What’s Vulnerable › Vulnerabilities

CVE-2026-43101: ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-10-30
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data() We need to check __in6_dev_get() for possible NULL value, as suggested by Yiming Qian. Also add skb_dst_dev_rcu() instead of skb_dst_dev(), and two missing READ_ONCE(). Note that @dev can't be NULL.

Affected products

• Linux kernel: from 5.15 before 6.18.24; from 6.19 before 6.19.14; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5, 7.0-rc6 (+1) — fixed in 6.18.24, 6.19.14
• Linux: 5.15 — fixed in 7.0

How to fix

Upgrade to a fixed version: Linux kernel 6.18.24, 6.19.14; Linux 7.0. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/34b8390ac0ba57004b90ea568ac06f50bf896a80
• https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6
• https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7
• https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b
• https://git.kernel.org/stable/c/dd0d2827b3643ff307c766865f8e31eab5cbd1f5
• https://git.kernel.org/stable/c/f87aa5d1a7f56727a768757613a303b4245444a1

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