Security Vulnerabilities - CVEs Published In May 2025
In the Linux kernel, the following vulnerability has been resolved:
net_sched: qfq: Fix double list add in class with netem as child qdisc
As described in Gerrard's report [1], there are use cases where a netem
child qdisc will make the parent qdisc's enqueue callback reentrant.
In the case of qfq, there won't be a UAF, but the code will add the same
classifier to the list twice, which will cause memory corruption.
This patch checks whether the class was already added to the agg->active
list (cl_is_active) before doing the addition to cater for the reentrant
case.
[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
CVSS Score
7.8
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
net_sched: ets: Fix double list add in class with netem as child qdisc
As described in Gerrard's report [1], there are use cases where a netem
child qdisc will make the parent qdisc's enqueue callback reentrant.
In the case of ets, there won't be a UAF, but the code will add the same
classifier to the list twice, which will cause memory corruption.
In addition to checking for qlen being zero, this patch checks whether
the class was already added to the active_list (cl_is_active) before
doing the addition to cater for the reentrant case.
[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
CVSS Score
7.8
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
wifi: plfxlc: Remove erroneous assert in plfxlc_mac_release
plfxlc_mac_release() asserts that mac->lock is held. This assertion is
incorrect, because even if it was possible, it would not be the valid
behaviour. The function is used when probe fails or after the device is
disconnected. In both cases mac->lock can not be held as the driver is
not working with the device at the moment. All functions that use mac->lock
unlock it just after it was held. There is also no need to hold mac->lock
for plfxlc_mac_release() itself, as mac data is not affected, except for
mac->flags, which is modified atomically.
This bug leads to the following warning:
================================================================
WARNING: CPU: 0 PID: 127 at drivers/net/wireless/purelifi/plfxlc/mac.c:106 plfxlc_mac_release+0x7d/0xa0
Modules linked in:
CPU: 0 PID: 127 Comm: kworker/0:2 Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: usb_hub_wq hub_event
RIP: 0010:plfxlc_mac_release+0x7d/0xa0 drivers/net/wireless/purelifi/plfxlc/mac.c:106
Call Trace:
<TASK>
probe+0x941/0xbd0 drivers/net/wireless/purelifi/plfxlc/usb.c:694
usb_probe_interface+0x5c0/0xaf0 drivers/usb/core/driver.c:396
really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
__driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
driver_probe_device+0x50/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429
__device_attach+0x359/0x570 drivers/base/dd.c:1015
bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489
device_add+0xb48/0xfd0 drivers/base/core.c:3696
usb_set_configuration+0x19dd/0x2020 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238
usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293
really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
__driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
driver_probe_device+0x50/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429
__device_attach+0x359/0x570 drivers/base/dd.c:1015
bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489
device_add+0xb48/0xfd0 drivers/base/core.c:3696
usb_new_device+0xbdd/0x18f0 drivers/usb/core/hub.c:2620
hub_port_connect drivers/usb/core/hub.c:5477 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5617 [inline]
port_event drivers/usb/core/hub.c:5773 [inline]
hub_event+0x2efe/0x5730 drivers/usb/core/hub.c:5855
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
================================================================
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
CVSS Score
5.5
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
powerpc64/ftrace: fix module loading without patchable function entries
get_stubs_size assumes that there must always be at least one patchable
function entry, which is not always the case (modules that export data
but no code), otherwise it returns -ENOEXEC and thus the section header
sh_size is set to that value. During module_memory_alloc() the size is
passed to execmem_alloc() after being page-aligned and thus set to zero
which will cause it to fail the allocation (and thus module loading) as
__vmalloc_node_range() checks for zero-sized allocs and returns null:
[ 115.466896] module_64: cast_common: doesn't contain __patchable_function_entries.
[ 115.469189] ------------[ cut here ]------------
[ 115.469496] WARNING: CPU: 0 PID: 274 at mm/vmalloc.c:3778 __vmalloc_node_range_noprof+0x8b4/0x8f0
...
