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CVE-2026-53212— netfilter: nft_tunnel: fix use-after-free on object destroy

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 4.19及之前版本存在安全漏洞，该漏洞源于nft_tunnel对象销毁时的释放后重用问题，可能导致攻击者利用悬空指针操作释放的内存。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux af308b94a2a4a5a27bec9028354c4df444a7c8ba< 349df61526d2e39decc685d246202e3e284cfe05 affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< 55b79b1ae42372012413ce0413181d26679b17ef affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< 5e9ee18b27fde88cb6148202b33916c66693fe82 affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< 8767fe4079affa74314d7eb3220e700150289842 affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< fda6573a46ad24f35348e024905ee5bdf729797e affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< f9a0e4b61054cde89a2a77845293c726cc07cc43 affected
af308b94a2a4a5a27bec9028354c4df444a7c8ba< c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a affected
… +10 more rows
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I. Basic Information for CVE-2026-53212

Vulnerability Information
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Vulnerability Title
netfilter: nft_tunnel: fix use-after-free on object destroy
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory. Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 4.19及之前版本存在安全漏洞，该漏洞源于nft_tunnel对象销毁时的释放后重用问题，可能导致攻击者利用悬空指针操作释放的内存。
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 af308b94a2a4a5a27bec9028354c4df444a7c8ba ~ 349df61526d2e39decc685d246202e3e284cfe05 -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-53212

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III. Intelligence Information for CVE-2026-53212

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Patches & Fixes for CVE-2026-53212 (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-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
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-2026-53246 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-2026-53151 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-2026-53216 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-2026-53131 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-2026-53186 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-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53200 8.8 HIGH KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53277 8.8 HIGH KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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