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:
- GPU drivers;
- Network drivers;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Network namespace;
- Bluetooth subsystem;
- Networking core;
- IPv6 networking;
- Network traffic control;
(CVE-2024-56651, CVE-2021-47119, CVE-2025-21700, CVE-2025-21702,
CVE-2024-49974, CVE-2024-56658, CVE-2024-53237, CVE-2025-21703,
CVE-2024-26928, CVE-2024-26915, CVE-2024-35958, CVE-2024-50256,
CVE-2024-35864, CVE-2024-46826)
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro FIPS-updates 20.04 LTS Pro:FIPS-updates:20.04:LTS | linux-aws-fips | 5.4.0-1144.155+fips1 |
Vulnerabilities 14
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Critical 9.8
smb: client: fix potential UAF in smb2_is_valid_lease_break()
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_is_valid_lease_break() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.
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High 8.8
Bluetooth: fix use-after-free in device_for_each_child()
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix use-after-free in device_for_each_child() Syzbot has reported the following KASAN splat: BUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0 Read of size 8 at …
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High 8.8
can: hi311x: hi3110_can_ist(): fix potential use-after-free
In the Linux kernel, the following vulnerability has been resolved: can: hi311x: hi3110_can_ist(): fix potential use-after-free The commit a22bd630cfff ("can: hi311x: do not report txerr and rxerr during bus-off") removed the reporting of rxerr and txerr even…
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High 7.8
net: ena: Fix incorrect descriptor free behavior
In the Linux kernel, the following vulnerability has been resolved: net: ena: Fix incorrect descriptor free behavior ENA has two types of TX queues: - queues which only process TX packets arriving from the network stack - queues which only process TX packets …
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High 7.8
net: defer final 'struct net' free in netns dismantle
In the Linux kernel, the following vulnerability has been resolved: net: defer final 'struct net' free in netns dismantle Ilya reported a slab-use-after-free in dst_destroy [1] Issue is in xfrm6_net_init() and xfrm4_net_init() : They copy xfrm[46]_dst_ops_tem…
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High 7.8
net: sched: Disallow replacing of child qdisc from one parent to another
In the Linux kernel, the following vulnerability has been resolved: net: sched: Disallow replacing of child qdisc from one parent to another Lion Ackermann was able to create a UAF which can be abused for privilege escalation with the following script Step 1.…
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High 7.8
pfifo_tail_enqueue: Drop new packet when sch->limit == 0
In the Linux kernel, the following vulnerability has been resolved: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 Expected behaviour: In case we reach scheduler's limit, pfifo_tail_enqueue() will drop a packet in scheduler's queue and decrease sche…
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High 7.8
netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of th…
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High 7.5
netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6() I got a syzbot report without a repro [1] crashing in nf_send_reset6() I think the issue is that dev->hard_header_len is zer…
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Medium 5.5
drm/amdgpu: Reset IH OVERFLOW_CLEAR bit
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Reset IH OVERFLOW_CLEAR bit Allows us to detect subsequent IH ring buffer overflows as well.
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Unscored —
ext4: fix memory leak in ext4_fill_super
In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_fill_super Buffer head references must be released before calling kill_bdev(); otherwise the buffer head (and its page referenced by b_data) will not be freed by…
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Unscored —
smb: client: fix potential UAF in cifs_debug_files_proc_show()
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in cifs_debug_files_proc_show() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.
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Unscored —
ELF: fix kernel.randomize_va_space double read
In the Linux kernel, the following vulnerability has been resolved: ELF: fix kernel.randomize_va_space double read ELF loader uses "randomize_va_space" twice. It is sysctl and can change at any moment, so 2 loads could see 2 different values in theory with un…
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Unscored —
NFSD: Limit the number of concurrent async COPY operations
In the Linux kernel, the following vulnerability has been resolved: NFSD: Limit the number of concurrent async COPY operations Nothing appears to limit the number of concurrent async COPY operations that clients can start. In addition, AFAICT each async COPY …
References
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report
https://ubuntu.com/security/CVE-2021-47119
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report
https://ubuntu.com/security/CVE-2024-26915
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report
https://ubuntu.com/security/CVE-2024-26928
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report
https://ubuntu.com/security/CVE-2024-35864
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report
https://ubuntu.com/security/CVE-2024-35958
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report
https://ubuntu.com/security/CVE-2024-46826
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report
https://ubuntu.com/security/CVE-2024-49974
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report
https://ubuntu.com/security/CVE-2024-50256
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report
https://ubuntu.com/security/CVE-2024-53237
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report
https://ubuntu.com/security/CVE-2024-56651
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report
https://ubuntu.com/security/CVE-2024-56658
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report
https://ubuntu.com/security/CVE-2025-21700
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report
https://ubuntu.com/security/CVE-2025-21702
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report
https://ubuntu.com/security/CVE-2025-21703