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Review reviewHigh

CVE-2026-63917

Linux

In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). ip netns add ns1 ip netns add ns2 ip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7 ip -n ns1 link set vti6_test netns ns2 ip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9 ip netns del ns2 ip netns del ns1 [ 132.495484] ------------[ cut here ]------------ [ 132.497609] kernel BUG at net/core/dev.c:12376! Commit 61220ab34948 ("vti6: Enable namespace changing") dropped NETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then move through IF...

CVSS
8.8
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 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). ip netns add ns1 ip netns add ns2 ip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7 ip -n ns1 link set vti6_test netns ns2 ip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9 ip netns del ns2 ip netns del ns1 [ 132.495484] ------------[ cut here ]------------ [ 132.497609] kernel BUG at net/core/dev.c:12376! Commit 61220ab34948 ("vti6: Enable namespace changing") dropped NETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then move through IF...

Affected product and versions

Product
Linux
Affected versions
>= 61220ab349485d911083d0b7990ccd3db6c63297 < 0cdce7618464f7fb06f461e8f4ad575cb1d570f4, >= 61220ab349485d911083d0b7990ccd3db6c63297 < f5c68875e25f331e497ddfbe81e2d8163a87f136, >= 61220ab349485d911083d0b7990ccd3db6c63297 < d9c5eecdb3c740e65038651db7c686b10d76d1bc, >= 61220ab349485d911083d0b7990ccd3db6c63297 < f1e89a943ee574d0f2f16246eb3f2d7330fdeb03, >= 61220ab349485d911083d0b7990ccd3db6c63297 < 225b467e3b631f38be22e4b38062a1fed02fdd21, >= 61220ab349485d911083d0b7990ccd3db6c63297 < fc32be9ac2788524c6b24efd681cce7a6e731a92, >= 61220ab349485d911083d0b7990ccd3db6c63297 < ee1778ba0f5cb53be771f97017d01eb356c797bf, >= 61220ab349485d911083d0b7990ccd3db6c63297 < 11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe, >= 3.15
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:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Not available
CVE-2026-63917 — Linux | SECUFOCUS NOW