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CVE-2024-50115— KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory

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KVM模块在加载嵌套SVM的PDPTEs时未能正确处理CR3寄存器的高5位，可能导致越界读取。

CVSS 8.4 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux e4e517b4be019787ada4cbbce2f04570c21b0cbd< 76ce386feb14ec9a460784fcd495d8432acce7a5 affected
e4e517b4be019787ada4cbbce2f04570c21b0cbd< 58cb697d80e669c56197f703e188867c8c54c494 affected
e4e517b4be019787ada4cbbce2f04570c21b0cbd< 6876793907cbe19d42e9edc8c3315a21e06c32ae affected
e4e517b4be019787ada4cbbce2f04570c21b0cbd< 2c4adc9b192a0815fe58a62bc0709449416cc884 affected
e4e517b4be019787ada4cbbce2f04570c21b0cbd< 426682afec71ea3f889b972d038238807b9443e4 affected
e4e517b4be019787ada4cbbce2f04570c21b0cbd< f559b2e9c5c5308850544ab59396b7d53cfc67bd affected
3.2 affected
< 3.2 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-50115

Vulnerability Information
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Vulnerability Title
KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory Ignore nCR3[4:0] when loading PDPTEs from memory for nested SVM, as bits 4:0 of CR3 are ignored when PAE paging is used, and thus VMRUN doesn't enforce 32-byte alignment of nCR3. In the absolute worst case scenario, failure to ignore bits 4:0 can result in an out-of-bounds read, e.g. if the target page is at the end of a memslot, and the VMM isn't using guard pages. Per the APM: The CR3 register points to the base address of the page-directory-pointer table. The page-directory-pointer table is aligned on a 32-byte boundary, with the low 5 address bits 4:0 assumed to be 0. And the SDM's much more explicit: 4:0 Ignored Note, KVM gets this right when loading PDPTRs, it's only the nSVM flow that is broken.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
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KVM模块在加载嵌套SVM的PDPTEs时未能正确处理CR3寄存器的高5位，可能导致越界读取。
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 e4e517b4be019787ada4cbbce2f04570c21b0cbd ~ 76ce386feb14ec9a460784fcd495d8432acce7a5 -
Linux Linux 3.2 -

II. Public POCs for CVE-2024-50115

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III. Intelligence Information for CVE-2024-50115

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Patches & Fixes for CVE-2024-50115 (2)

Same Patch Batch · Linux · 2024-11-05 · 50 CVEs total

CVE-2024-50106 9.8 CRITICAL nfsd: fix race between laundromat and free_stateid
CVE-2024-50113 8.8 HIGH firewire: core: fix invalid port index for parent device
CVE-2024-50125 8.0 HIGH Bluetooth: SCO: Fix UAF on sco_sock_timeout
CVE-2024-50124 8.0 HIGH Bluetooth: ISO: Fix UAF on iso_sock_timeout
CVE-2024-50132 7.8 HIGH tracing/probes: Fix MAX_TRACE_ARGS limit handling
CVE-2024-50091 7.8 HIGH dm vdo: don't refer to dedupe_context after releasing it
CVE-2023-52920 7.8 HIGH bpf: support non-r10 register spill/fill to/from stack in precision tracking
CVE-2024-50101 7.8 HIGH iommu/vt-d: Fix incorrect pci_for_each_dma_alias() for non-PCI devices
CVE-2024-50114 7.8 HIGH KVM: arm64: Unregister redistributor for failed vCPU creation
CVE-2024-50127 7.8 HIGH net: sched: fix use-after-free in taprio_change()
CVE-2024-50126 7.8 HIGH net: sched: use RCU read-side critical section in taprio_dump()
CVE-2024-50128 7.8 HIGH net: wwan: fix global oob in wwan_rtnl_policy
CVE-2024-50130 7.8 HIGH netfilter: bpf: must hold reference on net namespace
CVE-2024-50090 7.8 HIGH drm/xe/oa: Fix overflow in oa batch buffer
CVE-2024-50095 7.5 HIGH RDMA/mad: Improve handling of timed out WRs of mad agent
CVE-2024-50094 7.5 HIGH sfc: Don't invoke xdp_do_flush() from netpoll.
CVE-2024-50131 7.3 HIGH tracing: Consider the NULL character when validating the event length
CVE-2024-50096 7.3 HIGH nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error
CVE-2024-50099 7.3 HIGH arm64: probes: Remove broken LDR (literal) uprobe support
CVE-2024-50117 7.3 HIGH drm/amd: Guard against bad data for ATIF ACPI method

Showing top 20 of 50 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50115

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