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Review reviewHigh

CVE-2026-64116

Linux

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.

CVSS
7.5
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.5

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < c7e8971abd70e9d022f1c251ba2508f8dc7f2db8, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 09cbfd4b81ae90963dadb1de99b63b702e73290a, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 1dca7e491f070ac49b3d934f16ee953a53b37f38, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 902daac307eb7e1955ce05b071950f3cba88c963, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < abdd03229414b5a52943b65a60f34b84cea5ac59, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < cf75eb6617042c8cff6112daeed7791809fc9dd2, >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9, >= 5.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available
CVE-2026-64116 — Linux | SECUFOCUS NOW