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CVE-2024-50102— x86: fix user address masking non-canonical speculation issue

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x86模块在处理非规范地址推测时未能正确处理用户地址掩码，可能导致泄漏推测数据。

AI Predicted 7.5 Difficulty: Hard EPSS 0.24% · P14

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux b19b74bc99b1501a550f4448d04d59b946dc617a< 291313693677a345d4f50aae3c68e28b469f601e affected
b19b74bc99b1501a550f4448d04d59b946dc617a< 86e6b1547b3d013bc392adf775b89318441403c2 affected
6.4 affected
< 6.4 unaffected
6.11.6≤ 6.11.* unaffected
6.12≤ * unaffected
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I. Basic Information for CVE-2024-50102

Vulnerability Information
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Vulnerability Title
x86: fix user address masking non-canonical speculation issue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86: fix user address masking non-canonical speculation issue It turns out that AMD has a "Meltdown Lite(tm)" issue with non-canonical accesses in kernel space. And so using just the high bit to decide whether an access is in user space or kernel space ends up with the good old "leak speculative data" if you have the right gadget using the result: CVE-2020-12965 “Transient Execution of Non-Canonical Accesses“ Now, the kernel surrounds the access with a STAC/CLAC pair, and those instructions end up serializing execution on older Zen architectures, which closes the speculation window. But that was true only up until Zen 5, which renames the AC bit [1]. That improves performance of STAC/CLAC a lot, but also means that the speculation window is now open. Note that this affects not just the new address masking, but also the regular valid_user_address() check used by access_ok(), and the asm version of the sign bit check in the get_user() helpers. It does not affect put_user() or clear_user() variants, since there's no speculative result to be used in a gadget for those operations.
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x86模块在处理非规范地址推测时未能正确处理用户地址掩码，可能导致泄漏推测数据。
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 b19b74bc99b1501a550f4448d04d59b946dc617a ~ 291313693677a345d4f50aae3c68e28b469f601e -
Linux Linux 6.4 -

II. Public POCs for CVE-2024-50102

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III. Intelligence Information for CVE-2024-50102

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Patches & Fixes for CVE-2024-50102 (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-2024-50115 8.4 HIGH KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory
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-2023-52920 7.8 HIGH bpf: support non-r10 register spill/fill to/from stack in precision tracking
CVE-2024-50091 7.8 HIGH dm vdo: don't refer to dedupe_context after releasing it
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-2024-50094 7.5 HIGH sfc: Don't invoke xdp_do_flush() from netpoll.
CVE-2024-50095 7.5 HIGH RDMA/mad: Improve handling of timed out WRs of mad agent
CVE-2024-50096 7.3 HIGH nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error
CVE-2024-50117 7.3 HIGH drm/amd: Guard against bad data for ATIF ACPI method
CVE-2024-50099 7.3 HIGH arm64: probes: Remove broken LDR (literal) uprobe support

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-2024-50102

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