Linux: >> Linux Kernel >> 5.15.85 Security Vulnerabilities
In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmfmac: Fix potential shift-out-of-bounds in brcmf_fw_alloc_request()
This patch fixes a shift-out-of-bounds in brcmfmac that occurs in
BIT(chiprev) when a 'chiprev' provided by the device is too large.
It should also not be equal to or greater than BITS_PER_TYPE(u32)
as we do bitwise AND with a u32 variable and BIT(chiprev). The patch
adds a check that makes the function return NULL if that is the case.
Note that the NULL case is later handled by the bus-specific caller,
brcmf_usb_probe_cb() or brcmf_usb_reset_resume(), for example.
Found by a modified version of syzkaller.
UBSAN: shift-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
shift exponent 151055786 is too large for 64-bit type 'long unsigned int'
CPU: 0 PID: 1885 Comm: kworker/0:2 Tainted: G O 5.14.0+ #132
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
dump_stack_lvl+0x57/0x7d
ubsan_epilogue+0x5/0x40
__ubsan_handle_shift_out_of_bounds.cold+0x53/0xdb
? lock_chain_count+0x20/0x20
brcmf_fw_alloc_request.cold+0x19/0x3ea
? brcmf_fw_get_firmwares+0x250/0x250
? brcmf_usb_ioctl_resp_wait+0x1a7/0x1f0
brcmf_usb_get_fwname+0x114/0x1a0
? brcmf_usb_reset_resume+0x120/0x120
? number+0x6c4/0x9a0
brcmf_c_process_clm_blob+0x168/0x590
? put_dec+0x90/0x90
? enable_ptr_key_workfn+0x20/0x20
? brcmf_common_pd_remove+0x50/0x50
? rcu_read_lock_sched_held+0xa1/0xd0
brcmf_c_preinit_dcmds+0x673/0xc40
? brcmf_c_set_joinpref_default+0x100/0x100
? rcu_read_lock_sched_held+0xa1/0xd0
? rcu_read_lock_bh_held+0xb0/0xb0
? lock_acquire+0x19d/0x4e0
? find_held_lock+0x2d/0x110
? brcmf_usb_deq+0x1cc/0x260
? mark_held_locks+0x9f/0xe0
? lockdep_hardirqs_on_prepare+0x273/0x3e0
? _raw_spin_unlock_irqrestore+0x47/0x50
? trace_hardirqs_on+0x1c/0x120
? brcmf_usb_deq+0x1a7/0x260
? brcmf_usb_rx_fill_all+0x5a/0xf0
brcmf_attach+0x246/0xd40
? wiphy_new_nm+0x1476/0x1d50
? kmemdup+0x30/0x40
brcmf_usb_probe+0x12de/0x1690
? brcmf_usbdev_qinit.constprop.0+0x470/0x470
usb_probe_interface+0x25f/0x710
really_probe+0x1be/0xa90
__driver_probe_device+0x2ab/0x460
? usb_match_id.part.0+0x88/0xc0
driver_probe_device+0x49/0x120
__device_attach_driver+0x18a/0x250
? driver_allows_async_probing+0x120/0x120
bus_for_each_drv+0x123/0x1a0
? bus_rescan_devices+0x20/0x20
? lockdep_hardirqs_on_prepare+0x273/0x3e0
? trace_hardirqs_on+0x1c/0x120
__device_attach+0x207/0x330
? device_bind_driver+0xb0/0xb0
? kobject_uevent_env+0x230/0x12c0
bus_probe_device+0x1a2/0x260
device_add+0xa61/0x1ce0
? __mutex_unlock_slowpath+0xe7/0x660
? __fw_devlink_link_to_suppliers+0x550/0x550
usb_set_configuration+0x984/0x1770
? kernfs_create_link+0x175/0x230
usb_generic_driver_probe+0x69/0x90
usb_probe_device+0x9c/0x220
really_probe+0x1be/0xa90
__driver_probe_device+0x2ab/0x460
driver_probe_device+0x49/0x120
__device_attach_driver+0x18a/0x250
? driver_allows_async_probing+0x120/0x120
bus_for_each_drv+0x123/0x1a0
? bus_rescan_devices+0x20/0x20
? lockdep_hardirqs_on_prepare+0x273/0x3e0
? trace_hardirqs_on+0x1c/0x120
__device_attach+0x207/0x330
? device_bind_driver+0xb0/0xb0
? kobject_uevent_env+0x230/0x12c0
bus_probe_device+0x1a2/0x260
device_add+0xa61/0x1ce0
? __fw_devlink_link_to_suppliers+0x550/0x550
usb_new_device.cold+0x463/0xf66
? hub_disconnect+0x400/0x400
? _raw_spin_unlock_irq+0x24/0x30
hub_event+0x10d5/0x3330
? hub_port_debounce+0x280/0x280
? __lock_acquire+0x1671/0x5790
? wq_calc_node_cpumask+0x170/0x2a0
? lock_release+0x640/0x640
? rcu_read_lock_sched_held+0xa1/0xd0
? rcu_read_lock_bh_held+0xb0/0xb0
? lockdep_hardirqs_on_prepare+0x273/0x3e0
process_one_work+0x873/0x13e0
? lock_release+0x640/0x640
? pwq_dec_nr_in_flight+0x320/0x320
? rwlock_bug.part.0+0x90/0x90
worker_thread+0x8b/0xd10
? __kthread_parkme+0xd9/0x1d0
? pr
---truncated---
CVSS Score
7.1
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
blk-mq: use quiesced elevator switch when reinitializing queues
The hctx's run_work may be racing with the elevator switch when
reinitializing hardware queues. The queue is merely frozen in this
context, but that only prevents requests from allocating and doesn't
stop the hctx work from running. The work may get an elevator pointer
that's being torn down, and can result in use-after-free errors and
kernel panics (example below). Use the quiesced elevator switch instead,
and make the previous one static since it is now only used locally.
