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Review reviewHigh

CVE-2025-68785

Linux

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix middle attribute validation in push_nsh() action The push_nsh() action structure looks like this: OVS_ACTION_ATTR_PUSH_NSH(OVS_KEY_ATTR_NSH(OVS_NSH_KEY_ATTR_BASE,...)) The outermost OVS_ACTION_ATTR_PUSH_NSH attribute is OK'ed by the nla_for_each_nested() inside __ovs_nla_copy_actions(). The innermost OVS_NSH_KEY_ATTR_BASE/MD1/MD2 are OK'ed by the nla_for_each_nested() inside nsh_key_put_from_nlattr(). But nothing checks if the attribute in the middle is OK. We don't even check that this attribute is th...

CVSS
7.1
EPSS
0.13%
3.20% percentile
CISA KEV
Not listed
Published
2026.01.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix middle attribute validation in push_nsh() action The push_nsh() action structure looks like this: OVS_ACTION_ATTR_PUSH_NSH(OVS_KEY_ATTR_NSH(OVS_NSH_KEY_ATTR_BASE,...)) The outermost OVS_ACTION_ATTR_PUSH_NSH attribute is OK'ed by the nla_for_each_nested() inside __ovs_nla_copy_actions(). The innermost OVS_NSH_KEY_ATTR_BASE/MD1/MD2 are OK'ed by the nla_for_each_nested() inside nsh_key_put_from_nlattr(). But nothing checks if the attribute in the middle is OK. We don't even check that this attribute is th...

Affected product and versions

Product
Linux
Affected versions
>= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < d0c135b8bbbcf92836068fd395bebeb7ae6c7bef, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < 3bc2efff20a38b2c7ca18317649715df0dd62ced, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < 1b569db9c2f28b599e40050524aae5f7332bc294, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < 10ffc558246f2c75619aedda0921906095e46702, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < 2ecfc4433acdb149eafd7fb22d7fd4adf90b25e9, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < c999153bfb2d1d9b295b7010d920f2a7c6d7595f, >= b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3 < 5ace7ef87f059d68b5f50837ef3e8a1a4870c36e, >= 4.15
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:U/C:H/I:N/A:H
CWE
Not available