Linux: >> Linux Kernel >> 5.18.5 Security Vulnerabilities
In the Linux kernel, the following vulnerability has been resolved:
remoteproc: imx_dsp_rproc: Add mutex protection for workqueue
The workqueue may execute late even after remoteproc is stopped or
stopping, some resources (rpmsg device and endpoint) have been
released in rproc_stop_subdevices(), then rproc_vq_interrupt()
accessing these resources will cause kennel dump.
Call trace:
virtqueue_add_split+0x1ac/0x560
virtqueue_add_inbuf+0x4c/0x60
rpmsg_recv_done+0x15c/0x294
vring_interrupt+0x6c/0xa4
rproc_vq_interrupt+0x30/0x50
imx_dsp_rproc_vq_work+0x24/0x40 [imx_dsp_rproc]
process_one_work+0x1d0/0x354
worker_thread+0x13c/0x470
kthread+0x154/0x160
ret_from_fork+0x10/0x20
Add mutex protection in imx_dsp_rproc_vq_work(), if the state is
not running, then just skip calling rproc_vq_interrupt().
Also the flush workqueue operation can't be added in rproc stop
for the same reason. The call sequence is
rproc_shutdown
-> rproc_stop
->rproc_stop_subdevices
->rproc->ops->stop()
->imx_dsp_rproc_stop
->flush_work
-> rproc_vq_interrupt
The resource needed by rproc_vq_interrupt has been released in
rproc_stop_subdevices, so flush_work is not safe to be called in
imx_dsp_rproc_stop.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
ALSA: ac97: fix possible memory leak in snd_ac97_dev_register()
If device_register() fails in snd_ac97_dev_register(), it should
call put_device() to give up reference, or the name allocated in
dev_set_name() is leaked.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix off-by-one errors in fast-commit block filling
Due to several different off-by-one errors, or perhaps due to a late
change in design that wasn't fully reflected in the code that was
actually merged, there are several very strange constraints on how
fast-commit blocks are filled with tlv entries:
- tlvs must start at least 10 bytes before the end of the block, even
though the minimum tlv length is 8. Otherwise, the replay code will
ignore them. (BUG: ext4_fc_reserve_space() could violate this
requirement if called with a len of blocksize - 9 or blocksize - 8.
Fortunately, this doesn't seem to happen currently.)
- tlvs must end at least 1 byte before the end of the block. Otherwise
the replay code will consider them to be invalid. This quirk
contributed to a bug (fixed by an earlier commit) where uninitialized
memory was being leaked to disk in the last byte of blocks.
Also, strangely these constraints don't apply to the replay code in
e2fsprogs, which will accept any tlvs in the blocks (with no bounds
checks at all, but that is a separate issue...).
Given that this all seems to be a bug, let's fix it by just filling
blocks with tlv entries in the natural way.
Note that old kernels will be unable to replay fast-commit journals
created by kernels that have this commit.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
memory: of: Fix refcount leak bug in of_lpddr3_get_ddr_timings()
We should add the of_node_put() when breaking out of
for_each_child_of_node() as it will automatically increase
and decrease the refcount.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
mmc: vub300: fix warning - do not call blocking ops when !TASK_RUNNING
vub300_enable_sdio_irq() works with mutex and need TASK_RUNNING here.
Ensure that we mark current as TASK_RUNNING for sleepable context.
[ 77.554641] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff92a72c1d>] sdio_irq_thread+0x17d/0x5b0
[ 77.554652] WARNING: CPU: 2 PID: 1983 at kernel/sched/core.c:9813 __might_sleep+0x116/0x160
[ 77.554905] CPU: 2 PID: 1983 Comm: ksdioirqd/mmc1 Tainted: G OE 6.1.0-rc5 #1
[ 77.554910] Hardware name: Intel(R) Client Systems NUC8i7BEH/NUC8BEB, BIOS BECFL357.86A.0081.2020.0504.1834 05/04/2020
[ 77.554912] RIP: 0010:__might_sleep+0x116/0x160
[ 77.554920] RSP: 0018:ffff888107b7fdb8 EFLAGS: 00010282
[ 77.554923] RAX: 0000000000000000 RBX: ffff888118c1b740 RCX: 0000000000000000
[ 77.554926] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffed1020f6ffa9
[ 77.554928] RBP: ffff888107b7fde0 R08: 0000000000000001 R09: ffffed1043ea60ba
[ 77.554930] R10: ffff88821f5305cb R11: ffffed1043ea60b9 R12: ffffffff93aa3a60
[ 77.554932] R13: 000000000000011b R14: 7fffffffffffffff R15: ffffffffc0558660
[ 77.554934] FS: 0000000000000000(0000) GS:ffff88821f500000(0000) knlGS:0000000000000000
[ 77.554937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 77.554939] CR2: 00007f8a44010d68 CR3: 000000024421a003 CR4: 00000000003706e0
[ 77.554942] Call Trace:
[ 77.554944] <TASK>
[ 77.554952] mutex_lock+0x78/0xf0
[ 77.554973] vub300_enable_sdio_irq+0x103/0x3c0 [vub300]
[ 77.554981] sdio_irq_thread+0x25c/0x5b0
[ 77.555006] kthread+0x2b8/0x370
[ 77.555017] ret_from_fork+0x1f/0x30
[ 77.555023] </TASK>
[ 77.555025] ---[ end trace 0000000000000000 ]---
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
ALSA: aoa: i2sbus: fix possible memory leak in i2sbus_add_dev()
dev_set_name() in soundbus_add_one() allocates memory for name, it need be
freed when of_device_register() fails, call soundbus_dev_put() to give up
the reference that hold in device_initialize(), so that it can be freed in
kobject_cleanup() when the refcount hit to 0. And other resources are also
freed in i2sbus_release_dev(), so it can return 0 directly.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
kernfs: fix use-after-free in __kernfs_remove
Syzkaller managed to trigger concurrent calls to
kernfs_remove_by_name_ns() for the same file resulting in
a KASAN detected use-after-free. The race occurs when the root
node is freed during kernfs_drain().
