Linux: >> Linux Kernel >> 4.18.6 Security Vulnerabilities
In the Linux kernel, the following vulnerability has been resolved:
clk: qcom: gfx3d: add parent to parent request map
After commit d228ece36345 ("clk: divider: remove round_rate() in favor
of determine_rate()") determining GFX3D clock rate crashes, because the
passed parent map doesn't provide the expected best_parent_hw clock
(with the roundd_rate path before the offending commit the
best_parent_hw was ignored).
Set the field in parent_req in addition to setting it in the req,
fixing the crash.
clk_hw_round_rate (drivers/clk/clk.c:1764) (P)
clk_divider_bestdiv (drivers/clk/clk-divider.c:336)
divider_determine_rate (drivers/clk/clk-divider.c:358)
clk_alpha_pll_postdiv_determine_rate (drivers/clk/qcom/clk-alpha-pll.c:1275)
clk_core_determine_round_nolock (drivers/clk/clk.c:1606)
clk_core_round_rate_nolock (drivers/clk/clk.c:1701)
__clk_determine_rate (drivers/clk/clk.c:1741)
clk_gfx3d_determine_rate (drivers/clk/qcom/clk-rcg2.c:1268)
clk_core_determine_round_nolock (drivers/clk/clk.c:1606)
clk_core_round_rate_nolock (drivers/clk/clk.c:1701)
clk_core_round_rate_nolock (drivers/clk/clk.c:1710)
clk_round_rate (drivers/clk/clk.c:1804)
dev_pm_opp_set_rate (drivers/opp/core.c:1440 (discriminator 1))
msm_devfreq_target (drivers/gpu/drm/msm/msm_gpu_devfreq.c:51)
devfreq_set_target (drivers/devfreq/devfreq.c:360)
devfreq_update_target (drivers/devfreq/devfreq.c:426)
devfreq_monitor (drivers/devfreq/devfreq.c:458)
process_one_work (arch/arm64/include/asm/jump_label.h:36 include/trace/events/workqueue.h:110 kernel/workqueue.c:3284)
worker_thread (kernel/workqueue.c:3356 (discriminator 2) kernel/workqueue.c:3443 (discriminator 2))
kthread (kernel/kthread.c:467)
ret_from_fork (arch/arm64/kernel/entry.S:861)
CVSS Score
5.5
EPSS Score
0.0
Published
2026-06-03
In the Linux kernel, the following vulnerability has been resolved:
smb: client: reject userspace cifs.spnego descriptions
cifs.spnego key descriptions contain authority-bearing fields such as
pid, uid, creduid, and upcall_target that cifs.upcall treats as
kernel-originating inputs. However, userspace can also create keys of
this type through request_key(2) or add_key(2), allowing those fields to
be supplied without CIFS origin.
Only accept cifs.spnego descriptions while CIFS is using its private
spnego_cred to request the key.
CVSS Score
7.1
EPSS Score
0.0
Published
2026-06-01
In the Linux kernel, the following vulnerability has been resolved:
staging: media: atomisp: Disallow all private IOCTLs
Disallow all private IOCTLs. These aren't quite as safe as one could
assume of IOCTL handlers; disable them for now. Instead of removing the
code, return in the beginning of the function if cmd is non-zero in order
to keep static checkers happy.
CVSS Score
7.8
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: fix integer overflow on buff_pos
Fixing an integer overflow present in batadv_iv_ogm_send_to_if. The size
check is done using the int type in batadv_iv_ogm_aggr_packet whereas the
buff_pos variable uses the s16 type. This could lead to an out-of-bound
read.
CVSS Score
8.8
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
spi: mpc52xx: fix controller deregistration
Make sure to deregister the controller before disabling and releasing
underlying resources like interrupts and gpios during driver unbind.
CVSS Score
5.5
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
Currently the runtime.oss.trigger field may be accessed concurrently
without protection, which may lead to the data race. And, in this
case, it may lead to more severe problem because it's a bit field; as
writing the data, it may overwrite other bit fields as well, which
confuses the operation completely, as spotted by fuzzing.
Fix it by covering runtime.oss.trigger bit fled also with the existing
params_lock mutex in both snd_pcm_oss_get_trigger() and
snd_pcm_oss_poll().
CVSS Score
7.8
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak
btrfs_ioctl_space_info() has a TOCTOU race between two passes over the
block group RAID type lists. The first pass counts entries to determine
the allocation size, then the second pass fills the buffer. The
groups_sem rwlock is released between passes, allowing concurrent block
group removal to reduce the entry count.
When the second pass fills fewer entries than the first pass counted,
copy_to_user() copies the full alloc_size bytes including trailing
uninitialized kmalloc bytes to userspace.
Fix by copying only total_spaces entries (the actually-filled count from
the second pass) instead of alloc_size bytes, and switch to kzalloc so
any future copy size mismatch cannot leak heap data.
CVSS Score
4.7
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix missing last_unlink_trans update when removing a directory
When removing a directory we are not updating its last_unlink_trans field,
which can result in incorrect fsync behaviour in case some one fsyncs the
directory after it was removed because it's holding a file descriptor on
it.