nvme nvme0: resetting controller
nvme nvme0: 32/0/0 default/read/poll queues
BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 80000020c8861067 P4D 80000020c8861067 PUD 250f8c8067 PMD 0
Oops: 0000 [#1] SMP PTI
Workqueue: kblockd blk_mq_run_work_fn
RIP: 0010:kyber_has_work+0x29/0x70
...
Call Trace:
__blk_mq_do_dispatch_sched+0x83/0x2b0
__blk_mq_sched_dispatch_requests+0x12e/0x170
blk_mq_sched_dispatch_requests+0x30/0x60
__blk_mq_run_hw_queue+0x2b/0x50
process_one_work+0x1ef/0x380
worker_thread+0x2d/0x3e0
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
blk-iolatency: Fix memory leak on add_disk() failures
When a gendisk is successfully initialized but add_disk() fails such as when
a loop device has invalid number of minor device numbers specified,
blkcg_init_disk() is called during init and then blkcg_exit_disk() during
error handling. Unfortunately, iolatency gets initialized in the former but
doesn't get cleaned up in the latter.
This is because, in non-error cases, the cleanup is performed by
del_gendisk() calling rq_qos_exit(), the assumption being that rq_qos
policies, iolatency being one of them, can only be activated once the disk
is fully registered and visible. That assumption is true for wbt and iocost,
but not so for iolatency as it gets initialized before add_disk() is called.
It is desirable to lazy-init rq_qos policies because they are optional
features and add to hot path overhead once initialized - each IO has to walk
all the registered rq_qos policies. So, we want to switch iolatency to lazy
init too. However, that's a bigger change. As a fix for the immediate
problem, let's just add an extra call to rq_qos_exit() in blkcg_exit_disk().
This is safe because duplicate calls to rq_qos_exit() become noop's.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix uninititialized value in 'ext4_evict_inode'
Syzbot found the following issue:
=====================================================
BUG: KMSAN: uninit-value in ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180
ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180
evict+0x365/0x9a0 fs/inode.c:664
iput_final fs/inode.c:1747 [inline]
iput+0x985/0xdd0 fs/inode.c:1773
__ext4_new_inode+0xe54/0x7ec0 fs/ext4/ialloc.c:1361
ext4_mknod+0x376/0x840 fs/ext4/namei.c:2844
vfs_mknod+0x79d/0x830 fs/namei.c:3914
do_mknodat+0x47d/0xaa0
__do_sys_mknodat fs/namei.c:3992 [inline]
__se_sys_mknodat fs/namei.c:3989 [inline]
__ia32_sys_mknodat+0xeb/0x150 fs/namei.c:3989
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
entry_SYSENTER_compat_after_hwframe+0x70/0x82
Uninit was created at:
__alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578
alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1794 [inline]
allocate_slab+0x1b5/0x1010 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429
alloc_inode_sb include/linux/fs.h:3117 [inline]
ext4_alloc_inode+0x5f/0x860 fs/ext4/super.c:1321
alloc_inode+0x83/0x440 fs/inode.c:259
new_inode_pseudo fs/inode.c:1018 [inline]
new_inode+0x3b/0x430 fs/inode.c:1046
__ext4_new_inode+0x2a7/0x7ec0 fs/ext4/ialloc.c:959
ext4_mkdir+0x4d5/0x1560 fs/ext4/namei.c:2992
vfs_mkdir+0x62a/0x870 fs/namei.c:4035
do_mkdirat+0x466/0x7b0 fs/namei.c:4060
__do_sys_mkdirat fs/namei.c:4075 [inline]
__se_sys_mkdirat fs/namei.c:4073 [inline]
__ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4073
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
entry_SYSENTER_compat_after_hwframe+0x70/0x82
CPU: 1 PID: 4625 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================
Now, 'ext4_alloc_inode()' didn't init 'ei->i_flags'. If new inode failed
before set 'ei->i_flags' in '__ext4_new_inode()', then do 'iput()'. As after
6bc0d63dad7f commit will access 'ei->i_flags' in 'ext4_evict_inode()' which
will lead to access uninit-value.