[ 115.478574] ---[ end trace 0000000000000000 ]---
[ 115.479545] execmem: unable to allocate memory
Fix this by removing the check completely, since it is anyway not
helpful to propagate this as an error upwards.
CVSS Score
5.5
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix use-after-free in session logoff
The sess->user object can currently be in use by another thread, for
example if another connection has sent a session setup request to
bind to the session being free'd. The handler for that connection could
be in the smb2_sess_setup function which makes use of sess->user.
CVSS Score
7.8
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
iommu: Fix two issues in iommu_copy_struct_from_user()
In the review for iommu_copy_struct_to_user() helper, Matt pointed out that
a NULL pointer should be rejected prior to dereferencing it:
https://lore.kernel.org/all/86881827-8E2D-461C-BDA3-FA8FD14C343C@nvidia.com
And Alok pointed out a typo at the same time:
https://lore.kernel.org/all/480536af-6830-43ce-a327-adbd13dc3f1d@oracle.com
Since both issues were copied from iommu_copy_struct_from_user(), fix them
first in the current header.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
irqchip/qcom-mpm: Prevent crash when trying to handle non-wake GPIOs
On Qualcomm chipsets not all GPIOs are wakeup capable. Those GPIOs do not
have a corresponding MPM pin and should not be handled inside the MPM
driver. The IRQ domain hierarchy is always applied, so it's required to
explicitly disconnect the hierarchy for those. The pinctrl-msm driver marks
these with GPIO_NO_WAKE_IRQ. qcom-pdc has a check for this, but
irq-qcom-mpm is currently missing the check. This is causing crashes when
setting up interrupts for non-wake GPIOs:
root@rb1:~# gpiomon -c gpiochip1 10
irq: IRQ159: trimming hierarchy from :soc@0:interrupt-controller@f200000-1
Unable to handle kernel paging request at virtual address ffff8000a1dc3820
Hardware name: Qualcomm Technologies, Inc. Robotics RB1 (DT)
pc : mpm_set_type+0x80/0xcc
lr : mpm_set_type+0x5c/0xcc
Call trace:
mpm_set_type+0x80/0xcc (P)
qcom_mpm_set_type+0x64/0x158
irq_chip_set_type_parent+0x20/0x38
msm_gpio_irq_set_type+0x50/0x530
__irq_set_trigger+0x60/0x184
__setup_irq+0x304/0x6bc
request_threaded_irq+0xc8/0x19c
edge_detector_setup+0x260/0x364
linereq_create+0x420/0x5a8
gpio_ioctl+0x2d4/0x6c0
Fix this by copying the check for GPIO_NO_WAKE_IRQ from qcom-pdc.c, so that
MPM is removed entirely from the hierarchy for non-wake GPIOs.
CVSS Score
5.5
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Fix slab-use-after-free in hdcp
The HDCP code in amdgpu_dm_hdcp.c copies pointers to amdgpu_dm_connector
objects without incrementing the kref reference counts. When using a
USB-C dock, and the dock is unplugged, the corresponding
amdgpu_dm_connector objects are freed, creating dangling pointers in the
HDCP code. When the dock is plugged back, the dangling pointers are
dereferenced, resulting in a slab-use-after-free:
[ 66.775837] BUG: KASAN: slab-use-after-free in event_property_validate+0x42f/0x6c0 [amdgpu]
[ 66.776171] Read of size 4 at addr ffff888127804120 by task kworker/0:1/10
[ 66.776179] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.14.0-rc7-00180-g54505f727a38-dirty #233
[ 66.776183] Hardware name: HP HP Pavilion Aero Laptop 13-be0xxx/8916, BIOS F.17 12/18/2024
