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CVE-2025-40300— x86/vmscape: Add conditional IBPB mitigation

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于分支预测器隔离不足，可能导致跨用户空间虚拟机攻击。

AI Predicted 4.3 Difficulty: Hard EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux 15d45071523d89b3fb7372e2135fbd72f6af9506< ac60717f9a8d21c58617d0b34274babf24135835 affected
15d45071523d89b3fb7372e2135fbd72f6af9506< c08192b5d6730a914dee6175bc71092ee6a65f14 affected
15d45071523d89b3fb7372e2135fbd72f6af9506< d5490dfa35427a2967e00a4c7a1b95fdbc8ede34 affected
15d45071523d89b3fb7372e2135fbd72f6af9506< 2f4f2f8f860cb4c3336a7435ebe8dcfded0c9c6e affected
15d45071523d89b3fb7372e2135fbd72f6af9506< 15006289e5c38b2a830e1fba221977a27598176c affected
15d45071523d89b3fb7372e2135fbd72f6af9506< 893387c18612bb452336a5881da0d015a7e8f4a2 affected
15d45071523d89b3fb7372e2135fbd72f6af9506< f866eef8d1c65504d30923c3f14082ad294d0e6d affected
15d45071523d89b3fb7372e2135fbd72f6af9506< 34e5667041050711a947e260fc9ebebe08bddee5 affected
… +18 more rows
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I. Basic Information for CVE-2025-40300

Vulnerability Information
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Vulnerability Title
x86/vmscape: Add conditional IBPB mitigation
Source: CVE Program / CVE List V5
Vulnerability Description
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 ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于分支预测器隔离不足，可能导致跨用户空间虚拟机攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 15d45071523d89b3fb7372e2135fbd72f6af9506 ~ ac60717f9a8d21c58617d0b34274babf24135835 -
Linux Linux 4.16 -

II. Public POCs for CVE-2025-40300

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III. Intelligence Information for CVE-2025-40300

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Same Patch Batch · Linux · 2025-09-11 · 54 CVEs total

CVE-2025-39758 9.8 CRITICAL RDMA/siw: Fix the sendmsg byte count in siw_tcp_sendpages
CVE-2025-39750 8.8 HIGH wifi: ath12k: Correct tid cleanup when tid setup fails
CVE-2025-39761 8.8 HIGH wifi: ath12k: Decrement TID on RX peer frag setup error handling
CVE-2025-39790 8.4 HIGH bus: mhi: host: Detect events pointing to unexpected TREs
CVE-2025-39791 7.8 HIGH dm: dm-crypt: Do not partially accept write BIOs with zoned targets
CVE-2025-39787 7.8 HIGH soc: qcom: mdt_loader: Ensure we don't read past the ELF header
CVE-2025-39740 7.8 HIGH drm/xe/migrate: prevent potential UAF
CVE-2025-39786 7.8 HIGH iio: adc: ad7173: fix channels index for syscalib_mode
CVE-2025-39785 7.8 HIGH drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39780 7.8 HIGH sched/ext: Fix invalid task state transitions on class switch
CVE-2025-39779 7.8 HIGH btrfs: subpage: keep TOWRITE tag until folio is cleaned
CVE-2025-39770 7.5 HIGH net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM
CVE-2025-39738 7.3 HIGH btrfs: do not allow relocation of partially dropped subvolumes
CVE-2025-39789 7.3 HIGH crypto: x86/aegis - Add missing error checks
CVE-2025-39776 7.0 HIGH mm/debug_vm_pgtable: clear page table entries at destroy_args()
CVE-2025-39744 rcu: Fix rcu_read_unlock() deadloop due to IRQ work
CVE-2025-39777 crypto: acomp - Fix CFI failure due to type punning
CVE-2025-39781 parisc: Drop WARN_ON_ONCE() from flush_cache_vmap
CVE-2025-39745 rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels
CVE-2025-39783 PCI: endpoint: Fix configfs group list head handling

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40300

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