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CVE-2026-43085— netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

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nfnetlink_log中NLMSG_DONE终止符的nfgenmsg载荷未初始化，导致内核堆数据泄露。

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P6

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 296f18e1c3a87c915a92ed27832d5040a22d1072 affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 9e2182865de781c41ab16b7985e9d26dcefea867 affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 57cc509d82b46150a11dcecc8b25eaa177eda34d affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 368c22aea490f6f50df831b4f9e3623787686c5b affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< d1399632ba255d2e02c757af5d9f5d9279ce168c affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< d552bcfca323d175664d7444989b04f55666978a affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c affected
29c5d4afba51c71cfeadd3f74f3c42e064483fb0< 1f3083aec8836213da441270cdb1ab612dd82cf4 affected
… +10 more rows
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I. Basic Information for CVE-2026-43085

Vulnerability Information
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Vulnerability Title
netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.
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nfnetlink_log中NLMSG_DONE终止符的nfgenmsg载荷未初始化，导致内核堆数据泄露。
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 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 ~ 296f18e1c3a87c915a92ed27832d5040a22d1072 -
Linux Linux 2.6.23 -

II. Public POCs for CVE-2026-43085

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III. Intelligence Information for CVE-2026-43085

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Patches & Fixes for CVE-2026-43085 (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-2026-43085

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