Summary
It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
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:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- File system notification infrastructure;
- Overlay file system;
- Proc file system;
- SMB network file system;
- Timer subsystem;
- Kernel CPU control infrastructure;
- Memory management;
- Networking core;
- DCCP (Datagram Congestion Control Protocol);
- IPv6 networking;
- IEEE 802.15.4 subsystem;
- Open vSwitch;
- Network traffic control;
- VMware vSockets driver;
(CVE-2025-21943, CVE-2025-21672, CVE-2024-57952, CVE-2024-57949,
CVE-2025-21683, CVE-2025-21690, CVE-2025-21699, CVE-2025-21676,
CVE-2024-57924, CVE-2025-21694, CVE-2024-57948, CVE-2025-21675,
CVE-2024-57951, CVE-2025-21692, CVE-2025-21684, CVE-2025-21668,
CVE-2025-21665, CVE-2025-21667, CVE-2025-21670, CVE-2025-21674,
CVE-2025-21697, CVE-2024-53124, CVE-2025-21666, CVE-2025-21682,
CVE-2025-21680, CVE-2025-21681, CVE-2025-21691, CVE-2025-21669,
CVE-2025-21673, CVE-2024-50157, CVE-2025-21689, CVE-2025-21678)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | linux-gcp-6.8 | 6.8.0-1031.33~22.04.1 |
| Ubuntu · 24.04 LTS 24.04:LTS | linux-gcp | 6.8.0-1031.33 |
Vulnerabilities 33
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Critical 9.8
smb: client: fix double free of TCP_Server_Info::hostname
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double free of TCP_Server_Info::hostname When shutting down the server in cifs_put_tcp_session(), cifsd thread might be reconnecting to multiple DFS targets before it realize…
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High 7.8
hrtimers: Handle CPU state correctly on hotplug
In the Linux kernel, the following vulnerability has been resolved: hrtimers: Handle CPU state correctly on hotplug Consider a scenario where a CPU transitions from CPUHP_ONLINE to halfway through a CPU hotunplug down to CPUHP_HRTIMERS_PREPARE, and then back …
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High 7.8
vsock/virtio: discard packets if the transport changes
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected …
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High 7.8
gtp: Destroy device along with udp socket's netns dismantle.
In the Linux kernel, the following vulnerability has been resolved: gtp: Destroy device along with udp socket's netns dismantle. gtp_newlink() links the device to a list in dev_net(dev) instead of src_net, where a udp tunnel socket is created. Even when src_n…
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High 7.8
pktgen: Avoid out-of-bounds access in get_imix_entries
In the Linux kernel, the following vulnerability has been resolved: pktgen: Avoid out-of-bounds access in get_imix_entries Passing a sufficient amount of imix entries leads to invalid access to the pkt_dev->imix_entries array because of the incorrect boundary…
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High 7.8CVE-2025-21692 Public exploit
net: sched: fix ets qdisc OOB Indexing
In the Linux kernel, the following vulnerability has been resolved: net: sched: fix ets qdisc OOB Indexing Haowei Yan <g1042620637@gmail.com> found that ets_class_from_arg() can index an Out-Of-Bound class in ets_class_from_arg() when passed clid of 0. The ov…
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High 7.8
drm/v3d: Ensure job pointer is set to NULL after job completion
In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Ensure job pointer is set to NULL after job completion After a job completes, the corresponding pointer in the device must be set to NULL. Failing to do so triggers a warning when un…
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High 7.8
gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
In the Linux kernel, the following vulnerability has been resolved: gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag Truncate an inode's address space when flipping the GFS2_DIF_JDATA flag: depending on that flag, the pages in the address space …
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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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High 7.5
net: fec: handle page_pool_dev_alloc_pages error
In the Linux kernel, the following vulnerability has been resolved: net: fec: handle page_pool_dev_alloc_pages error The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did not handle the case when it returned NULL. There was a WARN_ON(!new_p…
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High 7.3
eth: bnxt: always recalculate features after XDP clearing, fix null-deref
In the Linux kernel, the following vulnerability has been resolved: eth: bnxt: always recalculate features after XDP clearing, fix null-deref Recalculate features when XDP is detached. Before: # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp # ip li set d…
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High 7.1
Revert "libfs: fix infinite directory reads for offset dir"
In the Linux kernel, the following vulnerability has been resolved: Revert "libfs: fix infinite directory reads for offset dir" The current directory offset allocator (based on mtree_alloc_cyclic) stores the next offset value to return in octx->next_offset. T…
