Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2025-40300: 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 mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit. Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo. [ dhansen: elaborate on suboptimal IBPB solution ] CVE-2025-39927: In the Linux kernel, the following vulnerability has been resolved: ceph: fix race condition validating r_parent before applying state CVE-2025-39926: In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM CVE-2025-39917: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt CVE-2025-39916: In the Linux kernel, the following vulnerability has been resolved: mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters() CVE-2025-39914: In the Linux kernel, the following vulnerability has been resolved: tracing: Silence warning when chunk allocation fails in trace_pid_write CVE-2025-39913: In the Linux kernel, the following vulnerability has been resolved: tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork. CVE-2025-39912: In the Linux kernel, the following vulnerability has been resolved: nfs/localio: restore creds before releasing pageio data CVE-2025-39909: In the Linux kernel, the following vulnerability has been resolved: mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters() CVE-2025-39886: In the Linux kernel, the following vulnerability has been resolved: bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init() CVE-2025-39884: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix subvolume deletion lockup caused by inodes xarray race CVE-2025-39883: In the Linux kernel, the following vulnerability has been resolved: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory CVE-2025-39881: In the Linux kernel, the following vulnerability has been resolved: kernfs: Fix UAF in polling when open file is released CVE-2025-39880: In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info CVE-2025-39877: In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix use-after-free in state_show() CVE-2025-39830: In the Linux kernel, the following vulnerability has been resolved: net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path CVE-2025-39677: In the Linux kernel, the following vulnerability has been resolved: net/sched: Fix backlog accounting in qdisc_dequeue_internal CVE-2025-38248: In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix use-after-free during router port configuration
Fixed packages 22
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | bpftool6.12 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | bpftool6.12-debuginfo | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel-livepatch-6.12.48-67.114 | 1:1.0-0.amzn2023 |
| Amazon Linux · 2023 | kernel6.12 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-debuginfo | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-debuginfo-common-aarch64 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-debuginfo-common-x86_64 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-devel | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-headers | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-libbpf | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-libbpf-debuginfo | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-libbpf-devel | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-libbpf-static | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-modules-extra | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-modules-extra-common | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-tools | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-tools-debuginfo | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | kernel6.12-tools-devel | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | perf6.12 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | perf6.12-debuginfo | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | python3-perf6.12 | 1:6.12.48-67.114.amzn2023 |
| Amazon Linux · 2023 | python3-perf6.12-debuginfo | 1:6.12.48-67.114.amzn2023 |
Vulnerabilities 18
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Critical 9.8
libceph: fix invalid accesses to ceph_connection_v1_info
In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without ch…
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High 7.8CVE-2025-38248 Public exploit
bridge: mcast: Fix use-after-free during router port configuration
In the Linux kernel, the following vulnerability has been resolved: bridge: mcast: Fix use-after-free during router port configuration The bridge maintains a global list of ports behind which a multicast router resides. The list is consulted during forwarding…
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High 7.8
net/sched: Fix backlog accounting in qdisc_dequeue_internal
In the Linux kernel, the following vulnerability has been resolved: net/sched: Fix backlog accounting in qdisc_dequeue_internal This issue applies for the following qdiscs: hhf, fq, fq_codel, and fq_pie, and occurs in their change handlers when adjusting to t…
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High 7.8
kernfs: Fix UAF in polling when open file is released
In the Linux kernel, the following vulnerability has been resolved: kernfs: Fix UAF in polling when open file is released A use-after-free (UAF) vulnerability was identified in the PSI (Pressure Stall Information) monitoring mechanism: BUG: KASAN: slab-use-af…
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High 7.8
bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt Stanislav reported that in bpf_crypto_crypt() the destination dynptr's size is not validated to be at least as large as the source dynp…
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High 7.8
ceph: fix race condition validating r_parent before applying state
In the Linux kernel, the following vulnerability has been resolved: ceph: fix race condition validating r_parent before applying state Add validation to ensure the cached parent directory inode matches the directory info in MDS replies. This prevents client-s…
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Medium 5.5
net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path In the error path of hws_pool_buddy_init(), the buddy allocator cleanup doesn't free the allocator structure itself, causing a…
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Medium 5.5
bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
In the Linux kernel, the following vulnerability has been resolved: bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init() Currently, calling bpf_map_kmalloc_node() from __bpf_async_init() can cause various locking issues; see the following stac…
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Medium 5.5
nfs/localio: restore creds before releasing pageio data
In the Linux kernel, the following vulnerability has been resolved: nfs/localio: restore creds before releasing pageio data Otherwise if the nfsd filecache code releases the nfsd_file immediately, it can trigger the BUG_ON(cred == current->cred) in __put_cred…
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Medium 5.5
genetlink: fix genl_bind() invoking bind() after -EPERM
In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop pr…
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Medium 4.7
btrfs: fix subvolume deletion lockup caused by inodes xarray race
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix subvolume deletion lockup caused by inodes xarray race There is a race condition between inode eviction and inode caching that can cause a live struct btrfs_inode to be missing fro…
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Unscored —
mm/damon/sysfs: fix use-after-free in state_show()
In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix use-after-free in state_show() state_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. This allows a use-after-free race: CPU 0 CPU 1 ----- ----- state_sho…
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Unscored —
mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
In the Linux kernel, the following vulnerability has been resolved: mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory When I did memory failure tests, below panic occurs: page dumped because: VM_BUG_ON_PAGE(PagePoisoned(page)) ker…
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Unscored —
mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()
In the Linux kernel, the following vulnerability has been resolved: mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters() Patch series "mm/damon: avoid divide-by-zero in DAMON module's parameters application". DAMON's RECLAIM and LRU_SO…
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Unscored —CVE-2025-39913 Public exploit
tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork.
In the Linux kernel, the following vulnerability has been resolved: tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork. syzbot reported the splat below. [0] The repro does the following: 1. Load a sk_msg prog that calls bpf_…
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Unscored —
tracing: Silence warning when chunk allocation fails in trace_pid_write
In the Linux kernel, the following vulnerability has been resolved: tracing: Silence warning when chunk allocation fails in trace_pid_write Syzkaller trigger a fault injection warning: WARNING: CPU: 1 PID: 12326 at tracepoint_add_func+0xbfc/0xeb0 Modules link…
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Unscored —
mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()
In the Linux kernel, the following vulnerability has been resolved: mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters() When creating a new scheme of DAMON_RECLAIM, the calculation of 'min_age_region' uses 'aggr_interval' as the divisor…
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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
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-38248.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39677.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39830.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39877.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39880.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39881.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39883.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39884.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39886.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39909.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39912.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39913.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39914.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39916.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39917.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39926.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-39927.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-40300.html