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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < c7e8971abd70e9d022f1c251ba2508f8dc7f2db8; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < 09cbfd4b81ae90963dadb1de99b63b702e73290a; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < 1dca7e491f070ac49b3d934f16ee953a53b37f38; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < 902daac307eb7e1955ce05b071950f3cba88c963; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < abdd03229414b5a52943b65a60f34b84cea5ac59; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < cf75eb6617042c8cff6112daeed7791809fc9dd2; >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0, < d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9 |
| Linux | Linux | 5.15 |
References
- https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290aPatch
- https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38Patch
- https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963Patch
- https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59Patch
- https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8Patch
- https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2Patch
- https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9Patch
Timeline
- Published
- Jul 19, 2026
- Last modified
- Aug 12, 2026
- NVD status
- Analyzed