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Medium 5.9
cifs.upcall makes an upcall to the wrong namespace in containerized environments
A flaw was found in cifs-utils. When trying to obtain Kerberos credentials, the cifs.upcall program from the cifs-utils package makes an upcall to the wrong namespace in containerized environments. This issue may lead to disclosing sensitive data from the hos…
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Medium 5.5
irqchip/gic-v3-its: Don't enable interrupts in its_irq_set_vcpu_affinity()
In the Linux kernel, the following vulnerability has been resolved: irqchip/gic-v3-its: Don't enable interrupts in its_irq_set_vcpu_affinity() The following call-chain leads to enabling interrupts in a nested interrupt disabled section: irq_set_vcpu_affinity(…
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Medium 5.5
filemap: avoid truncating 64-bit offset to 32 bits
In the Linux kernel, the following vulnerability has been resolved: filemap: avoid truncating 64-bit offset to 32 bits On 32-bit kernels, folio_seek_hole_data() was inadvertently truncating a 64-bit value to 32 bits, leading to a possible infinite loop when w…
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Medium 5.5
vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see …
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Medium 5.5
iomap: avoid avoid truncating 64-bit offset to 32 bits
In the Linux kernel, the following vulnerability has been resolved: iomap: avoid avoid truncating 64-bit offset to 32 bits on 32-bit kernels, iomap_write_delalloc_scan() was inadvertently using a 32-bit position due to folio_next_index() returning an unsigned…
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Medium 5.5
vsock/bpf: return early if transport is not assigned
In the Linux kernel, the following vulnerability has been resolved: vsock/bpf: return early if transport is not assigned Some of the core functions can only be called if the transport has been assigned. As Michal reported, a socket might have the transport at…
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Medium 5.5
afs: Fix merge preference rule failure condition
In the Linux kernel, the following vulnerability has been resolved: afs: Fix merge preference rule failure condition syzbot reported a lock held when returning to userspace[1]. This is because if argc is less than 0 and the function returns directly, the held…
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Medium 5.5
net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel Attempt to enable IPsec packet offload in tunnel mode in debug kernel generates the following kernel panic, which is ha…
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Medium 5.5
net/mlx5: Clear port select structure when fail to create
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Clear port select structure when fail to create Clear the port select structure on error so no stale values left after definers are destroyed. That's because the mlx5_lag_destroy_de…
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Medium 5.5
bpf: Fix bpf_sk_select_reuseport() memory leak
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sk_select_reuseport() memory leak As pointed out in the original comment, lookup in sockmap can return a TCP ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_…
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Medium 5.5
USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
In the Linux kernel, the following vulnerability has been resolved: USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb() This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following: if (newp…
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Medium 5.5
scsi: storvsc: Ratelimit warning logs to prevent VM denial of service
In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Ratelimit warning logs to prevent VM denial of service If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU…
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Medium 5.5
fs/proc: fix softlockup in __read_vmcore (part 2)
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone dow…
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Medium 4.7
gpio: aggregator: protect driver attr handlers against module unload
In the Linux kernel, the following vulnerability has been resolved: gpio: aggregator: protect driver attr handlers against module unload Both new_device_store and delete_device_store touch module global resources (e.g. gpio_aggregator_lock). To prevent race c…
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Unscored —
RDMA/bnxt_re: Avoid CPU lockups due fifo occupancy check loop
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Avoid CPU lockups due fifo occupancy check loop Driver waits indefinitely for the fifo occupancy to go below a threshold as soon as the pacing interrupt is received. This can ca…
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Unscored —
fs: relax assertions on failure to encode file handles
In the Linux kernel, the following vulnerability has been resolved: fs: relax assertions on failure to encode file handles Encoding file handles is usually performed by a filesystem >encode_fh() method that may fail for various reasons. The legacy users of ex…
