218
...
Call Trace:

gb_operation_create_common+0x61/0x180
gb_operation_create_flags+0x28/0xa0
gb_operation_sync_timeout+0x6f/0x100
raw_write+0x7b/0xc7 [gb_raw]
vfs_write+0xcf/0x420
? task_mm_cid_work+0x136/0x220
ksys_write+0x63/0xe0
do_syscall_64+0xa4/0x290
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Disconnect calls gb_connection_destroy, which ends up freeing the
connection object. When gb_operation_sync is called in the write file
operations, its gets a freed connection as parameter and the kernel
panics.

The gb_connection_destroy cannot be moved out of the disconnect
function, as the Greybus subsystem expect all connections belonging to a
bundle to be destroyed when disconnect returns.

To prevent this bug, use a rw lock to synchronize access between write
and disconnect. This guarantees that the write function doesn't try
to use a disconnected connection.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
linux	linux	—	—
linux	linux	>= e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 < 48d6c32bc049abd114e8f0836c0e7d7cbfba7827	48d6c32bc049abd114e8f0836c0e7d7cbfba7827
linux	linux	>= e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 < 84265cbd96b97058ef67e3f8be3933667a000835	84265cbd96b97058ef67e3f8be3933667a000835

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-825