Linux: >> Linux Kernel >> 4.19.112 Security Vulnerabilities
In the Linux kernel, the following vulnerability has been resolved:
fs: dlm: fix invalid derefence of sb_lvbptr
I experience issues when putting a lkbsb on the stack and have sb_lvbptr
field to a dangled pointer while not using DLM_LKF_VALBLK. It will crash
with the following kernel message, the dangled pointer is here
0xdeadbeef as example:
[ 102.749317] BUG: unable to handle page fault for address: 00000000deadbeef
[ 102.749320] #PF: supervisor read access in kernel mode
[ 102.749323] #PF: error_code(0x0000) - not-present page
[ 102.749325] PGD 0 P4D 0
[ 102.749332] Oops: 0000 [#1] PREEMPT SMP PTI
[ 102.749336] CPU: 0 PID: 1567 Comm: lock_torture_wr Tainted: G W 5.19.0-rc3+ #1565
[ 102.749343] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-2.module+el8.7.0+15506+033991b0 04/01/2014
[ 102.749344] RIP: 0010:memcpy_erms+0x6/0x10
[ 102.749353] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
[ 102.749355] RSP: 0018:ffff97a58145fd08 EFLAGS: 00010202
[ 102.749358] RAX: ffff901778b77070 RBX: 0000000000000000 RCX: 0000000000000040
[ 102.749360] RDX: 0000000000000040 RSI: 00000000deadbeef RDI: ffff901778b77070
[ 102.749362] RBP: ffff97a58145fd10 R08: ffff901760b67a70 R09: 0000000000000001
[ 102.749364] R10: ffff9017008e2cb8 R11: 0000000000000001 R12: ffff901760b67a70
[ 102.749366] R13: ffff901760b78f00 R14: 0000000000000003 R15: 0000000000000001
[ 102.749368] FS: 0000000000000000(0000) GS:ffff901876e00000(0000) knlGS:0000000000000000
[ 102.749372] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 102.749374] CR2: 00000000deadbeef CR3: 000000017c49a004 CR4: 0000000000770ef0
[ 102.749376] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 102.749378] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 102.749379] PKRU: 55555554
[ 102.749381] Call Trace:
[ 102.749382] <TASK>
[ 102.749383] ? send_args+0xb2/0xd0
[ 102.749389] send_common+0xb7/0xd0
[ 102.749395] _unlock_lock+0x2c/0x90
[ 102.749400] unlock_lock.isra.56+0x62/0xa0
[ 102.749405] dlm_unlock+0x21e/0x330
[ 102.749411] ? lock_torture_stats+0x80/0x80 [dlm_locktorture]
[ 102.749416] torture_unlock+0x5a/0x90 [dlm_locktorture]
[ 102.749419] ? preempt_count_sub+0xba/0x100
[ 102.749427] lock_torture_writer+0xbd/0x150 [dlm_locktorture]
[ 102.786186] kthread+0x10a/0x130
[ 102.786581] ? kthread_complete_and_exit+0x20/0x20
[ 102.787156] ret_from_fork+0x22/0x30
[ 102.787588] </TASK>
[ 102.787855] Modules linked in: dlm_locktorture torture rpcsec_gss_krb5 intel_rapl_msr intel_rapl_common kvm_intel iTCO_wdt iTCO_vendor_support kvm vmw_vsock_virtio_transport qxl irqbypass vmw_vsock_virtio_transport_common drm_ttm_helper crc32_pclmul joydev crc32c_intel ttm vsock virtio_scsi virtio_balloon snd_pcm drm_kms_helper virtio_console snd_timer snd drm soundcore syscopyarea i2c_i801 sysfillrect sysimgblt i2c_smbus pcspkr fb_sys_fops lpc_ich serio_raw
[ 102.792536] CR2: 00000000deadbeef
[ 102.792930] ---[ end trace 0000000000000000 ]---
This patch fixes the issue by checking also on DLM_LKF_VALBLK on exflags
is set when copying the lvbptr array instead of if it's just null which
fixes for me the issue.
I think this patch can fix other dlm users as well, depending how they
handle the init, freeing memory handling of sb_lvbptr and don't set
DLM_LKF_VALBLK for some dlm_lock() calls. It might a there could be a
hidden issue all the time. However with checking on DLM_LKF_VALBLK the
user always need to provide a sb_lvbptr non-null value. There might be
more intelligent handling between per ls lvblen, DLM_LKF_VALBLK and
non-null to report the user the way how DLM API is used is wrong but can
be added for later, this will only fix the current behaviour.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
parisc: Fix locking in pdc_iodc_print() firmware call
Utilize pdc_lock spinlock to protect parallel modifications of the
iodc_dbuf[] buffer, check length to prevent buffer overflow of
iodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong
indentings.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: replace WARN_ONs by nilfs_error for checkpoint acquisition failure
If creation or finalization of a checkpoint fails due to anomalies in the
checkpoint metadata on disk, a kernel warning is generated.
