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CVE-2026-43089— xfrm_user: fix info leak in build_mapping()

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_mapping函数中struct xfrm_usersa_id的proto字段后存在1字节填充空洞未清零，导致信息泄露。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< 521385cbd50ca9474396d88462fcdfa6489685d9 affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< d3125c541a96fb3c0fc7210112684baf22b6c24d affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< 5a1a4b049ddde41466ccac0daeec326254b133f2 affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< 700c9622b23c33b5933e6dcea816492c064e4e10 affected
3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4< 1beb76b2053b68c491b78370794b8ff63c8f8c02 affected
… +10 more rows
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I. Basic Information for CVE-2026-43089

Vulnerability Information
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Vulnerability Title
xfrm_user: fix info leak in build_mapping()
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_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual 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_mapping函数中struct xfrm_usersa_id的proto字段后存在1字节填充空洞未清零，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 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 ~ 521385cbd50ca9474396d88462fcdfa6489685d9 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-43089

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III. Intelligence Information for CVE-2026-43089

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Patches & Fixes for CVE-2026-43089 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-43208 9.8 CRITICAL net: do not pass flow_id to set_rps_cpu()
CVE-2026-43125 9.8 CRITICAL dlm: validate length in dlm_search_rsb_tree
CVE-2026-43198 9.8 CRITICAL tcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-43186 9.8 CRITICAL ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-43185 9.8 CRITICAL ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-43114 9.4 CRITICAL netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-43117 9.1 CRITICAL btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43239 8.8 HIGH smb: client: prevent races in ->query_interfaces()
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43187 8.8 HIGH xfs: delete attr leaf freemap entries when empty

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43089

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