[ 66.776186] Workqueue: events event_property_validate [amdgpu]
[ 66.776494] Call Trace:
[ 66.776496] <TASK>
[ 66.776497] dump_stack_lvl+0x70/0xa0
[ 66.776504] print_report+0x175/0x555
[ 66.776507] ? __virt_addr_valid+0x243/0x450
[ 66.776510] ? kasan_complete_mode_report_info+0x66/0x1c0
[ 66.776515] kasan_report+0xeb/0x1c0
[ 66.776518] ? event_property_validate+0x42f/0x6c0 [amdgpu]
[ 66.776819] ? event_property_validate+0x42f/0x6c0 [amdgpu]
[ 66.777121] __asan_report_load4_noabort+0x14/0x20
[ 66.777124] event_property_validate+0x42f/0x6c0 [amdgpu]
[ 66.777342] ? __lock_acquire+0x6b40/0x6b40
[ 66.777347] ? enable_assr+0x250/0x250 [amdgpu]
[ 66.777571] process_one_work+0x86b/0x1510
[ 66.777575] ? pwq_dec_nr_in_flight+0xcf0/0xcf0
[ 66.777578] ? assign_work+0x16b/0x280
[ 66.777580] ? lock_is_held_type+0xa3/0x130
[ 66.777583] worker_thread+0x5c0/0xfa0
[ 66.777587] ? process_one_work+0x1510/0x1510
[ 66.777588] kthread+0x3a2/0x840
[ 66.777591] ? kthread_is_per_cpu+0xd0/0xd0
[ 66.777594] ? trace_hardirqs_on+0x4f/0x60
[ 66.777597] ? _raw_spin_unlock_irq+0x27/0x60
[ 66.777599] ? calculate_sigpending+0x77/0xa0
[ 66.777602] ? kthread_is_per_cpu+0xd0/0xd0
[ 66.777605] ret_from_fork+0x40/0x90
[ 66.777607] ? kthread_is_per_cpu+0xd0/0xd0
[ 66.777609] ret_from_fork_asm+0x11/0x20
[ 66.777614] </TASK>
[ 66.777643] Allocated by task 10:
[ 66.777646] kasan_save_stack+0x39/0x60
[ 66.777649] kasan_save_track+0x14/0x40
[ 66.777652] kasan_save_alloc_info+0x37/0x50
[ 66.777655] __kasan_kmalloc+0xbb/0xc0
[ 66.777658] __kmalloc_cache_noprof+0x1c8/0x4b0
[ 66.777661] dm_dp_add_mst_connector+0xdd/0x5c0 [amdgpu]
[ 66.777880] drm_dp_mst_port_add_connector+0x47e/0x770 [drm_display_helper]
[ 66.777892] drm_dp_send_link_address+0x1554/0x2bf0 [drm_display_helper]
[ 66.777901] drm_dp_check_and_send_link_address+0x187/0x1f0 [drm_display_helper]
[ 66.777909] drm_dp_mst_link_probe_work+0x2b8/0x410 [drm_display_helper]
[ 66.777917] process_one_work+0x86b/0x1510
[ 66.777919] worker_thread+0x5c0/0xfa0
[ 66.777922] kthread+0x3a2/0x840
[ 66.777925] ret_from_fork+0x40/0x90
[ 66.777927] ret_from_fork_asm+0x11/0x20
[ 66.777932] Freed by task 1713:
[ 66.777935] kasan_save_stack+0x39/0x60
[ 66.777938] kasan_save_track+0x14/0x40
[ 66.777940] kasan_save_free_info+0x3b/0x60
[ 66.777944] __kasan_slab_free+0x52/0x70
[ 66.777946] kfree+0x13f/0x4b0
[ 66.777949] dm_dp_mst_connector_destroy+0xfa/0x150 [amdgpu]
[ 66.778179] drm_connector_free+0x7d/0xb0
[ 66.778184] drm_mode_object_put.part.0+0xee/0x160
[ 66.778188] drm_mode_object_put+0x37/0x50
[ 66.778191] drm_atomic_state_default_clear+0x220/0xd60
[ 66.778194] __drm_atomic_state_free+0x16e/0x2a0
[ 66.778197] drm_mode_atomic_ioctl+0x15ed/0x2ba0
[ 66.778200] drm_ioctl_kernel+0x17a/0x310
[ 66.778203] drm_ioctl+0x584/0xd10
[ 66.778206] amdgpu_drm_ioctl+0xd2/0x1c0 [amdgpu]
[ 66.778375] __x64_sys_ioctl+0x139/0x1a0
[ 66.778378] x64_sys_call+0xee7/0xfb0
[ 66.778381]
---truncated---
CVSS Score
7.8
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix the inode leak in btrfs_iget()
[BUG]
There is a bug report that a syzbot reproducer can lead to the following
busy inode at unmount time:
BTRFS info (device loop1): last unmount of filesystem 1680000e-3c1e-4c46-84b6-56bd3909af50
VFS: Busy inodes after unmount of loop1 (btrfs)
