Summary
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
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:
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Ethernet team driver;
- Framebuffer layer;
- BTRFS file system;
- Ext4 file system;
- Network file system (NFS) server daemon;
- Timer subsystem;
- DCCP (Datagram Congestion Control Protocol);
- IPv6 networking;
- NET/ROM layer;
- Packet sockets;
- Network traffic control;
- SCTP protocol;
- VMware vSockets driver;
- USB sound devices;
(CVE-2023-52574, CVE-2023-52650, CVE-2024-35849, CVE-2024-41006,
CVE-2024-49924, CVE-2024-50006, CVE-2024-50299, CVE-2024-53124,
CVE-2024-53150, CVE-2024-56767, CVE-2025-21796, CVE-2025-37785,
CVE-2025-37838, CVE-2025-38352, CVE-2025-38477, CVE-2025-38617,
CVE-2025-38618)
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | linux-kvm | 4.15.0-1168.173 |
Vulnerabilities 18
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High 7.8
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() …
KEV Sep 4, 2025 -
High 7.1CVE-2024-53150 Exploited
ALSA: usb-audio: Fix out of bounds reads when finding clock sources
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out of bounds reads when finding clock sources The current USB-audio driver code doesn't check bLength of each descriptor at traversing for clock descriptors. That is, wh…
KEV Apr 9, 2025 -
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 8.2
sctp: properly validate chunk size in sctp_sf_ootb()
In the Linux kernel, the following vulnerability has been resolved: sctp: properly validate chunk size in sctp_sf_ootb() A size validation fix similar to that in Commit 50619dbf8db7 ("sctp: add size validation when walking chunks") is also required in sctp_sf…
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High 7.8
team: fix null-ptr-deref when team device type is changed
In the Linux kernel, the following vulnerability has been resolved: team: fix null-ptr-deref when team device type is changed Get a null-ptr-deref bug as follows with reproducer [1]. BUG: kernel NULL pointer dereference, address: 0000000000000228 ... RIP: 001…
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High 7.8
fbdev: pxafb: Fix possible use after free in pxafb_task()
In the Linux kernel, the following vulnerability has been resolved: fbdev: pxafb: Fix possible use after free in pxafb_task() In the pxafb_probe function, it calls the pxafb_init_fbinfo function, after which &fbi->task is associated with pxafb_task. Moreover,…
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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
HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition
In the Linux kernel, the following vulnerability has been resolved: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition In the ssi_protocol_probe() function, &ssi->work is bound with ssip_xmit_work(), In ssip_pn_se…
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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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High 7.5
net: fix data-races around sk->sk_forward_alloc
In the Linux kernel, the following vulnerability has been resolved: net: fix data-races around sk->sk_forward_alloc Syzkaller reported this warning: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 16 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x1c…
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Unscored —
drm/tegra: dsi: Add missing check for of_find_device_by_node
In the Linux kernel, the following vulnerability has been resolved: drm/tegra: dsi: Add missing check for of_find_device_by_node Add check for the return value of of_find_device_by_node() and return the error if it fails in order to avoid NULL pointer derefer…
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Unscored —
btrfs: fix information leak in btrfs_ioctl_logical_to_ino()
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix information leak in btrfs_ioctl_logical_to_ino() Syzbot reported the following information leak for in btrfs_ioctl_logical_to_ino(): BUG: KMSAN: kernel-infoleak in instrument_copy_…
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Unscored —
netrom: Fix a memory leak in nr_heartbeat_expiry()
In the Linux kernel, the following vulnerability has been resolved: netrom: Fix a memory leak in nr_heartbeat_expiry() syzbot reported a memory leak in nr_create() [0]. Commit 409db27e3a2e ("netrom: Fix use-after-free of a listening socket.") added sock_hold(…
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Unscored —
ext4: fix i_data_sem unlock order in ext4_ind_migrate()
In the Linux kernel, the following vulnerability has been resolved: ext4: fix i_data_sem unlock order in ext4_ind_migrate() Fuzzing reports a possible deadlock in jbd2_log_wait_commit. This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require s…
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Unscored —
dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset
In the Linux kernel, the following vulnerability has been resolved: dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset The at_xdmac_memset_create_desc may return NULL, which will lead to a null pointer dereference. For example, the len inpu…
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Unscored —
x86/vmscape: Add conditional IBPB mitigation
In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing …
References
-
report
https://ubuntu.com/security/CVE-2023-52574
-
report
https://ubuntu.com/security/CVE-2023-52650
-
report
https://ubuntu.com/security/CVE-2024-35849
-
report
https://ubuntu.com/security/CVE-2024-41006
-
report
https://ubuntu.com/security/CVE-2024-49924
-
report
https://ubuntu.com/security/CVE-2024-50006
-
report
https://ubuntu.com/security/CVE-2024-50299
-
report
https://ubuntu.com/security/CVE-2024-53124
-
report
https://ubuntu.com/security/CVE-2024-53150
-
report
https://ubuntu.com/security/CVE-2024-56767
-
report
https://ubuntu.com/security/CVE-2025-21796
-
report
https://ubuntu.com/security/CVE-2025-37785
-
report
https://ubuntu.com/security/CVE-2025-37838
-
report
https://ubuntu.com/security/CVE-2025-38352
-
report
https://ubuntu.com/security/CVE-2025-38477
-
report
https://ubuntu.com/security/CVE-2025-38617
-
report
https://ubuntu.com/security/CVE-2025-38618
-
report
https://ubuntu.com/security/CVE-2025-40300