To solve above issue just init 'ei->i_flags' in 'ext4_alloc_inode()'.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
media: solo6x10: fix possible memory leak in solo_sysfs_init()
If device_register() returns error in solo_sysfs_init(), the
name allocated by dev_set_name() need be freed. As comment of
device_register() says, it should use put_device() to give up
the reference in the error path. So fix this by calling
put_device(), then the name can be freed in kobject_cleanup().
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata
Following concurrent processes:
P1(drop cache) P2(kworker)
drop_caches_sysctl_handler
drop_slab
shrink_slab
down_read(&shrinker_rwsem) - LOCK A
do_shrink_slab
super_cache_scan
prune_icache_sb
dispose_list
evict
ext4_evict_inode
ext4_clear_inode
ext4_discard_preallocations
ext4_mb_load_buddy_gfp
ext4_mb_init_cache
ext4_read_block_bitmap_nowait
ext4_read_bh_nowait
submit_bh
dm_submit_bio
do_worker
process_deferred_bios
commit
metadata_operation_failed
dm_pool_abort_metadata
down_write(&pmd->root_lock) - LOCK B
__destroy_persistent_data_objects
dm_block_manager_destroy
dm_bufio_client_destroy
unregister_shrinker
down_write(&shrinker_rwsem)
thin_map |
dm_thin_find_block ↓
down_read(&pmd->root_lock) --> ABBA deadlock
, which triggers hung task:
[ 76.974820] INFO: task kworker/u4:3:63 blocked for more than 15 seconds.
[ 76.976019] Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
[ 76.978521] task:kworker/u4:3 state:D stack:0 pid:63 ppid:2
[ 76.978534] Workqueue: dm-thin do_worker
[ 76.978552] Call Trace:
[ 76.978564] __schedule+0x6ba/0x10f0
[ 76.978582] schedule+0x9d/0x1e0
[ 76.978588] rwsem_down_write_slowpath+0x587/0xdf0
[ 76.978600] down_write+0xec/0x110
[ 76.978607] unregister_shrinker+0x2c/0xf0
[ 76.978616] dm_bufio_client_destroy+0x116/0x3d0
[ 76.978625] dm_block_manager_destroy+0x19/0x40
[ 76.978629] __destroy_persistent_data_objects+0x5e/0x70
[ 76.978636] dm_pool_abort_metadata+0x8e/0x100
[ 76.978643] metadata_operation_failed+0x86/0x110
[ 76.978649] commit+0x6a/0x230
[ 76.978655] do_worker+0xc6e/0xd90
[ 76.978702] process_one_work+0x269/0x630
[ 76.978714] worker_thread+0x266/0x630
[ 76.978730] kthread+0x151/0x1b0
[ 76.978772] INFO: task test.sh:2646 blocked for more than 15 seconds.
