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CVE-2026-63922— ipv6: exthdrs: refresh nh after handling HAO option

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基金会开源的一款操作系统内核。 Linux kernel 2.6.19版本存在安全漏洞，该漏洞源于在IPv6扩展头处理中，ip6_parse_tlv()函数缓存网络头部指针，但ipv6_dest_hao()可能调用pskb_expand_head()移动skb头部并导致缓存指针失效，从而可能引发越界读取或其他异常。

CVSS 9.8 · Critical EPSS 0.71% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a831f5bbc89a9978795504be9e1ff412043f8f77< b3ac54e5c905f86d22b502eacb5686a282c5659f affected
a831f5bbc89a9978795504be9e1ff412043f8f77< f8aabed3ff3e986920cf02a2a2785e08e586b234 affected
a831f5bbc89a9978795504be9e1ff412043f8f77< 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 affected
a831f5bbc89a9978795504be9e1ff412043f8f77< 12d957979e4a800167842f1b42be6a606d227ebe affected
a831f5bbc89a9978795504be9e1ff412043f8f77< ff375ed1cba81392346c5bfbf0bb7a13b2946f99 affected
a831f5bbc89a9978795504be9e1ff412043f8f77< 751db1b802a067b7fff25880f4e9f9152a171538 affected
a831f5bbc89a9978795504be9e1ff412043f8f77< 9b6dcc0a39fd71752937f0b6b3973e1416085dcf affected
a831f5bbc89a9978795504be9e1ff412043f8f77< f7b52afe3592eae66e160586b45a3f2242972c63 affected
… +10 more rows
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I. Basic Information for CVE-2026-63922

Vulnerability Information
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Vulnerability Title
ipv6: exthdrs: refresh nh after handling HAO option
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.
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基金会开源的一款操作系统内核。 Linux kernel 2.6.19版本存在安全漏洞，该漏洞源于在IPv6扩展头处理中，ip6_parse_tlv()函数缓存网络头部指针，但ipv6_dest_hao()可能调用pskb_expand_head()移动skb头部并导致缓存指针失效，从而可能引发越界读取或其他异常。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a831f5bbc89a9978795504be9e1ff412043f8f77 ~ b3ac54e5c905f86d22b502eacb5686a282c5659f -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-63922

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III. Intelligence Information for CVE-2026-63922

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Patches & Fixes for CVE-2026-63922 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63922

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