To prevent this acquire an additional reference for the root
of the tree that is removed before calling __kernfs_remove().
Found by syzkaller with the following reproducer (slab_nomerge is
required):
syz_mount_image$ext4(0x0, &(0x7f0000000100)='./file0\x00', 0x100000, 0x0, 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='/proc/self/exe\x00', 0x0, 0x0)
close(r0)
pipe2(&(0x7f0000000140)={0xffffffffffffffff, <r1=>0xffffffffffffffff}, 0x800)
mount$9p_fd(0x0, &(0x7f0000000040)='./file0\x00', &(0x7f00000000c0), 0x408, &(0x7f0000000280)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}, 0x2c, {[{@cache_loose}, {@mmap}, {@loose}, {@loose}, {@mmap}], [{@mask={'mask', 0x3d, '^MAY_EXEC'}}, {@fsmagic={'fsmagic', 0x3d, 0x10001}}, {@dont_hash}]}})
Sample report:
==================================================================
BUG: KASAN: use-after-free in kernfs_type include/linux/kernfs.h:335 [inline]
BUG: KASAN: use-after-free in kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline]
BUG: KASAN: use-after-free in __kernfs_remove.part.0+0x843/0x960 fs/kernfs/dir.c:1369
Read of size 2 at addr ffff8880088807f0 by task syz-executor.2/857
CPU: 0 PID: 857 Comm: syz-executor.2 Not tainted 6.0.0-rc3-00363-g7726d4c3e60b #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x6e/0x91 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x5e/0x5e5 mm/kasan/report.c:433
kasan_report+0xa3/0x130 mm/kasan/report.c:495
kernfs_type include/linux/kernfs.h:335 [inline]
kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline]
__kernfs_remove.part.0+0x843/0x960 fs/kernfs/dir.c:1369
__kernfs_remove fs/kernfs/dir.c:1356 [inline]
kernfs_remove_by_name_ns+0x108/0x190 fs/kernfs/dir.c:1589
sysfs_slab_add+0x133/0x1e0 mm/slub.c:5943
__kmem_cache_create+0x3e0/0x550 mm/slub.c:4899
create_cache mm/slab_common.c:229 [inline]
kmem_cache_create_usercopy+0x167/0x2a0 mm/slab_common.c:335
p9_client_create+0xd4d/0x1190 net/9p/client.c:993
v9fs_session_init+0x1e6/0x13c0 fs/9p/v9fs.c:408
v9fs_mount+0xb9/0xbd0 fs/9p/vfs_super.c:126
legacy_get_tree+0xf1/0x200 fs/fs_context.c:610
vfs_get_tree+0x85/0x2e0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x675/0x1d00 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x282/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f725f983aed
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f725f0f7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f725faa3f80 RCX: 00007f725f983aed
RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f725f9f419c R08: 0000000020000280 R09: 0000000000000000
R10: 0000000000000408 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000006 R14: 00007f725faa3f80 R15: 00007f725f0d7000
</TASK>
Allocated by task 855:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:437 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:7
---truncated---
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
crypto: hisilicon/hpre - fix resource leak in remove process
In hpre_remove(), when the disable operation of qm sriov failed,
the following logic should continue to be executed to release the
remaining resources that have been allocated, instead of returning
directly, otherwise there will be resource leakage.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
rpmsg: char: Avoid double destroy of default endpoint
The rpmsg_dev_remove() in rpmsg_core is the place for releasing
this default endpoint.
So need to avoid destroying the default endpoint in
rpmsg_chrdev_eptdev_destroy(), this should be the same as
rpmsg_eptdev_release(). Otherwise there will be double destroy
issue that ept->refcount report warning:
refcount_t: underflow; use-after-free.
Call trace:
refcount_warn_saturate+0xf8/0x150
virtio_rpmsg_destroy_ept+0xd4/0xec
rpmsg_dev_remove+0x60/0x70
The issue can be reproduced by stopping remoteproc before
closing the /dev/rpmsgX.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-01
In the Linux kernel, the following vulnerability has been resolved:
scsi: libsas: Fix use-after-free bug in smp_execute_task_sg()
When executing SMP task failed, the smp_execute_task_sg() calls del_timer()
to delete "slow_task->timer". However, if the timer handler
sas_task_internal_timedout() is running, the del_timer() in
smp_execute_task_sg() will not stop it and a UAF will happen. The process
is shown below:
(thread 1) | (thread 2)
smp_execute_task_sg() | sas_task_internal_timedout()
... |
del_timer() |
... | ...
sas_free_task(task) |
kfree(task->slow_task) //FREE|
| task->slow_task->... //USE
Fix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure
the timer handler have finished before the "task->slow_task" is
deallocated.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-01