This patch replaces the WARN_ONs by nilfs_error, so that a kernel, booted
with panic_on_warn, does not panic. A nilfs_error is appropriate here to
handle the abnormal filesystem condition.
This also replaces the detected error codes with an I/O error so that
neither of the internal error codes is returned to callers.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()
As comment of pci_get_class() says, it returns a pci_device with its
refcount increased and decreased the refcount for the input parameter
@from if it is not NULL.
If we break the loop in radeon_atrm_get_bios() with 'pdev' not NULL, we
need to call pci_dev_put() to decrease the refcount. Add the missing
pci_dev_put() to avoid refcount leak.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: mxm-wmi: fix memleak in mxm_wmi_call_mx[ds|mx]()
The ACPI buffer memory (out.pointer) returned by wmi_evaluate_method()
is not freed after the call, so it leads to memory leak.
The method results in ACPI buffer is not used, so just pass NULL to
wmi_evaluate_method() which fixes the memory leak.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_hid: fix refcount leak on error path
When failing to allocate report_desc, opts->refcnt has already been
incremented so it needs to be decremented to avoid leaving the options
structure permanently locked.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-07
In the Linux kernel, the following vulnerability has been resolved:
media: dvb-core: Fix double free in dvb_register_device()
In function dvb_register_device() -> dvb_register_media_device() ->
dvb_create_media_entity(), dvb->entity is allocated and initialized. If
the initialization fails, it frees the dvb->entity, and return an error
code. The caller takes the error code and handles the error by calling
dvb_media_device_free(), which unregisters the entity and frees the
field again if it is not NULL. As dvb->entity may not NULLed in
dvb_create_media_entity() when the allocation of dvbdev->pad fails, a
double free may occur. This may also cause an Use After free in
media_device_unregister_entity().
Fix this by storing NULL to dvb->entity when it is freed.
CVSS Score
7.8
EPSS Score
0.0
Published
2025-10-04
In the Linux kernel, the following vulnerability has been resolved:
netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources_register() failed
If some items in nsim_dev_resources_register() fail, memory leak will
occur. The following is the memory leak information.
unreferenced object 0xffff888074c02600 (size 128):
comm "echo", pid 8159, jiffies 4294945184 (age 493.530s)
hex dump (first 32 bytes):
40 47 ea 89 ff ff ff ff 01 00 00 00 00 00 00 00 @G..............
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
backtrace:
[<0000000011a31c98>] kmalloc_trace+0x22/0x60
[<0000000027384c69>] devl_resource_register+0x144/0x4e0
[<00000000a16db248>] nsim_drv_probe+0x37a/0x1260
[<000000007d1f448c>] really_probe+0x20b/0xb10
[<00000000c416848a>] __driver_probe_device+0x1b3/0x4a0
[<00000000077e0351>] driver_probe_device+0x49/0x140
[<0000000054f2465a>] __device_attach_driver+0x18c/0x2a0
[<000000008538f359>] bus_for_each_drv+0x151/0x1d0
[<0000000038e09747>] __device_attach+0x1c9/0x4e0
[<00000000dd86e533>] bus_probe_device+0x1d5/0x280
[<00000000839bea35>] device_add+0xae0/0x1cb0
[<000000009c2abf46>] new_device_store+0x3b6/0x5f0
[<00000000fb823d7f>] bus_attr_store+0x72/0xa0
[<000000007acc4295>] sysfs_kf_write+0x106/0x160
[<000000005f50cb4d>] kernfs_fop_write_iter+0x3a8/0x5a0
[<0000000075eb41bf>] vfs_write+0x8f0/0xc80
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-04
In the Linux kernel, the following vulnerability has been resolved:
media: coda: Add check for dcoda_iram_alloc
As the coda_iram_alloc may return NULL pointer,
it should be better to check the return value
in order to avoid NULL poineter dereference,
same as the others.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-04
In the Linux kernel, the following vulnerability has been resolved:
mtd: lpddr2_nvm: Fix possible null-ptr-deref
It will cause null-ptr-deref when resource_size(add_range) invoked,
if platform_get_resource() returns NULL.
CVSS Score
5.5
EPSS Score
0.0
Published
2025-10-04