Summary
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Network drivers;
- Device tree and open firmware driver;
- SCSI subsystem;
- TTY drivers;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Bluetooth subsystem;
- Packet sockets;
- Network traffic control;
- VMware vSockets driver;
(CVE-2025-38350, CVE-2024-57996, CVE-2025-37752, CVE-2025-38617,
CVE-2025-38477, CVE-2025-38083, CVE-2024-38541, CVE-2023-52757,
CVE-2023-52975, CVE-2025-38618, CVE-2024-49950, CVE-2024-50073,
CVE-2025-37785, CVE-2025-21796, CVE-2025-38683, CVE-2025-37797)
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro FIPS-updates 20.04 LTS Pro:FIPS-updates:20.04:LTS | linux-azure-fips | 5.4.0-1155.162+fips1 |
Vulnerabilities 16
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Critical 9.8
nfsd: clear acl_access/acl_default after releasing them
In the Linux kernel, the following vulnerability has been resolved: nfsd: clear acl_access/acl_default after releasing them If getting acl_default fails, acl_access and acl_default will be released simultaneously. However, acl_access will still retain a point…
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High 8.8
Bluetooth: L2CAP: Fix uaf in l2cap_connect
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix uaf in l2cap_connect [Syzbot reported] BUG: KASAN: slab-use-after-free in l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949 Read of size 8 at addr …
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High 7.8
scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress
In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress Bug report and analysis from Ding Hui. During iSCSI session logout, if another task accesses the shost ipaddress attr…
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High 7.8
of: module: add buffer overflow check in of_modalias()
In the Linux kernel, the following vulnerability has been resolved: of: module: add buffer overflow check in of_modalias() In of_modalias(), if the buffer happens to be too small even for the 1st snprintf() call, the len parameter will become negative and str…
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High 7.8
tty: n_gsm: Fix use-after-free in gsm_cleanup_mux
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: Fix use-after-free in gsm_cleanup_mux BUG: KASAN: slab-use-after-free in gsm_cleanup_mux+0x77b/0x7b0 drivers/tty/n_gsm.c:3160 [n_gsm] Read of size 8 at addr ffff88815fe99c00 by ta…
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High 7.8
net_sched: sch_sfq: don't allow 1 packet limit
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: don't allow 1 packet limit The current implementation does not work correctly with a limit of 1. iproute2 actually checks for this and this patch adds the check in kernel …
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High 7.8
net_sched: sch_sfq: move the limit validation
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are c…
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High 7.8
ext4: fix OOB read when checking dotdot dir
In the Linux kernel, the following vulnerability has been resolved: ext4: fix OOB read when checking dotdot dir Mounting a corrupted filesystem with directory which contains '.' dir entry with rec_len == block size results in out-of-bounds read (later on, whe…
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High 7.8
net_sched: hfsc: Fix a UAF vulnerability in class handling
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-us…
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High 7.8
net_sched: prio: fix a race in prio_tune()
In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock roo…
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High 7.8
net/sched: Always pass notifications when child class becomes empty
In the Linux kernel, the following vulnerability has been resolved: net/sched: Always pass notifications when child class becomes empty Certain classful qdiscs may invoke their classes' dequeue handler on an enqueue operation. This may unexpectedly empty the …
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High 7.8
net/sched: sch_qfq: Fix race condition on qfq_aggregate
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurren…
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High 7.8
net/packet: fix a race in packet_set_ring() and packet_notifier()
In the Linux kernel, the following vulnerability has been resolved: net/packet: fix a race in packet_set_ring() and packet_notifier() When packet_set_ring() releases po->bind_lock, another thread can run packet_notifier() and process an NETDEV_UP event. This …
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High 7.8
vsock: Do not allow binding to VMADDR_PORT_ANY
In the Linux kernel, the following vulnerability has been resolved: vsock: Do not allow binding to VMADDR_PORT_ANY It is possible for a vsock to autobind to VMADDR_PORT_ANY. This can cause a use-after-free when a connection is made to the bound socket. The so…
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Unscored —
smb: client: fix potential deadlock when releasing mids
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential deadlock when releasing mids All release_mid() callers seem to hold a reference of @mid so there is no need to call kref_put(&mid->refcount, __release_mid) under @s…
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Unscored —
hv_netvsc: Fix panic during namespace deletion with VF
In the Linux kernel, the following vulnerability has been resolved: hv_netvsc: Fix panic during namespace deletion with VF The existing code move the VF NIC to new namespace when NETDEV_REGISTER is received on netvsc NIC. During deletion of the namespace, def…
References
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report
https://ubuntu.com/security/CVE-2023-52757
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report
https://ubuntu.com/security/CVE-2023-52975
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report
https://ubuntu.com/security/CVE-2024-38541
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report
https://ubuntu.com/security/CVE-2024-49950
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report
https://ubuntu.com/security/CVE-2024-50073
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report
https://ubuntu.com/security/CVE-2024-57996
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report
https://ubuntu.com/security/CVE-2025-21796
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report
https://ubuntu.com/security/CVE-2025-37752
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report
https://ubuntu.com/security/CVE-2025-37785
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report
https://ubuntu.com/security/CVE-2025-37797
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report
https://ubuntu.com/security/CVE-2025-38083
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report
https://ubuntu.com/security/CVE-2025-38350
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report
https://ubuntu.com/security/CVE-2025-38477
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report
https://ubuntu.com/security/CVE-2025-38617
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report
https://ubuntu.com/security/CVE-2025-38618
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report
https://ubuntu.com/security/CVE-2025-38683