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CVE-2026-53218— netfilter: nft_exthdr: fix register tracking for F_PRESENT flag

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nft_exthdr处理F_PRESENT标志时寄存器跟踪不足，可能导致用户控制长度大于4时寄存器保留未初始化的栈数据。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 19748967d59c31d24d21d40b728570788310b237 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 46fc15a044e9938e7ea77786fb37edd2cd74f031 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< cd513e43b4b2bd1de39e2367bc4261c699a8652f affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 67b27434c43b68a97becda98c9f0c8cf6cba2134 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 78069a6d8bc86c9e036eb82c2af4a19cc1871a53 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 affected
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783< 772cecf198da732faebb5dcfc46d66a505be8495 affected
… +10 more rows
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I. Basic Information for CVE-2026-53218

Vulnerability Information
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Vulnerability Title
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nft_exthdr处理F_PRESENT标志时寄存器跟踪不足，可能导致用户控制长度大于4时寄存器保留未初始化的栈数据。
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 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 ~ 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-53218

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III. Intelligence Information for CVE-2026-53218

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Patches & Fixes for CVE-2026-53218 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53218

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