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CVE-2026-74607— KVM: SVM: Serialize accesses to the owner and mirror list with separate lock

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： KVM: SVM：使用独立锁对所有者（owner）和镜像（mirror）列表的访问进行序列化 与 之间的交互可能导致两个独立的问题： 在 中，当目标 KVM 是镜像时，镜像条目会从源列表移动到所有者的 列表中，但与其他所有者的镜像列表写入函数（如 、 ）不同，此操作未持有所有者的锁。因此，并发的 COPY 或 DESTROY 操作可能与 产生竞态，从而导致列表损坏。 在 中，所有者仍处于活跃状态，可能同时接收一个 请求，导致 发生变化。在这种情况下，错误的 VM 会被调用

CVSS 8.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux b2125513dfc0dd0ec5a9605138a3c356592cfb73< 7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e affected
b2125513dfc0dd0ec5a9605138a3c356592cfb73< 28afde1edbd8b20058cbf4d75fb57876471ec334 affected
b2125513dfc0dd0ec5a9605138a3c356592cfb73< 328ab4fabe05af004d886659f8744076e320ddce affected
b2125513dfc0dd0ec5a9605138a3c356592cfb73< 47976eaaf0a4eb46dade48b3246779090db9e3ec affected
b2125513dfc0dd0ec5a9605138a3c356592cfb73< d728baba0f20e49439fc7831bf3e4e7dee82161a affected
b2125513dfc0dd0ec5a9605138a3c356592cfb73< 1d78d33275ef2a16c6d080910b291d0a97a0e613 affected
5.18 affected
< 5.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74607

Vulnerability Information
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Vulnerability Title
KVM: SVM: Serialize accesses to the owner and mirror list with separate lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Serialize accesses to the owner and mirror list with separate lock Interaction between KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM and KVM_CAP_VM_COPY_ENC_CONTEXT_FROM can cause two separate issues: - in sev_migrate_from(), when the destination KVM is a mirror, the mirror entry is moved from the source's list to the owner's mirror_vms list, without holding the owner's lock unlike other writers of the owner's mirror list (sev_vm_copy_enc_context_from(), sev_vm_destroy()). A concurrent COPY or destroy can race with sev_migrate_from() and corrupt the list. - In sev_vm_destroy(), the *owner* is still active and could receive concurrently a KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM that causes sev->enc_context_owner to change. In this case the incorrect VM receives kvm_put_kvm(). The second issue needs particular care because the owner could disappear altogether (even though the race window is impossibly small) between reading it and locking it. There is thus no way to perform the checks under the owner lock without putting struct kvm under SLAB_TYPESAFE_BY_RCU (which would allow kvm_get_kvm_safe() under RCU critical section). It is much simpler to just use a global lock, since the critical sections are so small and the new lock is always a leaf lock.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b2125513dfc0dd0ec5a9605138a3c356592cfb73 ~ 7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-74607

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III. Intelligence Information for CVE-2026-74607

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Patches & Fixes for CVE-2026-74607 (5)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74607

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