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ALSA-2025:13960 — Important: kernel security update

Affected: AlmaLinux:8: bpftool, AlmaLinux:8: kernel, AlmaLinux:8: kernel-abi-stablelists, AlmaLinux:8: kernel-core, AlmaLinux:8: kernel-cross-headers, AlmaLinux:8: kernel-debug, AlmaLinux:8: kernel-debug-core, AlmaLinux:8: kernel-debug-devel, AlmaLinux:8: kernel-debug-modules, AlmaLinux:8: kernel-debug-modules-extra and 15 more

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: drm/vkms: Fix use after free and double free on init error (CVE-2025-22097) * kernel: net_sched: ets: Fix double list add in class with netem as child qdisc (CVE-2025-37914) * kernel: Bluetooth: hci_core: Fix use-after-free in vhci_flush() (CVE-2025-38250) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-09577

BELL-CVE-2025-38250

Affected: Alpaquita:23: linux-lts, Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2025-avi-0722 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de Red Hat. Certaines d'entre elles permettent à un…

certfr-2025-avi-0722

EUVD-2026-346981

fkie_cve-2025-38250

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_core: Fix use-after-free in vhci_flush()

syzbot reported use-after-free in vhci_flush() without repro. [0]

From the splat, a thread close()d a vhci file descriptor while its device was being used by iotcl() on another thread.

Once the last fd refcnt is released, vhci_release() calls hci_unregister_dev(), hci_free_dev(), and kfree() for struct vhci_data, which is set to hci_dev->dev->driver_data.

The problem is that there is no synchronisation after unlinking hdev from hci_dev_list in hci_unregister_dev(). There might be another thread still accessing the hdev which was fetched before the unlink operation.

We can use SRCU for such synchronisation.

Let's run hci_dev_reset() under SRCU and wait for its completion in hci_unregister_dev().

Another option would be to restore hci_dev->destruct(), which was removed in commit 587ae086f6e4 ("Bluetooth: Remove unused hci-destruct cb"). However, this would not be a good solution, as we should not run hci_unregister_dev() while there are in-flight ioctl() requests, which could lead to another data-race KCSAN splat.

Note that other drivers seem to have the same problem, for exmaple, virtbt_remove().

[0]: BUG: KASAN: slab-use-after-free in skb_queue_empty_lockless include/linux/skbuff.h:1891 [inline] BUG: KASAN: slab-use-after-free in skb_queue_purge_reason+0x99/0x360 net/core/skbuff.c:3937 Read of size 8 at addr ffff88807cb8d858 by task syz.1.21…

GHSA-6r74-5vg7-24jv

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_core: Fix use-after-free in vhci_flush()

syzbot reported use-after-free in vhci_flush() without repro. [0]

From the splat, a thread close()d a vhci file descriptor while its device was being used by iotcl() on another thread.

Once the last fd refcnt is released, vhci_release() calls hci_unregister_dev(), hci_free_dev(), and kfree() for struct vhci_data, which is set to hci_dev->dev->driver_data.

We can use SRCU for such synchronisation.

Let's run hci_dev_reset() under SRCU and wait for its completion in hci_unregister_dev().

Note that other drivers seem to have the same problem, for exmaple, virtbt_remove().

msrc_CVE-2025-38250 — Bluetooth: hci_core: Fix use-after-free in vhci_flush()

msrc_CVE-2025-38250

OESA-2026-1341 — kernel security update

Affected: openEuler:22.03-LTS-SP4: kernel

The Linux Kernel, the operating system core itself. Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:kernel/resource: fix kfree() of bootmem memory againSince commit ebff7d8f270d ( mem hotunplug: fix kfree() of bootmemmemory ), we could get a resource allocated during boot viaalloc_resource(). And it s required to release the resource usingfree_resource(). Howerver, many people use kfree directly which willresult in kernel BUG. In order to fix this without fixing every callsite, just leak a couple of bytes in such corner case.(CVE-2022-49190)

In the Linux kernel, the following vulnerability has been resolved:drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()There is a deadlock in rtw_surveydone_event_callback(),which is shown below: (Thread 1) | (Thread 2) | _set_timer()rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...We hold pmlmepriv->lock in position (1) of thread 1 and usedel_timer_sync() to wait timer to stop, but timer handleralso need pmlmepriv->lock in position (2) of thread 2.As a result, rtw_surveydone_event_callback() will block forever.This patch extracts del_timer_sync() from the protection ofspin_lock_bh(), which could let timer handler to obta…

openSUSE-SU-2026:21555-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

RHSA-2025:13961 — Red Hat Security Advisory: kernel-rt security update

kernel: drm/vkms: Fix memory leak in vkms_init() kernel: drm/vkms: Fix null-ptr-deref in vkms_release() kernel: drm/vkms: Fix use after free and double free on init error kernel: net_sched: ets: Fix double list add in class with netem as child qdisc kernel: Bluetooth: hci_core: Fix use-after-free in vhci_flush()

SUSE-SU-2025:02846-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

UBUNTU-CVE-2025-38250

Affected: Ubuntu:Pro:14.04:LTS: linux, Ubuntu:Pro:14.04:LTS: linux-aws, Ubuntu:Pro:14.04:LTS: linux-azure, Ubuntu:Pro:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:16.04:LTS: linux, Ubuntu:Pro:16.04:LTS: linux-aws, Ubuntu:Pro:16.04:LTS: linux-aws-hwe, Ubuntu:Pro:16.04:LTS: linux-azure, Ubuntu:Pro:16.04:LTS: linux-gcp, Ubuntu:Pro:16.04:LTS: linux-hwe and 214 more

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix use-after-free in vhci_flush() syzbot reported use-after-free in vhci_flush() without repro. [0] From the splat, a thread close()d a vhci file descriptor while its device was being used by iotcl() on another thread. Once the last fd refcnt is released, vhci_release() calls hci_unregister_dev(), hci_free_dev(), and kfree() for struct vhci_data, which is set to hci_dev->dev->driver_data. The problem is that there is no synchronisation after unlinking hdev from hci_dev_list in hci_unregister_dev(). There might be another thread still accessing the hdev which was fetched before the unlink operation. We can use SRCU for such synchronisation. Let's run hci_dev_reset() under SRCU and wait for its completion in hci_unregister_dev(). Another option would be to restore hci_dev->destruct(), which was removed in commit 587ae086f6e4 ("Bluetooth: Remove unused hci-destruct cb"). However, this would not be a good solution, as we should not run hci_unregister_dev() while there are in-flight ioctl() requests, which could lead to another data-race KCSAN splat. Note that other drivers seem to have the same problem, for exmaple, virtbt_remove(). [0]: BUG: KASAN: slab-use-after-free in skb_queue_empty_lockless include/linux/skbuff.h:1891 [inline] BUG: KASAN: slab-use-after-free in skb_queue_purge_reason+0x99/0x360 net/core/skbuff.c:3937 Read of size 8 at addr ffff88807cb8d858 by task syz.1.219/6718 CPU…

WID-SEC-W-2025-1517 — Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen oder nicht näher spezifizierte Auswirkungen zu erzielen.