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CVE-2026-53228— ipv6: sit: reload inner IPv6 header after GSO offloads

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IPv6 SIT隧道函数ipip6_tunnel_xmit()在处理GSO分片时未重新加载内部IPv6头部指针，可能导致从已释放的skb头部读取数据。

CVSS 9.8 · Critical EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab< fddd41445a0537b093e6b3f6232c9933cad1e48b affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< 1132e5edc2866c3530be17622153a597095f0e43 affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< 9c67b44edb3598d234efae6e44649eb993c03da5 affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< 0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< 59f80c919713250fe5d25a4d9aea4e49580fa1d4 affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< 2fa49b2715e1bad12ce3b0fa64e234d9582c8193 affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c affected
14909664e4e192f4c6f6fcdccd9919af7cf783ab< f0e42f0c4337b1f220de1ddd63f47197c7dee4de affected
… +10 more rows
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I. Basic Information for CVE-2026-53228

Vulnerability Information
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Vulnerability Title
ipv6: sit: reload inner IPv6 header after GSO offloads
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: sit: reload inner IPv6 header after GSO offloads ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnel_handle_offloads(). For GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(), which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be reloaded after the call. If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's remaining clone is released. Reload iph6 after the offload helper succeeds and before subsequent reads from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can also replace the skb.
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IPv6 SIT隧道函数ipip6_tunnel_xmit()在处理GSO分片时未重新加载内部IPv6头部指针，可能导致从已释放的skb头部读取数据。
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 14909664e4e192f4c6f6fcdccd9919af7cf783ab ~ fddd41445a0537b093e6b3f6232c9933cad1e48b -
Linux Linux 3.18 -

II. Public POCs for CVE-2026-53228

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III. Intelligence Information for CVE-2026-53228

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Patches & Fixes for CVE-2026-53228 (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-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
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-2026-53151 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-2026-53277 8.8 HIGH KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
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-2026-53228

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