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CVE-2026-31671— xfrm_user: fix info leak in build_report()

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build_report函数中结构体填充字节未清零，可能导致信息泄露。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1435

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< d27c02eec529f78055a46a5c9e6c62684382b2d8 affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< 716c546e88cfe49d841658240e10cb57bc50a2cc affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< 0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9 affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< e0c8542c3d097ed4205ded51868195d5d6ddac62 affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< ff5ee507302303b15859753c3e0d67d38fd12c88 affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< 6c55714c931051cd7f4839c19ce0867179fd22fe affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< 0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72 affected
97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5< d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 affected
… +10 more rows
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I. Basic Information for CVE-2026-31671

Vulnerability Information
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Vulnerability Title
xfrm_user: fix info leak in build_report()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_report() struct xfrm_user_report is a __u8 proto field followed by a struct xfrm_selector which means there is three "empty" bytes of padding, but the padding is never zeroed before copying to userspace. Fix that up by zeroing the structure before setting individual member variables.
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build_report函数中结构体填充字节未清零，可能导致信息泄露。
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 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 ~ d27c02eec529f78055a46a5c9e6c62684382b2d8 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-31671

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III. Intelligence Information for CVE-2026-31671

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

CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
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-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
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-2026-31622 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-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
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-2026-31671

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