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CVE-2026-64116— ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()

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 5.15版本存在安全漏洞，该漏洞源于ipv6_hop_ioam函数在访问__in6_dev_get(skb->dev)->cnf.ioam6_enabled时未验证返回的idev指针，可能导致在处理IOAM逐跳选项时触发空指针取消引用。

CVSS 7.5 · High EPSS 0.51% · P42

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< c7e8971abd70e9d022f1c251ba2508f8dc7f2db8 affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< 09cbfd4b81ae90963dadb1de99b63b702e73290a affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< 1dca7e491f070ac49b3d934f16ee953a53b37f38 affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< 902daac307eb7e1955ce05b071950f3cba88c963 affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< abdd03229414b5a52943b65a60f34b84cea5ac59 affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< cf75eb6617042c8cff6112daeed7791809fc9dd2 affected
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0< d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-64116

Vulnerability Information
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Vulnerability Title
ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: ioam: add NULL check for idev in ipv6_hop_ioam() Reported by Sashiko: The function ipv6_hop_ioam() accesses __in6_dev_get(skb->dev)->cnf.ioam6_enabled without validating the returned idev pointer. Because addrconf_ifdown() can concurrently clear dev->ip6_ptr via RCU, __in6_dev_get() can return NULL during interface teardown, which could cause a NULL pointer dereference when processing an IOAM Hop-by-Hop option. Let's add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 5.15版本存在安全漏洞，该漏洞源于ipv6_hop_ioam函数在访问__in6_dev_get(skb->dev)->cnf.ioam6_enabled时未验证返回的idev指针，可能导致在处理IOAM逐跳选项时触发空指针取消引用。
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 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 ~ c7e8971abd70e9d022f1c251ba2508f8dc7f2db8 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-64116

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III. Intelligence Information for CVE-2026-64116

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Patches & Fixes for CVE-2026-64116 (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-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63994 9.8 CRITICAL tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()

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-2026-64116

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