------------[ cut here ]------------
kernel BUG at fs/super.c:650!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 48168 Comm: syz-executor Not tainted 6.15.0-rc2-00471-g119009db2674 #2 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:generic_shutdown_super+0x2e9/0x390 fs/super.c:650
Call Trace:
<TASK>
kill_anon_super+0x3a/0x60 fs/super.c:1237
btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2099
deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xe2/0x100 fs/super.c:502
cleanup_mnt+0x21f/0x440 fs/namespace.c:1435
task_work_run+0x14d/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x269/0x290 kernel/entry/common.c:218
do_syscall_64+0xd4/0x250 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
[CAUSE]
When btrfs_alloc_path() failed, btrfs_iget() directly returned without
releasing the inode already allocated by btrfs_iget_locked().
This results the above busy inode and trigger the kernel BUG.
[FIX]
Fix it by calling iget_failed() if btrfs_alloc_path() failed.
If we hit error inside btrfs_read_locked_inode(), it will properly call
iget_failed(), so nothing to worry about.
Although the iget_failed() cleanup inside btrfs_read_locked_inode() is a
break of the normal error handling scheme, let's fix the obvious bug
and backport first, then rework the error handling later.
CVSS Score
5.5
EPSS Score
0.001
Published
2025-05-20
In the Linux kernel, the following vulnerability has been resolved:
firmware: arm_scmi: Balance device refcount when destroying devices
Using device_find_child() to lookup the proper SCMI device to destroy
causes an unbalance in device refcount, since device_find_child() calls an
implicit get_device(): this, in turns, inhibits the call of the provided
release methods upon devices destruction.
As a consequence, one of the structures that is not freed properly upon
destruction is the internal struct device_private dev->p populated by the
drivers subsystem core.
KMemleak detects this situation since loading/unloding some SCMI driver
causes related devices to be created/destroyed without calling any
device_release method.
unreferenced object 0xffff00000f583800 (size 512):
comm "insmod", pid 227, jiffies 4294912190
hex dump (first 32 bytes):
00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
ff ff ff ff ff ff ff ff 60 36 1d 8a 00 80 ff ff ........`6......
backtrace (crc 114e2eed):
kmemleak_alloc+0xbc/0xd8
__kmalloc_cache_noprof+0x2dc/0x398
device_add+0x954/0x12d0
device_register+0x28/0x40
__scmi_device_create.part.0+0x1bc/0x380
scmi_device_create+0x2d0/0x390
scmi_create_protocol_devices+0x74/0xf8
scmi_device_request_notifier+0x1f8/0x2a8
notifier_call_chain+0x110/0x3b0
blocking_notifier_call_chain+0x70/0xb0
scmi_driver_register+0x350/0x7f0
0xffff80000a3b3038
do_one_initcall+0x12c/0x730
do_init_module+0x1dc/0x640
load_module+0x4b20/0x5b70
init_module_from_file+0xec/0x158
$ ./scripts/faddr2line ./vmlinux device_add+0x954/0x12d0
device_add+0x954/0x12d0:
kmalloc_noprof at include/linux/slab.h:901
(inlined by) kzalloc_noprof at include/linux/slab.h:1037
(inlined by) device_private_init at drivers/base/core.c:3510
(inlined by) device_add at drivers/base/core.c:3561
Balance device refcount by issuing a put_device() on devices found via
device_find_child().
CVSS Score
5.5
EPSS Score
0.001
Published
2025-05-20