[ 76.979756] Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
[ 76.982111] task:test.sh state:D stack:0 pid:2646 ppid:2459
[ 76.982128] Call Trace:
[ 76.982139] __schedule+0x6ba/0x10f0
[ 76.982155] schedule+0x9d/0x1e0
[ 76.982159] rwsem_down_read_slowpath+0x4f4/0x910
[ 76.982173] down_read+0x84/0x170
[ 76.982177] dm_thin_find_block+0x4c/0xd0
[ 76.982183] thin_map+0x201/0x3d0
[ 76.982188] __map_bio+0x5b/0x350
[ 76.982195] dm_submit_bio+0x2b6/0x930
[ 76.982202] __submit_bio+0x123/0x2d0
[ 76.982209] submit_bio_noacct_nocheck+0x101/0x3e0
[ 76.982222] submit_bio_noacct+0x389/0x770
[ 76.982227] submit_bio+0x50/0xc0
[ 76.982232] submit_bh_wbc+0x15e/0x230
[ 76.982238] submit_bh+0x14/0x20
[ 76.982241] ext4_read_bh_nowait+0xc5/0x130
[ 76.982247] ext4_read_block_bitmap_nowait+0x340/0xc60
[ 76.982254] ext4_mb_init_cache+0x1ce/0xdc0
[ 76.982259] ext4_mb_load_buddy_gfp+0x987/0xfa0
[ 76.982263] ext4_discard_preallocations+0x45d/0x830
[ 76.982274] ext4_clear_inode+0x48/0xf0
[ 76.982280] ext4_evict_inode+0xcf/0xc70
[ 76.982285] evict+0x119/0x2b0
[ 76.982290] dispose_list+0x43/0xa0
[ 76.982294] prune_icache_sb+0x64/0x90
[ 76.982298] super_cache_scan+0x155/0x210
[ 76.982303] do_shrink_slab+0x19e/0x4e0
[ 76.982310] shrink_slab+0x2bd/0x450
[ 76.982317] drop_slab+0xcc/0x1a0
[ 76.982323] drop_caches_sysctl_handler+0xb7/0xe0
[ 76.982327] proc_sys_call_handler+0x1bc/0x300
[ 76.982331] proc_sys_write+0x17/0x20
[ 76.982334] vfs_write+0x3d3/0x570
[ 76.982342] ksys_write+0x73/0x160
[ 76.982347] __x64_sys_write+0x1e/0x30
[ 76.982352] do_syscall_64+0x35/0x80
[ 76.982357] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Funct
---truncated---
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
vme: Fix error not catched in fake_init()
In fake_init(), __root_device_register() is possible to fail but it's
ignored, which can cause unregistering vme_root fail when exit.
general protection fault,
probably for non-canonical address 0xdffffc000000008c
KASAN: null-ptr-deref in range [0x0000000000000460-0x0000000000000467]
RIP: 0010:root_device_unregister+0x26/0x60
Call Trace:
<TASK>
__x64_sys_delete_module+0x34f/0x540
do_syscall_64+0x38/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Return error when __root_device_register() fails.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
ARM: OMAP2+: omap4-common: Fix refcount leak bug
In omap4_sram_init(), of_find_compatible_node() will return a node
pointer with refcount incremented. We should use of_node_put() when
it is not used anymore.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
media: si470x: Fix use-after-free in si470x_int_in_callback()
syzbot reported use-after-free in si470x_int_in_callback() [1]. This
indicates that urb->context, which contains struct si470x_device
object, is freed when si470x_int_in_callback() is called.
The cause of this issue is that si470x_int_in_callback() is called for
freed urb.
si470x_usb_driver_probe() calls si470x_start_usb(), which then calls
usb_submit_urb() and si470x_start(). If si470x_start_usb() fails,
si470x_usb_driver_probe() doesn't kill urb, but it just frees struct
si470x_device object, as depicted below:
si470x_usb_driver_probe()
...
si470x_start_usb()
...
usb_submit_urb()
retval = si470x_start()
return retval
if (retval < 0)
free struct si470x_device object, but don't kill urb
This patch fixes this issue by killing urb when si470x_start_usb()
fails and urb is submitted. If si470x_start_usb() fails and urb is
not submitted, i.e. submitting usb fails, it just frees struct
si470x_device object.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
r6040: Fix kmemleak in probe and remove
There is a memory leaks reported by kmemleak:
unreferenced object 0xffff888116111000 (size 2048):
comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s)
hex dump (first 32 bytes):
00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................
08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff815bcd82>] kmalloc_trace+0x22/0x60
[<ffffffff827e20ee>] phy_device_create+0x4e/0x90
[<ffffffff827e6072>] get_phy_device+0xd2/0x220
[<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0
[<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0
[<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040]
...
The problem occurs in probe process as follows:
r6040_init_one:
mdiobus_register
mdiobus_scan <- alloc and register phy_device,
the reference count of phy_device is 3
r6040_mii_probe
phy_connect <- connect to the first phy_device,
so the reference count of the first
phy_device is 4, others are 3
register_netdev <- fault inject succeeded, goto error handling path
// error handling path
err_out_mdio_unregister:
mdiobus_unregister(lp->mii_bus);
err_out_mdio:
mdiobus_free(lp->mii_bus); <- the reference count of the first
phy_device is 1, it is not released
and other phy_devices are released
// similarly, the remove process also has the same problem
The root cause is traced to the phy_device is not disconnected when
removes one r6040 device in r6040_remove_one() or on error handling path
after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet
device is connected to the first PHY device of mii_bus, in order to
notify the connected driver when the link status changes, which is the
default behavior of the PHY infrastructure to handle everything.
Therefore the phy_device should be disconnected when removes one r6040
device or on error handling path.
Fix it by adding phy_disconnect() when removes one r6040 device or on
error handling path after r6040_mii probed successfully.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07