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CVE-2026-53221— ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

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vti6_tnl_lookup()中的隧道匹配问题，回退搜索循环未能检查候选隧道是否具有通配符地址，可能导致哈希冲突。

CVSS 9.8 · Critical EPSS 0.51% · P42

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< c327fa4fca31415431202e063767a7ae342e19c6 affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< fc657ac0767c49839b3ef0b08dc0953ca30883f8 affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< 47fb3c2b4203556308e64354b3e78f2ce221d646 affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< f513f308cc4bdb4530d033431592ffbc29b7fca1 affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< 90fd4513315ca07da99cfd8549d3e553a7160f0d affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< 2abfb19bbb81958714ad1d43ebeb65b30394184b affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d affected
fbe68ee87522f6eaa10f9076c0a7117e1613f2f7< a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 affected
… +10 more rows
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I. Basic Information for CVE-2026-53221

Vulnerability Information
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Vulnerability Title
ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup() In vti6_tnl_lookup(), when an exact match for a tunnel fails, the code falls back to searching for wildcard tunnels: - Tunnels matching the packet's local address, with any remote address wildcard remote). - Tunnels matching the packet's remote address, with any local address (wildcard local). However, vti6 stores all these different types of tunnels in the same hash table (ip6n->tnls_r_l) prone to hash collisions. The bug is that the fallback search loops in vti6_tnl_lookup() were missing checks to ensure that the candidate tunnel actually has a wildcard address.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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vti6_tnl_lookup()中的隧道匹配问题，回退搜索循环未能检查候选隧道是否具有通配符地址，可能导致哈希冲突。
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 fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 ~ c327fa4fca31415431202e063767a7ae342e19c6 -
Linux Linux 3.19 -

II. Public POCs for CVE-2026-53221

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III. Intelligence Information for CVE-2026-53221

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Patches & Fixes for CVE-2026-53221 (8)

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

CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
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-2026-53216 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-2026-53215 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-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53198 8.8 HIGH ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53275 8.8 HIGH ipv6: mcast: Fix use-after-free when processing MLD queries

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-2026-53221

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