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CVE-2026-31628— x86/CPU: Fix FPDSS on Zen1

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Zen1硬件除法器在特定情况下可能泄露先前操作的部分结果，导致攻击者线程可以获取这些结果。

AI Predicted 5.3 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< 0548529af20e68c6552817834b766646dd3bd7a7 affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< 1272cfedf4cd1019ddf583917a99b62f2d3645bb affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< 91f02726b2203b71545713ecb7fb006e60a2d66f affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< b731aca06387b195058a9f6449a03b62efa1bd10 affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< ad17f07e95e6e8505e2153e5b391f0d27eacce25 affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< e6af5286efe5a56128b34032572c9ce9ebeccda3 affected
f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9< 546785c719418c6166834a47e372a88f5f7ae893 affected
… +18 more rows
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I. Basic Information for CVE-2026-31628

Vulnerability Information
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Vulnerability Title
x86/CPU: Fix FPDSS on Zen1
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread. Fix that with a chicken bit.
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Zen1硬件除法器在特定情况下可能泄露先前操作的部分结果，导致攻击者线程可以获取这些结果。
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 f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 ~ ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 -
Linux Linux 4.14 -

II. Public POCs for CVE-2026-31628

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III. Intelligence Information for CVE-2026-31628

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Patches & Fixes for CVE-2026-31628 (1)

Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31669 9.8 CRITICAL mptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-31668 9.8 CRITICAL seg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31659 9.8 CRITICAL batman-adv: reject oversized global TT response buffers
CVE-2026-31636 9.1 CRITICAL rxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31622 8.8 HIGH NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-31558 8.8 HIGH LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-31553 8.8 HIGH KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-31588 8.8 HIGH KVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-31611 8.6 HIGH ksmbd: require 3 sub-authorities before reading sub_auth[2]

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31628

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