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Unscored —
mac802154: check local interfaces before deleting sdata list
In the Linux kernel, the following vulnerability has been resolved: mac802154: check local interfaces before deleting sdata list syzkaller reported a corrupted list in ieee802154_if_remove. [1] Remove an IEEE 802.15.4 network interface after unregister an IEE…
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Unscored —
pmdomain: imx8mp-blk-ctrl: add missing loop break condition
In the Linux kernel, the following vulnerability has been resolved: pmdomain: imx8mp-blk-ctrl: add missing loop break condition Currently imx8mp_blk_ctrl_remove() will continue the for loop until an out-of-bounds exception occurs. pstate: 60000005 (nZCv daif …
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Unscored —
openvswitch: fix lockup on tx to unregistering netdev with carrier
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fixes tag attempted to fix the issue in the following sequence of calls: do_output -> ovs_vport_send -> dev_queu…
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Unscored —
gpio: xilinx: Convert gpio_lock to raw spinlock
In the Linux kernel, the following vulnerability has been resolved: gpio: xilinx: Convert gpio_lock to raw spinlock irq_chip functions may be called in raw spinlock context. Therefore, we must also use a raw spinlock for our own internal locking. This fixes t…
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Unscored —
cachestat: fix page cache statistics permission checking
In the Linux kernel, the following vulnerability has been resolved: cachestat: fix page cache statistics permission checking When the 'cachestat()' system call was added in commit cf264e1329fb ("cachestat: implement cachestat syscall"), it was meant to be a m…
References
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report
https://ubuntu.com/security/CVE-2024-50157
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report
https://ubuntu.com/security/CVE-2024-53124
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report
https://ubuntu.com/security/CVE-2024-57924
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report
https://ubuntu.com/security/CVE-2024-57948
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report
https://ubuntu.com/security/CVE-2024-57949
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report
https://ubuntu.com/security/CVE-2024-57951
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report
https://ubuntu.com/security/CVE-2024-57952
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report
https://ubuntu.com/security/CVE-2025-2312
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report
https://ubuntu.com/security/CVE-2025-21665
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report
https://ubuntu.com/security/CVE-2025-21666
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report
https://ubuntu.com/security/CVE-2025-21667
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report
https://ubuntu.com/security/CVE-2025-21668
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report
https://ubuntu.com/security/CVE-2025-21669
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report
https://ubuntu.com/security/CVE-2025-21670
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report
https://ubuntu.com/security/CVE-2025-21672
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report
https://ubuntu.com/security/CVE-2025-21673
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report
https://ubuntu.com/security/CVE-2025-21674
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report
https://ubuntu.com/security/CVE-2025-21675
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report
https://ubuntu.com/security/CVE-2025-21676
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report
https://ubuntu.com/security/CVE-2025-21678
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report
https://ubuntu.com/security/CVE-2025-21680
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report
https://ubuntu.com/security/CVE-2025-21681
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report
https://ubuntu.com/security/CVE-2025-21682
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report
https://ubuntu.com/security/CVE-2025-21683
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report
https://ubuntu.com/security/CVE-2025-21684
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report
https://ubuntu.com/security/CVE-2025-21689
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report
https://ubuntu.com/security/CVE-2025-21690
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report
https://ubuntu.com/security/CVE-2025-21691
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report
https://ubuntu.com/security/CVE-2025-21692
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report
https://ubuntu.com/security/CVE-2025-21694
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report
https://ubuntu.com/security/CVE-2025-21697
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report
https://ubuntu.com/security/CVE-2025-21699
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report
https://ubuntu.com/security/CVE-2025-21943