Example scenario:
mkdir /mnt/dir1
mkdir /mnt/dir1/dir2
mkdir /mnt/dir3
sync -f /mnt
# Do some change to the directory and fsync it.
chmod 700 /mnt/dir1
xfs_io -c fsync /mnt/dir1
# Move dir2 out of dir1 so that dir1 becomes empty.
mv /mnt/dir1/dir2 /mnt/dir3/
open fd on /mnt/dir1
call rmdir(2) on path "/mnt/dir1"
fsync fd
<trigger power failure>
When attempting to mount the filesystem, the log replay will fail with
an -EIO error and dmesg/syslog has the following:
[445771.626482] BTRFS info (device dm-0): first mount of filesystem 0368bbea-6c5e-44b5-b409-09abe496e650
[445771.626486] BTRFS info (device dm-0): using crc32c checksum algorithm
[445771.627912] BTRFS info (device dm-0): start tree-log replay
[445771.628335] page: refcount:2 mapcount:0 mapping:0000000061443ddc index:0x1d00 pfn:0x7072a5
[445771.629453] memcg:ffff89f400351b00
[445771.629892] aops:btree_aops [btrfs] ino:1
[445771.630737] flags: 0x17fffc00000402a(uptodate|lru|private|writeback|node=0|zone=2|lastcpupid=0x1ffff)
[445771.632359] raw: 017fffc00000402a fffff47284d950c8 fffff472907b7c08 ffff89f458e412b8
[445771.633713] raw: 0000000000001d00 ffff89f6c51d1a90 00000002ffffffff ffff89f400351b00
[445771.635029] page dumped because: eb page dump
[445771.635825] BTRFS critical (device dm-0): corrupt leaf: root=5 block=30408704 slot=10 ino=258, invalid nlink: has 2 expect no more than 1 for dir
[445771.638088] BTRFS info (device dm-0): leaf 30408704 gen 10 total ptrs 17 free space 14878 owner 5
[445771.638091] BTRFS info (device dm-0): refs 4 lock_owner 0 current 3581087
[445771.638094] item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160
[445771.638097] inode generation 3 transid 9 size 16 nbytes 16384
[445771.638098] block group 0 mode 40755 links 1 uid 0 gid 0
[445771.638100] rdev 0 sequence 2 flags 0x0
[445771.638102] atime 1775744884.0
[445771.660056] ctime 1775744885.645502983
[445771.660058] mtime 1775744885.645502983
[445771.660060] otime 1775744884.0
[445771.660062] item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12
[445771.660064] index 0 name_len 2
[445771.660066] item 2 key (256 DIR_ITEM 1843588421) itemoff 16077 itemsize 34
[445771.660068] location key (259 1 0) type 2
[445771.660070] transid 9 data_len 0 name_len 4
[445771.660075] item 3 key (256 DIR_ITEM 2363071922) itemoff 16043 itemsize 34
[445771.660076] location key (257 1 0) type 2
[445771.660077] transid 9 data_len 0 name_len 4
[445771.660078] item 4 key (256 DIR_INDEX 2) itemoff 16009 itemsize 34
[445771.660079] location key (257 1 0) type 2
[445771.660080] transid 9 data_len 0 name_len 4
[445771.660081] item 5 key (256 DIR_INDEX 3) itemoff 15975 itemsize 34
[445771.660082] location key (259 1 0) type 2
[445771.660083] transid 9 data_len 0 name_len 4
[445771.660084] item 6 key (257 INODE_ITEM 0) itemoff 15815 itemsize 160
[445771.660086] inode generation 9 transid 9 size 8 nbytes 0
[445771.660087] block group 0 mode 40777 links 1 uid 0 gid 0
[445771.660088] rdev 0 sequence 2 flags 0x0
[445771.660089] atime 1775744885.641174097
[445771.660090] ctime 1775744885.645502983
[445771.660091] mtime 1775744885.645502983
[445771.660105] otime 1775744885.641174097
[445771.660106] item 7 key (257 INODE_REF 256) itemoff 15801 itemsize 14
[445771.660107] index 2 name_len 4
[445771.660108] item 8 key (257 DIR_ITEM 2676584006) itemoff 15767 itemsize 34
[445771.660109] location key (2
---truncated---
CVSS Score
5.5
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
md/raid10: fix divide-by-zero in setup_geo() with zero far_copies
setup_geo() extracts near_copies (nc) and far_copies (fc) from the
user-provided layout parameter without checking for zero. When fc=0
with the "improved" far set layout selected, 'geo->far_set_size =
disks / fc' triggers a divide-by-zero.
Validate nc and fc immediately after extraction, returning -1 if
either is zero.
CVSS Score
5.5
EPSS Score
0.0
Published
2026-05-28
In the Linux kernel, the following vulnerability has been resolved:
fanotify: fix false positive on permission events
fsnotify_get_mark_safe() may return false for a mark on an unrelated group,
which results in bypassing the permission check.
Fix by skipping over detached marks that are not in the current group.
CVSS Score
7.1
EPSS Score
0.0
Published
2026-05-28