CVE-2026-89922— KVM: s390: Take srcu when importing watchpoint data
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，以下漏洞已得到修复： KVM: s390：在导入观察点（watchpoint）数据时持有 srcu 函数使用 来备份观察点所对应的原始客户机（guest）内存内容。 底层调用的是 ，后者通过 解析内存槽（memslot）。该操作要求必须持有 （或 ），否则，在并发更新内存槽时，一旦其 SRCU 宽限期（grace period）结束，当前的内存槽数组可能会被释放，从而导致问题。 由于该操作并非快速路径（non-fast path），按照锁的顺序（先获取互斥锁，再获取 srcu），采取“重锤”
Possible ATT&CK Techniques 1 AI
T1646Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 27291e2165b6de70c476b7b675308113edd69a60< 6830fbc3724bf49c142aae69a4694f115fa9cedd |
affected |
27291e2165b6de70c476b7b675308113edd69a60< f8e3a9997d5ecd56ebe4b262ff424516c068fecb |
affected | ||
27291e2165b6de70c476b7b675308113edd69a60< 76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 |
affected | ||
27291e2165b6de70c476b7b675308113edd69a60< cc710ee45395efb4937e042960f791d33924e5f6 |
affected | ||
27291e2165b6de70c476b7b675308113edd69a60< 4c05bf21d1806853e662cc19e744736a3408f155 |
affected | ||
27291e2165b6de70c476b7b675308113edd69a60< a4e482def8533ebace517d9f67f1465841b1f982 |
affected | ||
3.16 |
affected | ||
< 3.16 |
unaffected | ||
| … +6 more rows | |||
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-89922
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
KVM: s390: Take srcu when importing watchpoint data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: s390: Take srcu when importing watchpoint data
__import_wp_info() backs up the original guest memory contents of a
watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore
resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or
kvm->slots_lock) to be held, otherwise a concurrent memslot update can
free the memslots array under us once its SRCU grace period has elapsed.
As this is not fast path, following lock ordering (mutex first, then
srcu) take the big hammer and hold the srcu for the full import.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-89922
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-89922
请登录查看更多情报信息。
Other References for CVE-2026-89922 (6)
Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total
| CVE-2026-90048 | 9.8 CRITICAL | fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() |
| CVE-2026-90012 | 9.8 CRITICAL | spi: Fix DMA mapping ownership on partial map failure |
| CVE-2026-89970 | 9.8 CRITICAL | nvmet-auth: Synchronize timeout work during SQ teardown |
| CVE-2026-89857 | 9.8 CRITICAL | scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject |
| CVE-2026-89969 | 9.8 CRITICAL | nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU |
| CVE-2026-89847 | 9.8 CRITICAL | scsi: qla2xxx: Avoid double completion in async IOCB timeout |
| CVE-2026-89972 | 9.8 CRITICAL | nvme: add missing SRCU grace period in error path |
| CVE-2026-89990 | 9.8 CRITICAL | ceph: lock mutex in ceph_mds_check_access() |
| CVE-2026-90036 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during blocked-lock reaping |
| CVE-2026-90038 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during export state revocation |
| CVE-2026-90037 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during close_lru reaping |
| CVE-2026-89788 | 9.8 CRITICAL | ksmbd: fix tree connection use-after-free in smb2_tree_connect() |
| CVE-2026-89783 | 9.8 CRITICAL | xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full |
| CVE-2026-90042 | 9.8 CRITICAL | ceph: properly decrypt filenames in vmalloc() buffers |
| CVE-2026-89778 | 9.8 CRITICAL | isofs: fix out-of-bounds page array access on empty zisofs block |
| CVE-2026-89915 | 9.3 CRITICAL | KVM: arm64: Remove VM-wide VNCR mapping counter |
| CVE-2026-90049 | 9.3 CRITICAL | net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() |
| CVE-2026-89775 | 9.3 CRITICAL | KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation |
| CVE-2026-89916 | 9.3 CRITICAL | KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry |
| CVE-2026-89930 | 9.3 CRITICAL | KVM: nVMX: Service local TLB flushes on failed nested VM-Enter |
Showing top 20 of 276 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-89922
No comments yet